JP3823998B2

JP3823998B2 - Flood control and irrigation system using tidal current generating device by "UTSURO"

Info

Publication number: JP3823998B2
Application number: JP2004570560A
Authority: JP
Inventors: 一昭赤井
Original assignee: 一昭赤井
Priority date: 2003-04-07
Filing date: 2003-04-07
Publication date: 2006-09-20
Anticipated expiration: 2023-04-07
Also published as: CN1764760A; WO2004090235A1; JPWO2004090235A1; CN1764760B

Description

この発明は、「海洋の空（ＵＴＳＵＲＯ）」による潮流発生装置を利用した治水および水利システムに関する。 The present invention relates to a flood control and irrigation system using a tidal current generating device based on the “ocean sky (UTSURO)”.

河川の上流部から流出する砂泥により、また、近世紀では河口両岸の埋め立等により河川延長が徐々に増加し、河川全体の河床勾配が緩くなる。これにより、河道に土砂が沈降し、河床が上昇して、河川の洪水疎通能力が低下し、舟運や内水排除が困難になっている。
従来までは人工的に河床を掘削するか、河道に導流堤を設置して河川の流れのエネルギーにより、河床を深く維持してきたが、洪水時には、これによる洪水疎通の障害や、天井川を助長し、内水排除にも問題が生じていた。
このため、かねてより開発を進めてきた「海洋の空（ＵＴＳＵＲＯ）」による潮流発生装置を利用して、潮汐の影響を受ける河川下流や河口部については、積極的に潮汐のエネルギーを導入して河川の下流や河口の維持浚渫を行うことにより、機能的な河川延長を短くして、河床勾配を高め、治水に役立てると共に、かねてより「海洋の空（ＵＴＳＵＲＯ）」による水域の浄化システムを利用して上流部から流出した汚濁水を積極的に取り込み、洪水疎通能力を高めると共に、河川の汚濁水を浄化し、干潟や土地を造成し、河川水の保持に役立てようとするものである。Due to the sand mud flowing out from the upstream part of the river, and in the last century, the river extension gradually increases due to the reclamation of both river mouths, and the river bed slope of the entire river becomes gentle. As a result, sediments settle down in the river channel, the riverbed rises, the flooding capacity of the river declines, and it becomes difficult to remove boats and remove internal water.
In the past, the riverbed was artificially excavated, or a dike was installed in the river channel, and the riverbed was maintained deeply by the energy of the river flow. However, there was a problem in draining the internal water.
For this reason, the tidal current generator using the “UTSURO”, which has been under development for some time, is used to actively introduce tidal energy into downstream rivers and estuaries that are affected by tides. By performing maintenance dredging on the downstream and estuary of the river, the functional river extension is shortened, the riverbed slope is increased, and it is used for flood control. For some time, the water purification system using the “Utsuro Sky (UTSURO)” has been used. In this way, the polluted water that has flowed out from the upstream part is actively taken in, and the flood communication capacity is improved, and the polluted water in the river is purified, and the tidal flat and the land are created to help preserve the river water.

本発明は、第１図に示すように、潮位変化のある水域で、堤体構造によって囲い締め切られた水域を「海洋の空（ＵＴＳＲＯ）」と言い、「海洋の空（ＵＴＳＲＯ）」Ａの水域を水路で開放する水路口を、河川の上流部に向かって延伸し、潮位変化のある河川上流水域で開放する「海洋の空（ＵＴＳＵＲＯ）」Ａによる潮流発生装置により、開放口より下流部Ｌｂ区間は潮汐の支配する河川となり、従来の河川延長Ｌｏとすれば、河川の機能延長は（Ｌｏ−Ｌｂ）河川上流部の延長Ｌａとなり、河川の機能延長を短くすることが出来る。
潮汐のエネルギーと河川の流れのエネルギーの役割を再配分することにより、上流部では、従来の河川の流れのエネルギーを卓越させ、河口部では潮汐のエネルギーを積極的に導入して、潮汐のエネルギーを卓越させることにより、上流部では河川の機能的な延長を短くし、治水に役立てようとするものである。
河川の上流の山間部では河床高はあまり変化しないが、沖積平野では、河川の機能延長が短くなれば、河床勾配が大きくなり、流速が早く、掃流力が高められ、河床が深く洗屈され、河川の洪水疎通断面が大きくなると共に、天井川が解消し、上流部の治水効果を高めることが出来る。
また、河川の下流部では、第１図に示す「海洋の空（ＵＴＳＵＲＯ）」Ａの規模を大きくして、潮流発生能力を高めることにより、下流部での潮汐による流量を増加させて、掃流力を高め、河床を深くして、洪水の疎通断面を常に確保することにより、下流部での治水効果はもとより、内水排除や河口部での航路の維持浚渫に寄与しようとするものである。
なお、河口部では上流より流出した砂泥が、流速の低下に伴い河道に沈降し河道を浅くする。このため、将来埋め立てや、干潟造成が可能な水域を選んで、多空隙を有する透過構造の堤体により囲い締め切られた、「海洋の空（ＵＴＳＵＲＯ）」Ｂ（静穏浄化水域）を設置して、上げ潮時に、上流で洗掘され流出した泥水を取り込み、「海洋の空（ＵＴＳＵＲＯ）」Ｂの静穏浄化水域を利用して泥水の泥を沈降させて、干潟や埋立地を造成し、引潮時には浄化した上わ水を河道に集め、「海洋の空（ＵＴＳＵＲＯ）」Ａにより発生する潮流に加えて、河口の流量を増加させ河道の断面を維持する。
さらに、河口の「海洋の空（ＵＴＳＵＲＯ）」Ｂを含む外郭部を囲う堤体８′を設置することにより、外海６への泥水の流出を防止し、河口部の潮流を増加させ、河口の汽水域を保持し、河川水域の水産資源を豊富にして、洪水の疎通能力を高め、航路の維持を行い、治水や利水効果を高める。
また、「海洋の空（ＵＴＳＵＲＯ）」Ａによる潮流発生装置の機能を永久的に維持させるために、「海洋の空（ＵＴＳＵＲＯ）」Ａの張潮による河川泥水の流入を阻止するために、「海洋の空（ＵＴＳＲＯ）」Ａの開放水路３の延長Ｌｂを長くして、Ｌｂ＞Ｌｔ×α ただし、（Ｌｔ；開放水路における河川よりの張潮長、α：水路の拡散による係数、）の条件を満足させる必要がある。（したがって、開放水路３を汚濁防止水路とも言う。）In the present invention, as shown in FIG. 1, a water area surrounded by a bank structure in a water area having a tide level change is referred to as “ocean sky (UTSRO)”, and “ocean sky (UTSRO)” A The waterway opening that opens the water area with a waterway extends toward the upstream part of the river, and the tide flow generator by “UTSURO” A that opens in the upstream water area of the river where the tide level changes, the downstream part from the opening. The Lb section is a river controlled by tides. If the conventional river extension Lo is used, the function extension of the river becomes (Lo-Lb) the extension La of the upstream part of the river, and the function extension of the river can be shortened.
By redistributing the roles of tide energy and river flow energy, the upstream stream will make the traditional river flow energy superior, and the estuary will actively introduce tide energy to the tide energy. By trying to make it superior, it is intended to shorten the functional extension of the river in the upstream and to help flood control.
In the mountainous area upstream of the river, the riverbed height does not change very much, but in the alluvial plain, if the function extension of the river is shortened, the riverbed gradient increases, the flow velocity increases, the tractive force increases, and the riverbed is deeply swamped. As a result, the flood cross section of the river becomes larger, the ceiling river is eliminated, and the flood control effect in the upstream area can be enhanced.
Further, in the downstream part of the river, the scale of “UTSURO” A shown in FIG. 1 is increased to increase the tidal current generation capability, thereby increasing the flow rate due to the tide in the downstream part and increasing the flow. By increasing the flow force, deepening the riverbed, and always ensuring a cross-section of flood, not only the flood control effect in the downstream, but also the drainage of inland water and the maintenance of the channel in the estuary. is there.
At the estuary, sand mud that flows out from the upstream sinks into the river channel as the flow velocity decreases, making the channel shallower. For this reason, select a water area where land reclamation and tidal flats can be created in the future, and install “Sea of Ocean (UTSURO)” B (Quietly Purified Water Area), which is closed by a penetrating structure with a multi-hole structure. At the time of rising tide, the muddy water scoured and discharged upstream is taken in, and the mud mud is submerged using the calm purification water area of “UTSURO” B to create tidal flats and landfills. Purified upper water is collected in the river channel, and in addition to the tide generated by “UTSURO” A, the flow rate of the estuary is increased to maintain the cross section of the river channel.
Furthermore, by installing a levee body 8 'that surrounds the outer part of the estuary, including the “UTSURO” B, it prevents muddy water from flowing into the open sea 6 and increases the tide of the estuary. Maintain brackish water, enrich fisheries resources in river water, increase flood communication capacity, maintain the channel, and improve flood control and water use effects.
In addition, in order to permanently maintain the function of the tidal current generating device by the “ocean sky (UTSURO)” A, in order to prevent the inflow of river mud due to the tension of the “ocean sky (UTSURO)” A, “ The length Lb of the open water channel 3 of the ocean sky (UTSRO) A is lengthened, and Lb> Lt × α where (Lt: the length of the tide from the river in the open water channel, α: coefficient due to diffusion of the water channel) It is necessary to satisfy. (Therefore, the open water channel 3 is also called a pollution prevention water channel.)

第１図は、河川の略図で、河口の支流口に「海洋の空（ＵＴＳＵＲＯ）」Ａによる潮流発生装置を、また、本流河口部には流出泥砂を取り込む「海洋の空（ＵＴＳＵＲＯ）」Ｂを設置した平面図である。
第２図は、上記第１図における本川の縦断面図である。
第３図は各河川の横断面図である。
ａ−ａ断面は河川上流５水域の横断面図である。
ｂ−ｂ断面は河川下流４水域の横断面図である。
ｃ−ｃ断面は潮流発生水路３の横断面図である。
ｄ−ｄ断面は河口外水域の横断面図である。Fig. 1 is a schematic diagram of a river. A tide generator is created at the estuary of the estuary by “Ocean Sky (UTSURO)” A, and the main stream estuary is “Ocean Sky (UTSURO)” B. It is the top view which installed.
FIG. 2 is a longitudinal sectional view of the main river in FIG.
FIG. 3 is a cross-sectional view of each river.
The aa cross section is a cross-sectional view of the five upstream water areas.
The bb section is a cross-sectional view of the four downstream water areas.
The section cc is a cross-sectional view of the tidal flow generating channel 3.
The dd section is a cross-sectional view of the estuary water area.

符号の説明Explanation of symbols

１：「海洋の空（ＵＴＳＵＲＯ）」Ａを構成する締め切り堤
２：「海洋の空（ＵＴＳＵＲＯ）」Ａの内水域
３：「海洋の空（ＵＴＳＵＲＯ）」Ａの開放水路（汚濁防止水路とも言う）
４：河川の下流部
５：河川の上流部
６：外水域
７：陸地または護岸堤
８：「海洋の空（ＵＴＳＵＲＯ）」Ｂの透過堤
８′：河口の「海洋の空（ＵＴＳＵＲＯ）」Ｂを含む外郭部を囲う堤体
９：「海洋の空（ＵＴＳＵＲＯ）」Ｂの内水域
９′：「海洋の空（ＵＴＳＵＲＯ）」Ｂの内水域に沈降した砂泥
１０：従来の河川の河床高
１１：従来の河川水面高
１２：従来の河川陸地高
１３：従来の河川のＨＨＷＬ
１４：従来の河川の堤防高
１５：断定河床
１６：新しい河川の安定河床
１７：潮流によって直接洗掘された新しい河床
１８：潮汐のＴＨＷＬ
１９：潮汐のＴＬＷＬ
２０：潮流によって掘削される河床

1: Deadline that constitutes “UTSURO” A 2: Inner water area of “UTURO” A 3: Open water channel of “UTSURO” A (also known as pollution prevention channel) )
4: Downstream part of the river 5: Upstream part of the river 6: Outer water area 7: Land or revetment 8: Permeation embankment of the “ocean sky (UTSURO)” B 8 ′: “Ocean sky (UTSURO)” B 9: “Sand mud sinking in the inner water area of“ UTSURORO ”B” 10: Conventional river bed height 11: Conventional river water level 12: Conventional river land height 13: Conventional river HHWL
14: Dike height of conventional river 15: Established river bed 16: New river stable river bed 17: New river bed scoured directly by tidal current 18: Tidal THWL
19: Tidal TLWL
20: Riverbed excavated by tidal current

本発明をより詳細に説述するために、添付図面に従ってこれを説明する。
第１図の平面図に示すように、潮位変化のある水域で、堤体構造１によって囲い締め切られた水域を「海洋の空（ＵＴＳＲＯ）」と言い、「海洋の空（ＵＴＳＲＯ）」Ａの水域を水路で開放する水路口を、河川の上流部に向かって延伸し、潮位変化のある河川上流水域で開放する「海洋の空（ＵＴＳＵＲＯ）」Ａによる潮流発生装置により、開放口より下流部Ｌｂ区間は潮汐の支配する河川となり、従来の河川延長Ｌｏとすれば、河川の機能延長は（Ｌｏ−Ｌｂ）河川上流部の延長Ｌａとなり、河川の機能延長を短くすることが出来る。
河川の形成過程で、流出砂泥により沖積平野を形成し、河川の規模が大きく成る程、また、緩流河川と成るほど、河口部の幹川が何本かの支川に分かれ海に流入する。
このような支川３の河口部に、第１図に示す「海洋の空（ＵＴＳＲＯ）」Ａを構成する不透過性の堤体１によって囲い締め切られた水域を形成し、支川３を通じ、本川４に開放することにより、外海６に潮位変化を生じれば、河川の下流部４を通じ、支川３（開放水路）を経て、「海洋の空（ＵＴＳＵＲＯ）Ａに流出入を繰り返す。
河川本来の固有流量Ｑｏ，「海洋の空（ＵＴＳＵＲＯ）」Ａより流出する潮流Ｑｃとすれば、引き潮時の河川下流部４の水量Ｑｂは（Ｑｂ＝Ｑｏ＋Ｑｃ、）となる。河川本来の固有流量Ｑｏは河川によって限定されるが、「海洋の空（ＵＴＳＵＲＯ）」Ａより流出する潮流Ｑｃは「海洋の空（ＵＴＳＵＲＯ）」Ａの規模に応じて大きくすることが可能である。
「海洋の空（ＵＴＳＵＲＯ）」Ａの規模を大きくし、潮流発生流量Ｑｃを河川の洪水流量に匹敵する規模の「海洋の空（ＵＴＳＵＲＯ）」Ａを構成することにより、河川下流部４の水域には常に洪水流量に匹敵する潮流量Ｑｂが流出入を繰り返すことになる。
このように、洪水に匹敵する莫大な潮流Ｑｂが河川河口部４に流れても、所詮潮汐によって発生する流れであるため、海水面下（ＴＨＷＬ以下）の流れで、陸域の堤防高を溢れることがない。
したがって、第１図に示しように、支川３の河口に「海洋の空（ＵＴＳＵＲＯ）」Ａを構成することにより、河川下流部４の延長Ｌｂは形状的には河川の下流部を構成しているように見えるが、機能的には海峡や灘の性質を持つようになる。したがって、従来の全河川をＬｏとすれば、（Ｌｏ−Ｌｂ）即ち上流部の河川延長Ｌａが新しい河川の機能延長となる。
従来の河川上流部の河床高をＨｏとすれば、従来の河床勾配Ｉｏは（Ｈｏ／Ｌｏ），新しい河川の河床勾配Ｉａは（Ｈｏ／（Ｌ−Ｌｂ））となり、第２図に示すようにＩｏ＜Ｉａとなり、河床勾配は大きくなる。
上流部の河床勾配が大きくなると、流速が大きくなり、掃流力が高められ、河床が深く洗屈され、河川の洪水疎通断面が大きくなる。このことにより、天井川が徐々に解消され、治水能力が高められる。
また、河川の下流部４では、上記に示す「海洋の空（ＵＴＳＵＲＯ）」Ａの規模を大きくし、河川の洪水流量に匹敵する潮流を発生させることにより、河床を深くし、洪水疎通断面を大きくし河川下流部４の治水効果を高めることが出来る。
さらに、河口部では上流より流出してきた莫大な砂泥が、河道に沈降し河道を浅くし、洪水の疎通能力や船舶の航行に支障が生じる。
このため、河口部の水域で、将来埋め立てや干潟造成が可能な水域を選んで、多空隙を有する堤体（透過構造による堤体）８により囲い締め切られた、別の「海洋の空（ＵＴＳＵＲＯ）」Ｂ（静穏浄化水域）を設置し、潮汐の上げ潮の作用を利用して、河口に流出して来た膨大な河川の泥水を「海洋の空（ＵＴＳＵＲＯ）」ＢおよびＢ′水域９に取り込み、沈降浄化させて、干潟や埋立地を造成し、引き潮時には沈降浄化したうわ水を河道に集めて、河道に潮流を発生させ、さらに河口における河道の掃流力を高め、河道を深く河道を維持し、河口部での洪水の通水断面を常に確保することにより、航路の維持浚渫に寄与する。
さらに、河口の「海洋の空（ＵＴＳＵＲＯ）」Ｂを含む外郭部を囲う堤体を不透過性堤体または半不透過性堤体で堤体８′を設置することにより、外海６への泥水の流出を防止し、河口の汽水域を保持して、河川水域の水産資源を豊富にし、河口部における科道の潮流を増加させ、洪水の疎通能力を高め、航路の維持や治水効果を大きくする。
また、「海洋の空（ＵＴＳＵＲＯ）」Ａによる潮流発生装置の機能を永久的に維持させるためには「海洋の空（ＵＴＳＵＲＯ）」Ａ内に河川の汚濁水の流入を阻止するため、「海洋の空（ＵＴＳＲＯ）」Ａの開放水路３の延長Ｌｂを長くし、Ｌｂ＞Ｖｂ×ｔ×α、Ｖｂ；開放水路の平均流速、ｔ：上げ潮の時間、α：水路の拡散係数、の条件を満足させる必要がある。（したがって、開放水路を「海洋の空（ＵＴＳＵＲＯ）」Ａの汚濁防止水路とも言う。）In order to describe the present invention in more detail, it will be described with reference to the accompanying drawings.
As shown in the plan view of FIG. 1, the water area surrounded by the dam body structure 1 in the water area having a tide level change is called “ocean sky (UTSRO)” and “ocean sky (UTSRO)” A The waterway opening that opens the water area with a waterway extends toward the upstream part of the river, and the tide flow generator by “UTSURO” A that opens in the upstream water area of the river where the tide level changes, the downstream part from the opening. The Lb section is a river controlled by tides. If the conventional river extension Lo is used, the function extension of the river becomes (Lo-Lb) the extension La of the upstream part of the river, and the function extension of the river can be shortened.
In the course of river formation, alluvial plains are formed by outflowing sand and mud. The larger the river is, and the slower the river is, the main river at the estuary is divided into several tributaries and flows into the sea. .
At the estuary of such a tributary 3 is formed a water area enclosed by an impermeable dam body 1 that constitutes the “ocean sky (UTSRO)” A shown in FIG. If the tide level changes in the open sea 6 due to opening to 4, the river flows through the tributaries 3 (open water channels) through the downstream part 4 of the river and repeats “flowing into and out of the sea (UTSURO) A”.
If the natural flow rate Qo of the river is the tide Qc flowing out of the “ocean sky (UTSURO)” A, the water quantity Qb of the downstream portion 4 at the time of the tide is (Qb = Qo + Qc,). The inherent flow rate Qo of the river is limited by the river, but the tide Qc flowing out from the “ocean sky (UTSURO)” A can be increased according to the scale of the “ocean sky (UTSURO)” A. .
By enlarging the scale of “Ocean Sky (UTSURO)” A and constructing “Ocean Sky (UTSURO)” A with a scale comparable to the flood flow of the river, the tidal current generation flow rate Qc The tide flow rate Qb, which is always equivalent to the flood flow rate, will repeatedly flow in and out.
In this way, even if a huge tidal current Qb comparable to a flood flows into the river mouth 4, it is a flow generated by the tide at some point, so it flows under the sea level (THWL or less) and overflows the height of the levee in the land area. There is nothing.
Accordingly, as shown in FIG. 1, by forming “UTSURO” A at the mouth of the tributary 3, the extension Lb of the river downstream portion 4 forms the downstream portion of the river in shape. It seems to be, but functionally it has the characteristics of a strait and a coral. Therefore, if all the conventional rivers are Lo, (Lo-Lb), that is, the upstream river extension La becomes the functional extension of the new river.
Assuming that the river bed height at the upstream of the conventional river is Ho, the conventional river bed gradient Io is (Ho / Lo), and the river bed gradient Ia of the new river is (Ho / (L-Lb)), as shown in FIG. Io <Ia, and the riverbed gradient becomes large.
When the riverbed gradient in the upstream section increases, the flow velocity increases, the tractive force increases, the riverbed is deeply swamped, and the river flood cross section increases. As a result, the ceiling river is gradually eliminated and the flood control capacity is enhanced.
Moreover, in the downstream part 4 of the river, the scale of the “ocean sky (UTSURO)” A shown above is increased, and the river bed is deepened by generating a tidal current comparable to the flood flow of the river, and the flood communication cross section is The water control effect of the river downstream part 4 can be increased by enlarging it.
In addition, the huge sand mud that flows from the upstream in the estuary sinks into the river channel and shallows the river channel, which impedes the ability to communicate floods and ship navigation.
For this reason, another “ocean sky (UTSURO) was selected by selecting a water area that could be reclaimed or constructed in the future in the estuary, and was enclosed by a multi-cavity levee body (perforated levee body) 8. ) ”B (Quietly purified water area) is installed, and by utilizing the action of rising tides, the mud of rivers that have flowed out into the estuary is put into“ UTSURO ”B and B ′ water areas 9. Ingestion and subsidence purification to create tidal flats and landfills.At low tides, the subsidence-purified wow water is collected in the river channel, generating tidal currents in the river channel, and further increasing the channel's sweeping power in the estuary, deepening the river channel By maintaining the cross-section of floods in the estuary, it will contribute to the maintenance dredging of the channel.
Furthermore, the muddy water to the open sea 6 can be obtained by installing a levee body 8 'with an impermeable dam body or a semi-impermeable dam body around the outer wall of the estuary including "UTSURO" B. Spills, keeps estuary brackish water, abundant fishery resources in river basin, increases tide flow in river estuaries, enhances flood communication capacity, greatly enhances channel maintenance and flood control effects To do.
In addition, in order to permanently maintain the function of the tidal current generating device by the “ocean sky (UTSURO)” A, in order to prevent the inflow of polluted water from the river in the “ocean sky (UTSURO)” A, The length Lb of the open water channel 3 of the “Ussoro” (UTSRO) A is lengthened, Lb> Vb × t × α, Vb: average flow velocity of the open water channel, t: time of rising tide, α: diffusion coefficient of the water channel It is necessary to satisfy. (Thus, the open channel is also referred to as the “UTSURO” A pollution control channel.)

産業上の利用の可能性Industrial applicability

河川の河口部では上流部から流出する土砂により、また、近世紀には両岸の埋め立等により河川の延長が徐々に増加し、河川全体の河床勾配が緩くなり、河川の洪水疎通能力が低下してきた。また、河口部での河床が上昇し、舟運や内水排除が困難になっている。
このため、自然のエネルギーを利用し、従来の河川による重力によるエネルギーに加えて、下流部では潮汐のエネルギーを卓越させ、河道の維持浚渫を図り、泥水をきれいにし、泥水の泥を集めて広大な干潟や埋立地を造成するもので、これら実行期間は洪水、高潮等の時を期して、短期に実行されるもので、従来の石油や石炭等の機械による維持浚渫でなく環境にやさしいシステムで、産業上の利用の可能性が大きい。At the estuary of the river, the length of the river gradually increases due to earth and sand flowing out from the upstream, and land reclamation on both banks in the last century. It has declined. In addition, the riverbed at the estuary has risen, making it difficult to transport boats and eliminate internal water.
For this reason, using natural energy, in addition to the energy of gravity by conventional rivers, the tidal energy is prevailing in the downstream, the river channel is maintained, the mud is cleaned, the mud is collected This is a system that is friendly to the environment, rather than being maintained by conventional oil and coal machinery, such as floods and storm surges. Therefore, there is great potential for industrial use.

Claims

潮位変化のある水域で、堤体構造によって囲い締め切られた水域を「海洋の空（ＵＴＳＲＯ）」と言い、「海洋の空（ＵＴＳＲＯ）」Ａの水域を水路で開放する水路口を、河川の上流部に向かって延伸し、潮位変化のある河川上流水域で開放する「海洋の空（ＵＴＳＵＲＯ）」Ａによる潮流発生装置により、開放口より下流部Ｌｂ区間は潮汐の支配する河川となる。従って、従来の河川延長Ｌｏとすれば、河川の機能延長は（Ｌｏ−Ｌｂ）河川上流部の延長Ｌａとなり、河川の機能延長を短くすることが出来る。
このことにより、河川の最上流部の河床高Ｈｏとすれば、従来の河床勾配Ｉｏ（Ｈｏ／Ｌｏ）で、河川上流部の河床勾配は自然に安定勾配Ｉａ（Ｈｏ／（Ｌｏ−Ｌｂ））となり、Ｉｏ＜Ｉａで、河床勾配が大きくなるに従い、河川の流速が大きくなる。このため、河床の掃流力が高められ、河床洗掘により、河床が低下し、深くなり、河川通水断面を大きくし、洪水の疎通能力を高め、河川上流部における治水効果や内水排除効果を高めることにより、河川上流部Ｌａの莫大な河床土砂が泥水として下流に流出する。
さらに、河川の下流部では、「海洋の空（ＵＴＳＵＲＯ）」Ａの規模を大きくして、潮流発生能力を高め、河川の洪水流量に匹敵する潮流を常に発生させることにより、河床の掃流力が高められ、河床が深なり、下流部の河川断面が大きくなり、河川下流部における洪水の疎通能力が高くなることにより、河川下流部Ｌｂの莫大な河床土砂が泥水として下流に流出する。
さらに、河口部では、河川の上流部Ｌａおよび、下流部Ｌｂの流域より流出してきた莫大な泥砂汚濁水による河口沿岸水域の汚濁防止を図りながら、泥水を処理するために、将来干潟や埋め立て可能な水域に多空隙を有する透過構造による堤体８で囲い締め切られた「海洋の空（ＵＴＳＵＲＯ）」Ｂを設置すると共に、「海洋の空（ＵＴＳＵＲＯ）」Ｂの外郭部を含む河口部を囲う堤体８′を設置することにより潮汐作用を利用して、河川上流部から流出し、河口の河道に堆積する泥水を、上げ潮時に「海洋の空（ＵＴＳＵＲＯ）」Ｂ内に取り込み、泥水の泥を沈降浄化させて、干潟や埋立地を造成し、引き潮時には沈降浄化したきれいな上（うわ）水を、河道に集めて潮流を発生させ、河口閉塞を防止し、河道を維持して、洪水の疎通能力を高め、外海６や河口沿岸水域の汚濁水の拡散を防止し、河口部での汽水域を保持し、「海洋の空（ＵＴＳＵＲＯ）」Ａ内に流入する濃塩水の流入を阻止して、「海洋の空（ＵＴＳＵＲＯ）」Ａを含む下流水域の利水効果を高め、河川水域の水産資源を豊富にする。
上記の「海洋の空（ＵＴＳＵＲＯ）」Ａの潮流発生装置の機能を持続させるために、「海洋の空（ＵＴＳＲＯ）」Ａの開放水路３の水路長Ｌｂを長くし、「海洋の空（ＵＴＳＲＯ）」Ａの開放口（河川汚濁水）よりの入潮長Ｌｔより長くすることにより、「海洋の空（ＵＴＳＵＲＯ）」Ａ内２への河川汚濁水の浸入を阻止する。
上記システムを特徴とする「海洋の空（ＵＴＳＵＲＯ）」による潮流発生装置を利用した治水および水利システム。A water area that has been closed by a levee structure in a water area with tide level changes is called “ocean sky (UTSRO)”, and the waterway mouth that opens the water area of “ocean sky (UTSRO)” A through the water channel, The tidal current generating device by “UTSURO” A, which extends toward the upstream and opens in the upstream water area of the river where the tide level changes, makes the tide-dominated river in the downstream Lb section from the opening. Therefore, if the conventional river extension Lo is used, the function extension of the river becomes (Lo-Lb) the extension La of the upstream part of the river, and the function extension of the river can be shortened.
As a result, if the river bed height Ho at the uppermost stream of the river is the conventional riverbed gradient Io (Ho / Lo), the riverbed gradient at the upstream of the river is naturally a stable gradient Ia (Ho / (Lo-Lb)). Therefore, when Io <Ia, the flow velocity of the river increases as the riverbed gradient increases. For this reason, the riverbed scavenging force is increased, and riverbed scouring lowers and deepens the riverbed, enlarges the river cross section, increases flood communication capacity, and controls the river upstream and eliminates inland water. By enhancing the effect, a huge riverbed sediment in the river upstream portion La flows out as muddy water downstream.
Furthermore, in the downstream part of the river, the size of “UTSURO” A is increased to increase the tidal current generation capability, and constantly generate a tidal current that is comparable to the flood flow of the river. Is increased, the river bed is deepened, the river cross section in the downstream part is enlarged, and the flood communication capacity in the downstream part of the river is increased, so that huge riverbed sediment in the downstream part Lb flows out as mud water downstream.
Furthermore, in the estuary, in order to treat the muddy water while preventing the pollution of the estuary coastal water area by the huge mud sand polluted water that has flowed out from the river basin of the upstream part La and the downstream part Lb, it is possible to make mudflats and landfill in the future A “marine sky (UTSURO)” B enclosed by a levee body 8 with a permeation structure having multiple voids in a clear water area is installed, and the estuary including the outer part of the “marine sky (UTSURO)” B is enclosed By installing the levee body 8 ', using the tide action, the mud that flows out from the upstream of the river and accumulates in the river channel at the estuary is taken into the "UTSURO" B during the rising tide, and mud By subsidizing and purifying, creating tidal flats and landfills, and at the time of tide, the clean and clean water is collected in the river channel to generate a tide, preventing the estuary clogging, maintaining the river channel, Communication ability To prevent the spread of polluted water in the open sea 6 and the estuary coastal water area, to maintain the brackish water area in the estuary, and to prevent the inflow of concentrated salt water flowing into the “UTSURORO” A, Enhance the water-use effect of downstream waters, including the ocean sky (UTSURO) A, and enrich marine resources in river waters.
In order to maintain the function of the tidal current generating device of the “ocean sky (UTSURO)” A, the channel length Lb of the open channel 3 of the “ocean sky (UTRO)” A is increased, and the “ocean sky (UTRO)” ) "Intrusion of river polluted water into 2 in the" ocean sky (UTSURO) "A is prevented by making it longer than the tidal length Lt from the opening of A (river polluted water).
A flood control and irrigation system using a tidal current generating device by the “ocean sky (UTSURO)” characterized by the above system.