JPH09117787A - Aerator - Google Patents
AeratorInfo
- Publication number
- JPH09117787A JPH09117787A JP7299033A JP29903395A JPH09117787A JP H09117787 A JPH09117787 A JP H09117787A JP 7299033 A JP7299033 A JP 7299033A JP 29903395 A JP29903395 A JP 29903395A JP H09117787 A JPH09117787 A JP H09117787A
- Authority
- JP
- Japan
- Prior art keywords
- floating island
- vegetation
- pipe
- air
- water
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W10/00—Technologies for wastewater treatment
- Y02W10/10—Biological treatment of water, waste water, or sewage
Landscapes
- Hydroponics (AREA)
- Aeration Devices For Treatment Of Activated Polluted Sludge (AREA)
- Purification Treatments By Anaerobic Or Anaerobic And Aerobic Bacteria Or Animals (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】曝気装置および植生浮島を用
いダム湖沼等の水質改善と自然景観・環境の保護を行な
う装置に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a device for improving water quality in dam lakes and marshes and protecting natural landscapes and environments using an aeration device and vegetation floating islands.
【０００２】[0002]
【従来の技術】従来ダム湖沼等の溶存酸素不足状態や嫌
気状態の水質改善は曝気装置で行い、また自然景観の復
旧向上や野鳥保護のための休息地域は魚類増殖のための
産卵場所又は植生植物による栄養塩の吸収による水質の
浄化等は植生浮島を設置する事で改善するというよう
に、別々の施設として設置されてきた。2. Description of the Related Art Conventionally, water quality improvement of dissolved oxygen deficiency and anaerobic conditions in dam lakes and marshes is performed by aeration equipment, and a resting area for improving natural landscape restoration and wild bird protection is a spawning site for vegetation or vegetation. Water purification by absorption of nutrients by plants has been improved by installing vegetation floating islands, and they have been installed as separate facilities.
【０００３】[0003]
【発明が解決しようとする課題】水中に散気装置を備え
た曝気装置は、散気装置が沈錘による水底設置式のもの
であれば、その直上に点検手入用の浮体、或いはは吊り
下げ形式のものであれば吊り下げ用の浮体が必要であ
り、自然景観と不釣合な人工の浮体が浮ぶことになる。
それが数基ともなるとなおさらである。An aeration device provided with an air diffusing device in the water is a floating body for inspection and maintenance or a hanging device just above the diffusing device if the diffusing device is of a water bottom installation type by a sinker. If it is a hanging type, a floating body for hanging is required, and an artificial floating body that is unbalanced with the natural landscape will float.
Especially when it becomes several.
【０００４】また植生浮島はその場所の日光を遮り、植
物性プランクトン、引いては動物性プランクトンの増殖
がさまたげられ、せっかく集まって来た魚類の餌が不足
勝になる。また植生のヨシやアシは水中の栄養塩のＰ，
Ｎを吸収するので、これらを栄養源とする植物プランク
トン、引いては動物プランクトンの増殖はある程度抑制
される。また、ダム湖沼は水流は殆んどなく、浮島は静
止した水に浮いて係留固定されており、植生浮島に植生
された水生植物が吸収する栄養塩の量は限られている。In addition, the vegetation floating island blocks the sunlight in the area, and the growth of phytoplankton and eventually zooplankton is interrupted, resulting in a shortage of food for the gathered fish. In addition, reeds and reeds of vegetation are P of nutrient salts in water,
Since N is absorbed, the growth of phytoplankton and zooplankton, which use these as nutrient sources, is suppressed to some extent. In addition, the dam lake has almost no water flow, and the floating island floats in stationary water and is fixed by mooring, and the amount of nutrients absorbed by the aquatic plants vegetated on the floating island is limited.
【０００５】本発明は曝気装置と植生浮島が別々に設置
されていた上記従来技術の欠点を解消し、曝気装置を植
生浮島の直下に設置して、曝気装置専用の浮体は設置せ
ず、植生浮島を浮体として兼用することにより積極的に
水流を当て植生植物の毛根に水流が当り栄養塩の吸収を
促進させると共に曝気装置の散気孔よりの気泡により集
魚し、曝気効果により溶存酸素が多く、産卵場所となる
植生浮島の植生の毛根に酸素を多く含んだ水流をあて、
餌となる動物性プランクトンが豊富に存在する環境を造
出しようとするものである。The present invention solves the above-mentioned drawbacks of the prior art in which the aeration device and the vegetation floating island are separately installed, and the aeration device is installed directly under the vegetation floating island, and the floating body dedicated to the aeration device is not installed. By using the floating island also as a floating body, the water flow is positively applied to the hair roots of vegetation plants to accelerate the absorption of nutrients and the air bubbles from the aeration holes of the aerator collect fish, resulting in a large amount of dissolved oxygen. Vegetation, which will be the spawning site, applies a stream of oxygen-rich water to the roots of the floating island vegetation,
It seeks to create an environment rich in zooplankton for food.
【０００６】[0006]
【課題を解決するための手段】この目的を達成するた
め、本発明では、植生浮島の下方水中に散気装置を設
け、曝気上昇流が浮島下面に当るようにし、植生浮島を
散気装置の点検用浮体或いは散気装置の吊り下げ用浮体
として兼用した曝気装置である。In order to achieve this object, in the present invention, an air diffuser is provided in the water below the vegetation floating island so that the aeration upward flow strikes the bottom surface of the floating island and the vegetation floating island It is an aerator that doubles as a floating body for inspection or a floating body for suspending an air diffuser.
【０００７】上記曝気装置において、植生浮島の周り
に、アシ、ヨシやホテイアオイ等の水生植物の植生域を
設けてもよい。In the above aeration apparatus, a vegetation area for aquatic plants such as reeds, reeds and water hyacinths may be provided around the vegetation floating island.
【０００８】また、植生浮島の下面中央に集気用空間を
設け、外気に通じる排気管を浮島を貫通するように設け
てもよい。Further, a space for collecting air may be provided in the center of the lower surface of the vegetation floating island, and an exhaust pipe communicating with the outside air may be provided so as to penetrate the floating island.
【０００９】また、植生浮島を環状浮島としてもよい。Further, the vegetation floating island may be an annular floating island.
【００１０】また、曝気装置の散気管を、吐出孔を多数
穿設した水平リング管と、水平リング管中央に位置し送
気管を接続したヘッダと、ヘッダより分岐し水平リング
管の等分位置に接続した複数本の枝管と水平リング管の
各枝管接続位置の中間に挿入した盲板とよりなる散気管
としてもよい。Further, the air diffuser of the aeration device is provided with a horizontal ring pipe having a large number of discharge holes, a header which is located at the center of the horizontal ring pipe and which is connected to an air supply pipe, and a branch from the header that divides the horizontal ring pipe into equal parts. An air diffusing tube may be formed by a plurality of branch pipes connected to each other and a blind plate inserted in the middle of each branch pipe connecting position of the horizontal ring pipe.
【００１１】また、曝気装置を、下端に複数本の枝索を
有し該枝索で散気管を支持した吊り索の上端を浮島上の
ウインチに巻き取って巻き揚げ巻き降し自在に支持する
と共に浮島上の複数個のオートテンションウインチに上
端を巻き取った複数本の回転防止索の下端により散気管
を支持し、送気管を吊り索に上下動自在に添わすガイド
金物を、吊り索をパイプ内に挿入したガイドパイプと、
送気管の所定位置に所定間隔で固定した固定部と、一端
を固定部に回動自在に水平ピン結合し他端をガイドパイ
プに固定した回動部とよりなり、散気管吊り索をウイン
チにより巻き揚げた時送気管が吊り索中心に連続Ｓ字状
に屈曲すると共に回転防止索の余長をオートテンション
ウインチにより巻き取るようにしてもよい。Further, the aeration device has a plurality of branch lines at its lower end and supports the diffusing pipe by the branch lines so that the upper end of the suspension line is wound around a winch on a floating island and can be hoisted and unwound. Along with the multiple auto-tension winches on the floating island, the lower ends of the multiple anti-rotation cords that are wound around the upper end support the air diffuser pipe, and the guide hardware that vertically attaches the air supply pipe to the suspension cord is attached to the suspension cord. A guide pipe inserted in the pipe,
It consists of a fixed part fixed at a predetermined position of the air supply pipe at a predetermined interval, and a rotating part in which one end is rotatably connected to the fixed part by a horizontal pin and the other end is fixed to a guide pipe. The air supply pipe may be bent in a continuous S-shape around the center of the hanging rope when wound up, and the extra length of the anti-rotation rope may be wound up by an auto-tension winch.
【００１２】また、植生浮島を、浮島の平面形状に形成
した枠体と、枠体を水面に対し所定の位置に支持する浮
体と、散気管吊り索を巻き取り支持した枠体上に取り付
けたウインチと、複数本の散気管回転防止索の各上端部
を巻き取り枠体上に取り付けた同数のオートテンション
ウインチと、枠体上に配置し各ウインチ間を埋めるよう
に配置した植生基盤材とよりなる植生浮島としてもよ
い。Further, the vegetation floating island was mounted on a frame body formed in a plane shape of the floating island, a floating body for supporting the frame body at a predetermined position with respect to the water surface, and a frame body for winding and supporting the air diffusing pipe hanging rope. A winch, an equal number of auto-tension winches in which the upper ends of a plurality of air diffusing tube rotation prevention cords are mounted on the frame body, and a vegetation base material arranged on the frame body so as to fill between the winches. It may be a vegetation floating island.
【００１３】[0013]
【作用】曝気装置の散気管から曝気用圧縮空気を水中に
放出すると気泡は回りの水に酸素を与えつつ上昇し水圧
に応じて膨張し大気に合流する。また、気泡が上昇する
時水に上昇エネルギーを与えるため栄養塩に富んだ中層
・深層よりの上昇水流が発生し、浮島に当り拡散し四方
にゆっくりした拡散流を形成する。この溶存酸素を多く
含んだ栄養塩に富んだゆっくりした拡散流は浮島周縁部
の植生植物に適宜な水流を与え、水中の栄養塩の吸収を
良好にならしめる。また、植物性プランクトン、ひいて
は動物性プランクトンの発生もうながし、浮島の周縁部
には魚類の餌となる動物性プランクトンが豊富になり、
曝気により溶存酸素が多い拡散流中で、散気管よりの気
泡を目あてに集まった魚類に、産卵場所となる浮島周縁
部の水生植物の毛根にゆったりとした拡散流が当り、卵
への酸素の供給を充分に行い、魚類の良好な生息環境を
造出する。When the compressed air for aeration is discharged into the water from the air diffuser of the aeration device, the bubbles rise while giving oxygen to the surrounding water, expand according to the water pressure and join the atmosphere. In addition, as the bubbles rise, the rising energy is given to the water, so that a rising water flow from the middle and deep layers rich in nutrient salts is generated, and it hits the floating island and diffuses to form a slow diffusive flow in all directions. The slow diffusion flow rich in nutrients containing a large amount of dissolved oxygen gives a proper flow of water to the vegetation plants around the floating islands, and promotes absorption of nutrients in the water. In addition, phytoplankton and eventually zooplankton are likely to be generated, and zooplankton, which is a food for fish, becomes rich in the periphery of the floating island.
In a diffuse flow with a large amount of dissolved oxygen due to aeration, fish that gathered toward air bubbles from the diffuser tube hit the hairy roots of aquatic plants around the floating island where spawning occurs, and the oxygen to the eggs To provide a good habitat for fish.
【００１４】また、植生浮島の周縁部の水辺の汀部はア
シ、ヨシ等の水生植物が植生されるが、汀部を拡げ、浮
島の周りに水生植物植生域を設ければ、ゆったりとした
拡散流が毛根に当ることにより栄養塩を吸収して充分繁
茂する。Vegetation In the waterside shore of the floating island, aquatic plants such as reeds and reeds are vegetated. However, if the shore is expanded and an aquatic plant vegetation area is provided around the floating island, it will be relaxed. When the diffusive flow hits the hair root, it absorbs nutrient salts and flourishes.
【００１５】また、植生浮島の下面には散気管よりの大
量の気泡が次々と上昇してくるが、浮島の構造がこの大
量の気泡が大気と合流しやすい構造であることが必要で
ある。浮島が、浮力体で水面上に支持された枠体を有す
る場合（図１参照）は、浮島下面に空間があり、問題は
ない。浮島が、浮力体で水面下の所定深さに支持された
枠体を有する場合、散気管の巻き揚げ用ウインチや散気
管の回転防止索用オートテンションウインチを有する場
合（図３参照）は、ウインチは水面上に支持されてお
り、その下部に空所が存在する。したがってその空間に
上昇してきた空気が集合し、その空間から浮島を貫通し
た排気孔を設け排気する。この際枠体の梁材の上部とそ
の上に載置した植生基盤材との間には適宜に通気孔を設
け、ウインチ下部の空所に容易に通気できるようにす
る。浮島の枠体が、中央部が水面上にあり、周縁部が水
中所定深さに構成され、中央部に集気用空間を有する場
合（図５参照）は排気孔を浮島を貫通して設ければ排気
は充分に行える。Further, a large amount of air bubbles from the air diffuser rises on the lower surface of the vegetation floating island one after another, but the structure of the floating island needs to be a structure in which this large amount of air bubbles can easily merge with the atmosphere. When the floating island has a frame body supported on the water surface by a buoyant body (see FIG. 1), there is a space on the lower surface of the floating island and there is no problem. If the floating island has a frame supported by a buoyant body at a predetermined depth below the surface of the water, or if it has a winch for lifting the air diffuser or an auto-tension winch for preventing the rotation of the air diffuser (see Fig. 3), The winch is supported on the surface of the water, and there is a void below it. Therefore, the air that has risen in the space gathers, and an exhaust hole penetrating the floating island is provided from the space to exhaust the air. At this time, a ventilation hole is appropriately provided between the upper portion of the beam member of the frame and the vegetation base material placed on the beam member so that the void can be easily ventilated in the lower portion of the winch. When the frame of the floating island has a central part on the surface of the water, a peripheral part with a predetermined depth in the water, and an air collecting space in the central part (see FIG. 5), an exhaust hole is provided through the floating island. If so, exhaust can be sufficiently performed.
【００１６】また、植生浮島の構造を環状浮島（図７、
９、１０参照）とすれば、排気の問題はない。この場合
にも植生環状浮島の周囲に環状に水生植物植生域を設け
るとよい。In addition, the structure of the vegetation floating island is changed to a ring floating island (Fig. 7,
9 and 10), there is no problem of exhaust. Also in this case, it is advisable to provide an aquatic plant vegetation area in a ring shape around the vegetation ring floating island.
【００１７】また、曝気装置の散気管をこのように構成
すれば、散気は、散気管の水平度が多少かたむいても、
散気は均一に行われる。Further, if the air diffuser of the aeration device is constructed in this way, even if the level of the air diffuser is slightly bent,
Aeration is performed uniformly.
【００１８】また、曝気装置をこのように構成したこと
により、点検手入のため散気管の吊り索を巻き揚げ機で
巻き揚げると、散気管は上昇し、吊り索にガイド金物で
適宜間隔でガイドされた送気管は下方から連続Ｓ字状に
屈曲しながら上昇し、浮島下方に引き揚げられ、さらに
散気管の回転防止索の余長はオートテンションウインチ
に巻き取られ点検手入を容易に行える。また回転防止索
により散気中も散気管がねじれたりすることはない。Further, by constructing the aeration device in this way, when the hoisting device of the air diffusing pipe is hoisted by a hoist for maintenance, the air diffusing pipe is raised and the hoisting cord is guided by the guide metal at appropriate intervals. The guided air pipe rises while bending in a continuous S-shape from below and is lifted up below the floating island, and the extra length of the anti-rotation rope of the air diffuser is taken up by the auto-tension winch for easy maintenance. . Further, the anti-rotation cord prevents the air diffuser from being twisted during aeration.
【００１９】また、植生浮島をこのように構成したこと
により、植生浮島の直下に散気装置を吊り下げ曝気を行
い、さらに浮島を植生浮島として構成させることができ
る。Further, by constructing the vegetation floating island in this way, it is possible to suspend the air diffuser just below the vegetation floating island to perform aeration, and further to configure the floating island as a vegetation floating island.
【００２０】[0020]
【実施例】図１は本発明を実施した１実施例を示す全体
正面図で、本例では植生浮島から曝気装置の散気管を吊
り下げた場合を示す。図中１は植生浮島、２は曝気装置
の散気管、３は送気管でゴム等のフレキシブルホース、
４は散気管の吊り索、５は回転防止索で上端を枠体上の
オートテンションウインチ室２１に収容したオートテン
ションウインチに巻き取っている。６は係留索である。
７は植生浮島１の枠体で浮力体８により水面より上方に
支持されている。９は枠体の上面に網を敷きつめその上
に載置固定した植生基盤材、１０は植生基盤材９より水
面に垂した吸水材、１１は浮遊式の水生植物植生域でヤ
シ殻繊維等の植生基盤材中に浮子を適宜挿入配置して浮
力をつけ、上面下面を網で包んで扁平にし、アシ、ヨシ
等を植付けたもので、浮島の外縁に連結されている。１
２は吊り索４の上端を巻き取ったウインチを収容したウ
インチ室、浮島は複数の係留索６により水底又は岸に係
留されている。本装置は散気管を植生浮島から吊り下げ
ているので、ダム湖等の水位変動の激しい水域に適して
いる。EXAMPLE FIG. 1 is an overall front view showing an example in which the present invention is embodied. In this example, a diffuser pipe of an aeration device is suspended from a vegetation floating island. In the figure, 1 is a vegetation floating island, 2 is an air diffuser of an aeration device, 3 is an air supply pipe, and a flexible hose made of rubber or the like,
Reference numeral 4 is a diffusing pipe of an air diffusing pipe, and 5 is a rotation preventing rope, and the upper end thereof is wound around an auto tension winch housed in an auto tension winch chamber 21 on the frame. 6 is a mooring line.
Reference numeral 7 denotes a frame body of the vegetation floating island 1, which is supported above the water surface by a buoyant body 8. Reference numeral 9 is a vegetation base material which is laid and fixed on the upper surface of the frame body, 10 is a water absorbing material hung from the vegetation base material 9 on the water surface, 11 is a floating type aquatic plant vegetation area such as palm shell fiber A float is appropriately inserted and placed in the vegetation base material to give buoyancy, and the upper and lower surfaces are wrapped with a net to be flat, and reeds and reeds are planted, which are connected to the outer edge of the floating island. 1
A winch chamber 2 accommodates a winch in which the upper end of a suspension rope 4 is wound, and a floating island is moored by a plurality of mooring ropes 6 to the water bottom or shore. Since this device suspends the air diffuser from the vegetation floating island, it is suitable for water areas where the water level changes drastically such as dam lakes.
【００２１】水位変動が殆んどない湖沼では、散気管を
水底に設置し、その直上に植生浮島を係留（図示せず）
してもよい。或いは植生浮島下面中央に吊り索で散気管
を吊り下げ、さらに散気管を一端に水中浮体を付けた引
き込み係留索で水底の沈錘に取り付けた滑車を介して係
留し所定深さに散気管を係止し、その直上に植生浮島を
係留する。その実施例を図２に示す。１３は沈錘、１４
は滑車、１５は所定水深に吊り下げるための吊り下げ
索、１６は引き込み係留索、１７は水中浮体、１８は散
気管点検のための引き揚げ索である。植生浮島１は、浮
力体８により枠体７を水面下所定の深さに支持し、浮島
外周に水生植物植生域１１を造成し、浮島の中央下面に
集気用空間１９を構成し、そこに外気に通じる排気孔２
０が設けられている。In a lake where the water level hardly changes, an air diffuser is installed on the bottom of the water, and a floating vegetation island is moored just above it (not shown).
May be. Alternatively, suspend the diffusing pipe with a suspension line at the center of the bottom of the vegetation floating island, and moor it via a pulley attached to the sinker at the bottom of the water with a retracting mooring line with an underwater floating body at one end and attach the diffusing pipe to a predetermined depth. Lock it and moor the vegetation floating island just above it. An example thereof is shown in FIG. 13 is a sinker, 14
Is a pulley, 15 is a suspension line for suspending at a predetermined water depth, 16 is a retracting mooring line, 17 is an underwater floating body, and 18 is a lifting line for inspecting an air diffuser. The vegetation floating island 1 supports the frame body 7 at a predetermined depth below the water surface by the buoyancy body 8, forms an aquatic plant vegetation area 11 on the outer circumference of the floating island, and forms an air collection space 19 on the lower surface of the center of the floating island. Exhaust hole 2 leading to the outside
0 is provided.
【００２２】図３は植生浮島の枠体７は枠体の下面およ
び上面に配置した浮力体８により水面下所定位置に支持
された場合の実施例を示した植生浮島の一部切断正面
図、図４は図３の一部切断平面図である。散気管２を含
む曝気装置は図１と同様であるので、植生浮島のみを示
した図である。FIG. 3 is a partially cut front view of a vegetation floating island showing an embodiment in which the frame 7 of the vegetation floating island is supported at a predetermined position below the water surface by buoyant bodies 8 arranged on the lower and upper surfaces of the frame. FIG. 4 is a partially cutaway plan view of FIG. The aerating device including the air diffuser 2 is the same as that in FIG. 1, and therefore only the vegetation floating island is shown.
【００２３】２１は散気管の回転防止索５の一端を巻回
したオートテンションウインチ２１ａを収容したオート
テンションウインチ室、１２は散気管の吊り索４の巻き
揚げ用ウインチ１２ａを収容した巻き揚げ機室である。
枠体７の上面にエキスパンドメタル２２を敷設し、その
上に植生基盤材９を支持するネット２３を張設する。枠
体上面付の浮力体の上にもネットは張設する。植生基盤
材９は植生浮島の外周部では枠体上水面すれすれに薄く
設置し、水生植物が生育し、毛根が浮島下面に伸びてい
る。２４は送気管を点検時収容する配管スペースであ
る。２５は通路である。植生基盤材の上面にもネット２
３を張設する。Reference numeral 21 denotes an auto-tension winch chamber containing an auto-tension winch 21a wound around one end of the anti-rotation rope 5 of the air diffuser, and 12 a hoisting machine containing a winch 12a for hoisting the suspension pipe 4 of the air diffuser. It is a room.
An expanded metal 22 is laid on the upper surface of the frame body 7, and a net 23 for supporting the vegetation base material 9 is stretched on the expanded metal 22. The net is also stretched on the buoyant body with the upper surface of the frame. The vegetation base material 9 is thinly installed on the outer periphery of the vegetation floating island just above the water surface above the frame, where aquatic plants grow and hair roots extend to the lower surface of the floating island. Reference numeral 24 is a piping space for accommodating the air supply pipe during inspection. 25 is a passage. Net 2 on top of vegetation base material
3 is stretched.
【００２４】ウインチ室１２の底面は支持片１２ｂによ
り水面より高く支持され、水面上に空間１９が構成され
ている。また、オートテンションウインチ室２１の下部
にも同様に空間１９が形成され、曝気装置の曝気の集気
用空間として利用される。これらの空間と大気を連絡す
る排気孔は適宜設けられている。また、枠体７を構成す
る部材７ａの各桝間に散気管よりの曝気が溜るが、前記
空間１９に流通さすため、部材の上部に適宜通気孔を設
ければよい。通気孔２６の１例の部分詳細図の正面図を
図１８に、その平面図を図１９に示す。本例では枠体構
成部材７ａ（この場合は溝型鋼）のフランジ上に半円筒
状に曲げた通気用部材２６ａを溶接して通気孔２６を形
成している。勿論溝型鋼ウエブ材の上部に通気孔を穿設
してもよい。The bottom surface of the winch chamber 12 is supported higher than the water surface by a support piece 12b, and a space 19 is formed on the water surface. Further, a space 19 is similarly formed under the auto-tension winch chamber 21 and is used as a space for collecting aeration of the aeration device. Exhaust holes that connect these spaces to the atmosphere are provided as appropriate. Further, although aeration from the air diffuser is accumulated between the rods of the member 7a constituting the frame body 7, the air is circulated in the space 19, so a ventilation hole may be appropriately provided in the upper portion of the member. FIG. 18 shows a front view of a partial detailed view of an example of the vent hole 26, and FIG. 19 shows a plan view thereof. In this example, the ventilation hole 26 is formed by welding a semi-cylindrically bent ventilation member 26a on the flange of the frame member 7a (in this case, grooved steel). Of course, ventilation holes may be formed in the upper portion of the channel steel web material.
【００２５】図５は本発明を実施した曝気装置の植生浮
島の別の実施例を示した一部切断正面図で図６はその一
部切断平面図である。本実施例は浮島の中央部の枠体を
水面より高くし、枠体下部に曝気集気用空間１９を形成
し、周縁部の枠体を水面より低くし、曝気装置の散気管
よりの曝気が浮島の下面より大気に逃げ易くし、しかも
浮島周縁の水生植物植生域１１が容易に造成できるよう
にした植生浮島である。２０は排気孔である。浮島をこ
のように形成したことにより散気管より上昇する曝気を
容易に大気に逃せる他、浮島を軽量に経済的に構成で
き、さらに栄養塩の吸収に役立つ水生植物植生域１１を
浮島周縁部に容易に形成することができる。FIG. 5 is a partially cut front view showing another embodiment of the vegetation floating island of the aeration apparatus according to the present invention, and FIG. 6 is a partially cut plan view thereof. In this embodiment, the frame body at the center of the floating island is made higher than the water surface, the aeration and air collection space 19 is formed at the lower part of the frame body, the frame body at the peripheral portion is made lower than the water surface, and the aeration pipe of the aeration device is used. Is a vegetation floating island in which the aquatic plant vegetation area 11 on the periphery of the floating island can be easily created by making it easier to escape to the atmosphere from the lower surface of the floating island. 20 is an exhaust hole. By forming the floating island in this way, the aeration rising from the diffuser can be easily escaped to the atmosphere, the floating island can be constructed economically in a lightweight manner, and the aquatic plant vegetation area 11 that helps absorption of nutrient salts can be provided at the periphery of the floating island. Can be easily formed.
【００２６】図８は本発明を実施した曝気装置の植生浮
島のさらに別の実施例を示した一部切断平面図である。
図７は図８のＡ−Ａ視図を示した断面図である。本実施
例は曝気装置の散気管よりの曝気が逃げ易いように図６
で示した植生浮島の中央部をくり抜いて環状浮島とした
実施例を示したものである。散気を点検手入れするため
に巻き揚げるウインチ室１２は環状部の枠体上に配置し
ているが、滑車を中央部の空所に梁等を渡して取り付け
巻き揚げれば（図示せず）、浮島の中央部の空所に散気
管を引き揚げられ、点検手入に便利である。また植生浮
島の中央部が空所で空いていても、周囲からは見えず、
緑の浮島に見え景観上も支承がない。また中央部がない
ため、それだけ軽量にでき、資材的にも有利で経済的で
ある。FIG. 8 is a partially cutaway plan view showing still another embodiment of the vegetation floating island of the aeration apparatus according to the present invention.
FIG. 7 is a cross-sectional view showing an AA view of FIG. In this embodiment, the aeration from the air diffuser of the aeration device is facilitated to escape as shown in FIG.
An example is shown in which the central part of the vegetation floating island shown in is hollowed out to form an annular floating island. The winch chamber 12 for hoisting and cleaning the aeration is arranged on the frame of the annular part, but if the pulley is attached and hoisted by passing the beam etc. to the central empty space (not shown) , The air diffuser can be pulled up to the empty space in the center of the floating island, which is convenient for maintenance. Even if the central part of the vegetation floating island is empty, it is not visible from the surroundings,
It looks like a green floating island and there is no bearing on the landscape. In addition, since there is no central part, it can be made lighter, which is advantageous in terms of materials and economical.
【００２７】図９および図１０は本発明を実施した曝気
装置の植生浮島の環状浮島の別の実施例で、図９は枠体
が水面下所定深さに保持し水生植物植生域１１を浮島周
縁に造成した場合、図１０は枠体が水面上所定高さに浮
力体８で保持し浮島の外周に浮遊式の水生植物植生域１
１を係留した場合である。いづれも中央空間部の下方に
曝気装置の散気管が吊り下げられている。FIGS. 9 and 10 show another embodiment of the annular floating island of the vegetation floating island of the aeration apparatus according to the present invention. FIG. 9 shows the aquatic plant vegetation area 11 with the frame body kept at a predetermined depth below the water surface. When constructed on the periphery, FIG. 10 shows that the frame body is held at a predetermined height above the water surface by a buoyant body 8 and a floating aquatic plant vegetation area 1 is provided around the floating island.
1 is when moored. In each case, the air diffuser of the aeration device is suspended below the central space.
【００２８】図１１は本発明を実施した曝気装置の斜視
図である。散気管２は吊り索４の枝索４ａに係止され、
送気管３は散気管２より立ち上り、適宜間隔で取り付け
たガイド金物２７により吊り索４および係留索６に添わ
して陸上のコンプレッサー室に至る。回転防止索５は浮
島と散気管を交叉状に連結する。図１２は散気管２を点
検するため吊り索４を巻き揚げ機１２ａにより巻き揚げ
る途中の状態を示した図である。送気管３は連続Ｓ字状
に屈曲して引き揚げられ、浅い位置で点検手入れが容易
となる。散気管の回転防止索５は散気管が引き揚げられ
余長が出た分だけ浮島上のオートテンションウインチで
巻き取られ、常に一定の張力で張っている。FIG. 11 is a perspective view of an aeration apparatus embodying the present invention. The air diffuser 2 is locked to the branch line 4a of the suspension line 4,
The air supply pipe 3 rises from the air diffuser pipe 2 and reaches the compressor chamber on land along with the suspending rope 4 and the mooring rope 6 by the guide metal fittings 27 attached at appropriate intervals. The anti-rotation rope 5 connects the floating island and the air diffuser in a cross shape. FIG. 12 is a view showing a state where the hoisting rope 4 is being hoisted by the hoisting machine 12a in order to inspect the air diffuser 2. The air supply pipe 3 is bent in a continuous S-shape and lifted up, and inspection and maintenance are easy at a shallow position. The anti-rotation rope 5 of the air diffuser is wound up by an auto-tension winch on the floating island as much as the air diffuser is lifted and the surplus length appears, and is always stretched with a constant tension.
【００２９】図１３は散気管２を吊り索４により吊り下
げた状態の正面図、図１４は散気管２の平面図、図１５
はガイド金物２７の詳細図で（ａ）は正面図、（ｂ）は
側面図、（ｃ）は（ｂ）のＡ−Ａ視図である。ガイド金
物２７はガイドパイプ２７ａ、Ｕバンド２７ｂ、Ｕバン
ド取付板２７ｃ、ガイドパイプに固定した連結金物２７
ｄ、連結金物２７ｄとＵバンド取付板２７ｃを回動自在
に連結した水平軸を有する回転ピン２７ｅとよりなる。
このガイド金物２７により散気管を引き揚げた時送気管
は連続Ｓ字状に屈曲して引き揚げられる。FIG. 13 is a front view of the air diffusing tube 2 suspended by the hanging rope 4, FIG. 14 is a plan view of the air diffusing tube 2, and FIG.
Is a detailed view of the guide metal 27, (a) is a front view, (b) is a side view, and (c) is a view taken along the line AA of (b). The guide hardware 27 is a guide pipe 27a, a U band 27b, a U band mounting plate 27c, and a connecting hardware 27 fixed to the guide pipe.
d, a connecting hardware 27d and a rotary pin 27e having a horizontal shaft that rotatably connects the U-band mounting plate 27c.
When the air diffuser is pulled up by the guide hardware 27, the air feed pipe is bent in a continuous S-shape and is pulled up.
【００３０】図１６は散気管のヘッダーパイプ２８の正
面図で２８ａは送気管取付フランジ、２９は枝管であ
る。図１４の３０は散気管の環状管である。環状管３０
の枝管取付部の中間に盲板３１が設けられ、散気管が少
し傾いても平均に散気が行われる。３２は散気管の枝管
に取り付けた重錘である。図１７は散気管の環状管３０
の断面を示し、散気孔３３の開孔状態を示した図であ
る。FIG. 16 is a front view of the header pipe 28 of the air diffuser, in which 28a is an air supply pipe mounting flange and 29 is a branch pipe. Reference numeral 30 in FIG. 14 is an annular tube of an air diffuser. Annular tube 30
A blind plate 31 is provided in the middle of the branch pipe mounting portion of the above, and even if the air diffuser is slightly inclined, air is diffused evenly. Reference numeral 32 is a weight attached to the branch pipe of the air diffuser. FIG. 17 shows an annular tube 30 of an air diffuser.
It is a figure showing the section and showing the open state of diffuser hole 33.
【００３１】[0031]
【発明の効果】植生浮島直下に散気管式曝気装置を設け
たことにより、曝気により酸素を多く含んだ栄養塩に富
んだ中層・深層よりの上昇流が浮島の下面中央から四方
にゆっくりした拡散流を形成する。この拡散流は浮島周
縁部の植生植物に適当な水流を与え、水中の栄養塩の吸
収を良好ならしめる。また植物性プランクトン引いては
動物性プランクトンの発生をうながし、周縁部には魚類
の餌となる動物性プランクトンが豊富になり、散気管よ
りの気泡により魚類が集まり、さらに浮島周縁部の水生
植物の毛根は産卵場所となり、ゆっくりとした拡散流が
当り、卵への酸素の供給は充分に行われ、魚類の良好な
生息環境を造出する。また、植生浮島の周縁部の水生植
物植生域により、栄養塩の吸収をうながし、湖沼の水質
の改善を促進し、植生浮島の植物を充分繁茂させ、緑化
をうながし、環境の美化にも貢献する。また、曝気装置
の浮体として植生浮島を兼用したことにより、曝気装置
の浮体は省略でき、経済的な効果がある。EFFECTS OF THE INVENTION By installing an air diffuser type aerator directly under the floating island, the upward flow from the middle and deep layers rich in oxygen-rich nutrients due to aeration slowly diffuses in all directions from the bottom center of the floating island. Form a stream. This diffusive flow gives a proper flow of water to the vegetation plants around the floating islands, and promotes absorption of nutrients in the water. In addition, phytoplankton pulls out the development of zooplankton, and zooplankton, which is the food for fish, is abundant in the periphery, and fish collect due to air bubbles from the aeration tube. The hair root becomes the spawning site, and a slow diffusion flow hits it, oxygen is sufficiently supplied to the egg, and a good habitat for fish is created. In addition, the aquatic plant vegetation area around the vegetation floating island promotes absorption of nutrient salts, promotes improvement of water quality in lakes and marshes plants of the vegetation floating island, promotes greening, and contributes to beautification of the environment. . Moreover, since the vegetation floating island is also used as the floating body of the aeration device, the floating body of the aeration device can be omitted, which is economically effective.
【図１】本発明の一実施例を示す全体正面図、FIG. 1 is an overall front view showing an embodiment of the present invention,
【図２】本発明の別の実施例を示す全体正面図、FIG. 2 is an overall front view showing another embodiment of the present invention,
【図３】本発明の曝気装置の植生浮島の一実施例を示す
一部切断正面図、FIG. 3 is a partially cut front view showing an embodiment of a vegetation floating island of the aeration device of the present invention,
【図４】図３の一部切断平面図、FIG. 4 is a partially cutaway plan view of FIG.
【図５】本発明の曝気装置の植生浮島の別の実施例を示
す一部切断正面図、FIG. 5 is a partially cutaway front view showing another embodiment of the vegetation floating island of the aeration apparatus of the present invention,
【図６】図５の一部切断平面図、6 is a partially cutaway plan view of FIG.
【図７】本発明の曝気装置の植生環状浮島の実施例を示
す横断図、FIG. 7 is a cross-sectional view showing an embodiment of a vegetation annular floating island of the aeration device of the present invention,
【図８】図７の一部切断平面図、8 is a partially cutaway plan view of FIG. 7,
【図９】本発明の曝気装置の植生環状浮島の別の実施例
を示す横断図、FIG. 9 is a cross-sectional view showing another embodiment of the vegetation annular floating island of the aeration apparatus of the present invention,
【図１０】本発明の曝気装置の植生環状浮島のさらに別
の実施例を示す横断図、FIG. 10 is a cross-sectional view showing still another embodiment of the vegetation annular floating island of the aeration device of the present invention,
【図１１】本発明の曝気装置の一実施を示す全体斜視
図、FIG. 11 is an overall perspective view showing an embodiment of an aeration device of the present invention,
【図１２】散気管を引き揚げる途中の状態を示す説明
図、FIG. 12 is an explanatory view showing a state in which the air diffuser is being pulled up;
【図１３】散気管を吊り下げた状態を示す正面図、FIG. 13 is a front view showing a state in which the air diffuser is suspended.
【図１４】散気管の平面図、FIG. 14 is a plan view of an air diffuser,
【図１５】ガイド金物の詳細図で（ａ）は正面図、
（ｂ）は側面図、（ｃ）は（ｂ）のＡ−Ａ視図、FIG. 15 is a detailed view of the guide hardware, (a) is a front view,
(B) is a side view, (c) is an A-A view of (b),
【図１６】ヘッダーパイプの正面図、FIG. 16 is a front view of a header pipe,
【図１７】散気管の環状管の断面図、FIG. 17 is a sectional view of an annular pipe of an air diffuser,
【図１８】通気孔の一例を示す正面図、FIG. 18 is a front view showing an example of a ventilation hole,
【図１９】図１８の平面図である。FIG. 19 is a plan view of FIG. 18;
１ 植生浮島 ２ 散気管 ３ 送気管 ４ 吊り索 ５ 回転防止索 ６ 係留索 ７ 枠体 ８ 浮力体 ９ 植生基盤材 １１ 水生植物植生域 １２ ウインチ室 １３ 沈錘 １９ 集気用空間 ２０ 排気孔 ２１ オートテンションウインチ室 ２６ 通気孔 ２７ ガイド金物 ２８ ヘッダーパイプ ２９ 枝管 ３０ 環状管 ３１ 盲板 1 Vegetation floating island 2 Air diffuser 3 Air supply pipe 4 Suspension rope 5 Anti-rotation rope 6 Mooring rope 7 Frame 8 Buoyant body 9 Vegetation base material 11 Aquatic plant vegetation area 12 Winch chamber 13 Sinking weight 19 Air collection space 20 Exhaust hole 21 Auto Tension winch chamber 26 Vent hole 27 Guide hardware 28 Header pipe 29 Branch pipe 30 Annular pipe 31 Blind plate
───────────────────────────────────────────────────── フロントページの続き (72)発明者 波多野 紀夫 大阪府池田市豊島南２丁目176番地の１ ゼニヤ海洋サービス株式会社内 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Norio Hatano Inventor Norio 1 Hatena 2-chome, Toshima Minami 2-chome, Ikeda City, Osaka Prefecture Zenya Marine Service Co., Ltd.
Claims (7)
とを特徴とする曝気装置。1. An aerating device comprising an air diffuser provided in the water below the vegetation floating island.
島の周りに水生植物植生域を設けたことを特徴とする曝
気装置。2. The aeration apparatus according to claim 1, wherein an aquatic plant vegetation area is provided around the vegetation floating island.
島の下面中央部に集気空間を設け、外気に通じる排気孔
を浮島を貫通して設けたことを特徴とする曝気装置。3. An aerator according to claim 1, wherein an air collecting space is provided in a central portion of the lower surface of the vegetation floating island, and an exhaust hole communicating with the outside air is provided through the floating island.
島を環状浮島としたことを特徴とする曝気装置。4. The aeration apparatus according to claim 1, wherein the vegetation floating island is an annular floating island.
置の散気管を、吐出孔を多数穿設した水平リング管と、
水平リング管中央に位置し送気管を接続したヘッダと、
ヘッダより分岐し水平リング管の等分位置に接続した複
数本の枝管と水平リング管の各枝管接続位置の中間に挿
入した盲板とよりなる散気管としたことを特徴とする曝
気装置。5. The aeration apparatus according to claim 1, wherein the air diffuser of the aeration apparatus is a horizontal ring tube having a large number of discharge holes.
A header located in the center of the horizontal ring pipe and connected to the air supply pipe,
An aeration device comprising a plurality of branch pipes branched from a header and connected at equal positions of a horizontal ring pipe, and a blind plate inserted between the branch pipe connection positions of the horizontal ring pipe to form an air diffuser. .
置を下端に複数本の枝索を有し該枝索で散気管を支持し
た吊り索の上端を浮島上のウインチに巻き取って巻き揚
げ巻き降し自在に支持すると共に、浮島上の複数個のオ
ートテンションウインチに上端を巻き取った複数本の回
転防止索の下端により散気管を支持し、送気管を吊り索
に上下動自在に添わすガイド金物を、吊り索をパイプ内
に挿通したガイドパイプと、送気管の所定位置に所定間
隔で固定した固定部と、一端を固定部に回動自在に水平
ピン結合し他端をガイドパイプに固定した回動部とより
なり、散気管吊り索をウインチにより巻き揚げた時送気
管が吊り索中心に連続Ｓ字状に屈曲すると共に回転防止
索の余長をオートテンションウインチにより巻き取るこ
とを特徴とする曝気装置。6. The aeration apparatus according to claim 1, wherein the aeration apparatus has a plurality of branch lines at its lower end, and the upper end of the suspension line supporting the air diffuser with the branch lines is wound around a winch on a floating island. It supports lifting and lowering freely, and supports the air diffuser by the lower ends of multiple anti-rotation ropes whose upper ends are wound around multiple auto-tension winches on floating islands, allowing the air supply pipe to move up and down on the hanging ropes. The guide metal to be attached is a guide pipe in which a suspension rope is inserted into the pipe, a fixed part fixed at a predetermined position of the air supply pipe at a predetermined interval, and one end is rotatably connected with a horizontal pin and the other end is guided. It consists of a rotating part fixed to the pipe, and when the air diffusing line is wound up by a winch, the air pipe bends in a continuous S shape around the center of the hanging line and the extra length of the rotation prevention line is wound up by an auto-tension winch. Exposure characterized by Apparatus.
島を、浮島の平面形状に形成した枠体と、枠体を水面に
対し所定位置に支持する浮体と、散気管吊り索を巻き取
り支持した枠体上に取り付けたウインチと、複数本の散
気管回転防止索の各上端部を巻き取り枠体上に取り付け
た同数のオートテンションウインチと、枠体上に配置し
各ウインチ間を埋めるように配置した植生基盤材とより
なる植生浮島としたことを特徴とする曝気装置。7. The aeration apparatus according to claim 1, wherein a vegetation floating island has a frame body formed in a plane shape of the floating island, a floating body for supporting the frame body at a predetermined position with respect to the water surface, and a diffusing pipe sling. A winch mounted on a supported frame, an equal number of auto-tension winches mounted on the frame with the upper ends of a plurality of air diffusing tube anti-rotation lines installed, and a space between each winch placed on the frame. An aerator characterized by being a vegetation floating island consisting of vegetation base materials arranged in this way.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP29903395A JP3186958B2 (en) | 1995-10-23 | 1995-10-23 | Aeration device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP29903395A JP3186958B2 (en) | 1995-10-23 | 1995-10-23 | Aeration device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH09117787A true JPH09117787A (en) | 1997-05-06 |
| JP3186958B2 JP3186958B2 (en) | 2001-07-11 |
Family
ID=17867350
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP29903395A Expired - Lifetime JP3186958B2 (en) | 1995-10-23 | 1995-10-23 | Aeration device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3186958B2 (en) |
Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20030054246A (en) * | 2001-12-24 | 2003-07-02 | (주)이앤엠코리아 | A direct water purifying method and apparatus using an artificial plant island and pressure flatation in the sea, lakes and rivers |
| JP2006289275A (en) * | 2005-04-12 | 2006-10-26 | Matsumura Sangyo Kk | Water cleaning apparatus and hydroponic culture apparatus using the same |
| JP2009061824A (en) * | 2007-09-04 | 2009-03-26 | Shin Kurushima Dockyard Co Ltd | Apparatus and method for filling/replacing inert gas in cargo tank of liquid tanker |
| KR100927241B1 (en) * | 2009-01-29 | 2009-11-16 | 한국해양연구원 | Water plant island |
| JP2010046606A (en) * | 2008-08-22 | 2010-03-04 | Taisei Corp | Seawater circulation apparatus |
| JP2011143400A (en) * | 2009-12-17 | 2011-07-28 | Marsima Aqua System Corp | Lifting type aeration/circulation apparatus |
| CN106277347A (en) * | 2016-10-28 | 2017-01-04 | 宁波大学 | A kind of chinampa monomer and apply the combined ecological floating island of this chinampa monomer |
| CN106277346A (en) * | 2016-10-28 | 2017-01-04 | 宁波大学 | A kind of anti-wave ecological chinampa |
| JP2017099302A (en) * | 2015-11-30 | 2017-06-08 | 西日本技術開発株式会社 | Revival method of aquatic plants, and apparatus thereof |
| CN107151057A (en) * | 2017-07-13 | 2017-09-12 | 南京八本堂环保科技有限公司 | Tank type solar energy chinampa and ecological water body repair system |
| CN110495411A (en) * | 2019-08-27 | 2019-11-26 | 中国水产科学研究院珠江水产研究所 | A kind of cultural method of mandarin fish |
| CN112320964A (en) * | 2020-10-29 | 2021-02-05 | 嘉兴学院 | River regulation is with removing chinampa |
-
1995
- 1995-10-23 JP JP29903395A patent/JP3186958B2/en not_active Expired - Lifetime
Cited By (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20030054246A (en) * | 2001-12-24 | 2003-07-02 | (주)이앤엠코리아 | A direct water purifying method and apparatus using an artificial plant island and pressure flatation in the sea, lakes and rivers |
| JP2006289275A (en) * | 2005-04-12 | 2006-10-26 | Matsumura Sangyo Kk | Water cleaning apparatus and hydroponic culture apparatus using the same |
| JP2009061824A (en) * | 2007-09-04 | 2009-03-26 | Shin Kurushima Dockyard Co Ltd | Apparatus and method for filling/replacing inert gas in cargo tank of liquid tanker |
| JP4546509B2 (en) * | 2007-09-04 | 2010-09-15 | 株式会社新来島どっく | Inert gas injection / replacement equipment and inert gas injection / replacement method for cargo tanks of liquid cargo ships |
| JP2010046606A (en) * | 2008-08-22 | 2010-03-04 | Taisei Corp | Seawater circulation apparatus |
| KR100927241B1 (en) * | 2009-01-29 | 2009-11-16 | 한국해양연구원 | Water plant island |
| JP2011143400A (en) * | 2009-12-17 | 2011-07-28 | Marsima Aqua System Corp | Lifting type aeration/circulation apparatus |
| JP2017099302A (en) * | 2015-11-30 | 2017-06-08 | 西日本技術開発株式会社 | Revival method of aquatic plants, and apparatus thereof |
| CN106277347A (en) * | 2016-10-28 | 2017-01-04 | 宁波大学 | A kind of chinampa monomer and apply the combined ecological floating island of this chinampa monomer |
| CN106277346A (en) * | 2016-10-28 | 2017-01-04 | 宁波大学 | A kind of anti-wave ecological chinampa |
| CN106277347B (en) * | 2016-10-28 | 2019-08-02 | 宁波大学 | A kind of chinampa monomer and the combined ecological floating island using the chinampa monomer |
| CN106277346B (en) * | 2016-10-28 | 2019-08-02 | 宁波大学 | A kind of anti-wave ecological chinampa |
| CN107151057A (en) * | 2017-07-13 | 2017-09-12 | 南京八本堂环保科技有限公司 | Tank type solar energy chinampa and ecological water body repair system |
| CN110495411A (en) * | 2019-08-27 | 2019-11-26 | 中国水产科学研究院珠江水产研究所 | A kind of cultural method of mandarin fish |
| CN112320964A (en) * | 2020-10-29 | 2021-02-05 | 嘉兴学院 | River regulation is with removing chinampa |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3186958B2 (en) | 2001-07-11 |
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