JP4357895B2 - Earth retaining for artificial tidal flats - Google Patents

Earth retaining for artificial tidal flats Download PDF

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JP4357895B2
JP4357895B2 JP2003282648A JP2003282648A JP4357895B2 JP 4357895 B2 JP4357895 B2 JP 4357895B2 JP 2003282648 A JP2003282648 A JP 2003282648A JP 2003282648 A JP2003282648 A JP 2003282648A JP 4357895 B2 JP4357895 B2 JP 4357895B2
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tidal flat
artificial tidal
artificial
earth retaining
submerged
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JP2005048496A (en
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進 金山
浩太 中瀬
裕之 岩本
知忠 岡村
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Penta Ocean Construction Co Ltd
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Penta Ocean Construction Co Ltd
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Description

本発明は人工干潟用土留め、特に、干潟材の洗堀を防止できる人工干潟用土留めに関するものである。   The present invention relates to an earth retaining for artificial tidal flats, and more particularly, to an earth retaining for artificial tidal flats that can prevent scouring of tidal flat materials.

干潟材、特に粘性土より成る干潟材の流出を防ぐため潜堤状の土留めを人工干潟の海側に隣接して設けることは特許文献１に示すように既知である。 As shown in Patent Document 1, it is known to provide a submerged dike-shaped retaining ring adjacent to the sea side of an artificial tidal flat in order to prevent outflow of tidal flat materials, in particular, tidal flat materials made of cohesive soil .

然しながら上記従来の手段では土留めによって波浪の高さを減衰することができず図４に示すように、人工干潟の干潟材１の海側に隣接して形成された潜堤２を波３が乗り越えて干潟材１上に達し、この場合砕波を伴うことも多く、これによって干潟材１の局所部分４が洗掘されるようになり、この洗掘による変形により干潟材１の流失が広範囲に亘るようになる欠点があった。   However, with the above-mentioned conventional means, the height of the waves cannot be attenuated by the earth retaining, and as shown in FIG. 4, the waves 3 pass through the submerged levee 2 formed adjacent to the sea side of the tidal flat material 1 of the artificial tidal flat. Overcoming the tideland material 1 in this case, often accompanied by breaking waves, this causes the local portion 4 of the tideland material 1 to be scoured. There was a drawback that it would span.

また、干潟はその存在性格上干潟内部に潮間帯があるが、土留めを越えて波浪が干潟内部に進入した場合、防砂シートがめくれ上がり、土留めを越えて干潟材が流出するようになる欠点があった。   In addition, the tideland has an intertidal zone in the inside of the tidal flat, but when waves enter the inside of the tidal flat beyond the retaining ring, the sand prevention sheet rises and the tidal flat material flows out beyond the retaining ring. There were drawbacks.

本発明者は種々実験研究の結果、波浪が高ければ潜堤２を乗り越える海水の量が多くなり、また、洗掘量も多くなること、及び、土留めの透水性が大きければそれだけ波浪を減衰できることを見出した。   As a result of various experimental studies, the present inventor has found that the amount of seawater that goes over the submerged levee 2 increases when the waves are high, and the amount of scouring also increases. I found out that I can do it.

本発明はこのような知見をもとになされたものである。     The present invention has been made based on such knowledge.

本発明の人工干潟用土留めは、海側から人工干潟側に向って互いに隣接して配置された、３以上の潜堤部分より成り、上記潜堤部分のうちの海側のものの透水性が最大で、他の潜堤部分の透水性が人工干潟側に向って順次小さくなることを特徴とする。 The earth retaining for artificial tidal flats of the present invention is composed of three or more submerged levee portions arranged adjacent to each other from the sea side toward the artificial tidal flat side, and the water permeability of the sea side of the submerged levee portion is the maximum. Thus, the water permeability of other submerged dike portions is gradually reduced toward the artificial tidal flat.

また、本発明の人工干潟用土留めは、人工干潟の海側端部上面とこの海側端部に隣接する上記潜堤部分の上面が保護層によって覆われていることを特徴とする。   In addition, the artificial tidal flat retainer according to the present invention is characterized in that the upper surface of the artificial tideland at the sea side end and the upper surface of the submerged dam adjacent to the sea side end are covered with a protective layer.

本発明の人工干潟用土留めによれば、波が干潟に達する前に土留め上でその波高が減衰し、干潟内に侵入する波浪が小さくなるため干潟材の洗掘と流出が防止されるようになる。   According to the artificial tideland retaining ring of the present invention, the wave height is attenuated on the dam before the wave reaches the tideland, and the waves entering the tidal flat are reduced, so that the scouring and outflow of the tidal flat material is prevented. become.

以下図面によって本発明の実施例を説明する。   Embodiments of the present invention will be described below with reference to the drawings.

本発明の第１の実施例においては図１に示すように人工干潟の干潟材１の海側に隣接して、海側から干潟材１側に向って延びる潜堤２を配置して土留めとし、この潜堤２を図２に示すように長さ方向に隣接する複数の例えば４つの潜堤部分２ａ〜２ｄによって構成し、第１の潜堤部分２ａを空隙の一番大きい材料、即ち透水性の一番大きいものとし、他の潜堤部分２ｂ〜２ｄの材料はその空隙が順次に小さくなる材料、即ち透水性が順次に小さくなるものとする。 In the first embodiment of the present invention, as shown in FIG. 1, a submerged levee 2 extending from the sea side toward the tidal flat 1 is arranged adjacent to the sea side of the tidal flat 1 of the artificial tidal flat. The submerged dike 2 is constituted by a plurality of, for example, four submerged dike portions 2a to 2d adjacent in the length direction as shown in FIG. 2, and the first submerged dike portion 2a is made of a material having the largest gap, that assumed largest water permeability, the material of the other Sentsutsumi parts 2b~2d sequentially reduced material a gap therebetween, i.e., it is assumed that the water permeability is sequentially reduced.

本発明の人工干潟用土留めは上記のような構成であるから透水率が潜堤２を構成する第１の部分で最大となり、波高が大幅に減衰され、次いでこれより透水率が小さい第２・・第４の部分で更に減衰され波浪は図２に示すように潜堤２上で干潟材１側に向って次第に小さくなり干潟材１に達する波は無くなるか、または極めて小さくなる。また、不連続な動水勾配の発生も抑制されるようになる。従って干潟材１の洗掘や吸収、流出を未然に防ぎ得るようになる。   Since the artificial tidal flat retainer of the present invention has the above-described configuration, the water permeability is maximized in the first portion constituting the submerged levee 2, the wave height is greatly attenuated, and then the water permeability is smaller. The wave is further attenuated in the fourth portion, and the waves gradually decrease toward the tidal flat material 1 side on the submerged dike 2 as shown in FIG. 2, and the waves reaching the tidal flat material 1 disappear or become extremely small. Moreover, generation | occurrence | production of a discontinuous hydrodynamic gradient comes to be suppressed. Therefore, scouring, absorption, and outflow of the tidal flat material 1 can be prevented in advance.

本発明の第２の実施例においては図３に示すように上記干潟材１の海側端部上面の所定幅とこれに隣接する上記第４の潜堤部分２ｄの上面の少なくとも一部に保護層５を被せ、波浪による干潟材１の洗掘を完全に防ぎ得るようにする。   In the second embodiment of the present invention, as shown in FIG. 3, a predetermined width of the upper surface of the sea-side end of the tidal flat material 1 and at least a part of the upper surface of the fourth submerged portion 2d adjacent thereto are protected. The layer 5 is covered so that the scouring of the tidal flat material 1 by waves can be completely prevented.

この保護層５としては干潟材１と物性が類似したもの、例えばシルト層や造粒固化層とする。これらは袋やマット状としても良い。また、干潟材１に洗掘が生じた場合この洗掘に応じて上記保護層５が干潟材１の表面に沿って変形し常時干潟材１の表面を覆うことができるようにするのが好ましい。   The protective layer 5 is similar to the tidal flat material 1 such as a silt layer or a granulated solidified layer. These may be bags or mats. Further, when scouring occurs in the tidal flat material 1, it is preferable that the protective layer 5 is deformed along the surface of the tidal flat material 1 in accordance with this scouring so that the surface of the tidal flat material 1 can always be covered. .

本発明の土留めを人工干潟に用いれば人工干潟を波浪から完全に守り、長期間維持できるようになる。   If the earth retaining of the present invention is used for an artificial tidal flat, the artificial tidal flat can be completely protected from waves and can be maintained for a long time.

本発明の人工干潟用土留めを示す説明図である。（実施例１）It is explanatory drawing which shows the earth retaining for artificial tidal flats of this invention. Example 1 本発明の人工干潟用土留めの他の例を示す説明図である。It is explanatory drawing which shows the other example of the earth retaining for artificial tidal flats of this invention. 本発明の人工干潟用土留めの更に他の例を示す説明図である。（実施例２）It is explanatory drawing which shows the further another example of the earth retaining for artificial tidal flats of this invention. (Example 2) 従来の人工干潟用土留めの説明図である。It is explanatory drawing of the conventional earth retaining for artificial tidal flats.

符号の説明Explanation of symbols

１ 干潟材
２ 潜堤
２ａ 部分
２ｂ 部分
２ｃ 部分
２ｄ 部分
３ 波
４ 局所部分
５ 保護層 1 Tidal Flat 2 Submarine 2a Part 2b Part 2c Part 2d Part 3 Wave 4 Local Part 5 Protective Layer

Claims (2)

海側から人工干潟側に向って互いに隣接して配置された、３以上の潜堤部分より成り、上記潜堤部分のうちの海側のものの透水性が最大で、他の潜堤部分の透水性が人工干潟側に向って順次小さくなることを特徴とする人工干潟用土留め。 Consisting of three or more submerged levee parts arranged adjacent to each other from the sea side to the artificial tidal flat side, the water permeability of the sea side of the submerged levee part is maximum , and the water permeability of other submerged levee parts Suspension for artificial tidal flats, characterized by decreasing properties toward the artificial tidal flat side. 人工干潟の海側端部上面とこの海側端部に隣接する上記潜堤部分の上面が保護層によって覆われていることを特徴とする請求項１記載の人工干潟用土留め。   2. The artificial tidal flat earth retaining according to claim 1, wherein the upper surface of the artificial tidal flat is covered with a protective layer on the upper surface of the sea side edge and the upper surface of the submerged levee adjacent to the sea end.
JP2003282648A 2003-07-30 2003-07-30 Earth retaining for artificial tidal flats Expired - Fee Related JP4357895B2 (en)

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JP4357895B2 true JP4357895B2 (en) 2009-11-04

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