JP2636120B2 - Sand stabilization method - Google Patents
Sand stabilization methodInfo
- Publication number
- JP2636120B2 JP2636120B2 JP4323746A JP32374692A JP2636120B2 JP 2636120 B2 JP2636120 B2 JP 2636120B2 JP 4323746 A JP4323746 A JP 4323746A JP 32374692 A JP32374692 A JP 32374692A JP 2636120 B2 JP2636120 B2 JP 2636120B2
- Authority
- JP
- Japan
- Prior art keywords
- sand
- drainage layer
- beach
- offshore
- shoreline
- 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.)
- Expired - Lifetime
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
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A10/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE at coastal zones; at river basins
Landscapes
- Revetment (AREA)
Description
【０００１】[0001]
【産業上の利用分野】本発明は、海岸または湖岸の水際
線付近において、静穏時には移動している底質を汀線付
近に堆積させ、荒天時には汀線付近にある底質の沖への
移動を抑えて海岸または湖岸の侵食を防止するための方
法に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is to deposit sediment moving near the shoreline of a shore or lake shore during calm and to prevent the sediment near the shoreline from moving offshore during stormy weather. And methods for preventing coastal or lake shore erosion.
【０００２】[0002]
【従来の技術】海岸または湖岸の水際線の地形は、波や
流れの影響を受けて底質（主として砂）が移動するため
に絶えず変化している。従来、水際線の地形を安定化す
るために、水際線に直角に突堤を、水際線と平行に離岸
堤を水中に設置する工法が古くから用いられている。こ
れらの構造物はダムの建設等の治水事業や、沿岸部の埋
立・港湾等の建設によって浜への砂の供給が減少した
り、連続性が絶たれたことによる海岸・湖岸の侵食を防
止するものであり、荒天時の急激な侵食を防止するもの
ではない。また、水面上に構造物があるため景観上も好
ましいとはいえない。離岸堤の天端高を水面よりも低く
した潜堤工法は景観上は優れているものの建設費用が高
くなることや、小型船舶の航行において問題がある。一
方、構造物を建設せずに、人工的に底質（砂）を補給す
る工法があるが、この工法は継続的に砂補給を行うか、
他の構造物と併用しないと地形安定効果は少ない。BACKGROUND OF THE INVENTION Coastal or lake shore topography is constantly changing due to the movement of sediment (primarily sand) under the influence of waves and currents. Conventionally, in order to stabilize the shoreline topography, a method of installing a jetty perpendicular to the shoreline and a breakwater in the water in parallel with the shoreline has been used for a long time. These structures prevent floods such as dam construction and construction of coastal land reclamation and harbors, etc., thereby reducing the supply of sand to the beach and preventing coastal and lake erosion due to the loss of continuity. It does not prevent rapid erosion in stormy weather. In addition, since there are structures on the water surface, it cannot be said that it is preferable in terms of landscape. The submerged levee method, in which the crest height of the breakwater is lower than the water surface, is superior in view of the landscape, but has a problem in that the construction cost is high and the navigation of small boats is problematic. On the other hand, there is a method of artificially replenishing sediment (sand) without constructing a structure.
The terrain stabilization effect is small unless used in combination with other structures.
【０００３】また最近、水際線付近の地下水位と地形変
化の関係についての研究が進められ、波の遡上・浸透に
よって上昇した砂浜内の地下水位を下げることによって
侵食が軽減されることが分かってきている。そして、波
高が大きな荒天時に地下水位をポンプによって強制的に
下げ、侵食を軽減するとともに、波高が小さな静穏時に
堆積を促進させるサブサンドフィルター工法が考えられ
（一例として特公平３-78447号公報参照）、室内実験、
現地調査が実施され効果が確認されている。[0003] Recently, a study on the relationship between the groundwater level near the shoreline and topographical changes has been advanced, and it has been found that erosion can be reduced by lowering the groundwater level in a sandy beach that has risen due to the ascent and penetration of waves. Is coming. A sub-sand filter method is conceivable in which the groundwater level is forcibly lowered by a pump during high stormy weather to reduce erosion and promote sedimentation when calmness is low and quiet (for example, see Japanese Patent Publication No. 3-78447). ), Laboratory experiments,
Field surveys have been conducted and the effects have been confirmed.
【０００４】[0004]
【発明が解決しようとする課題】しかしながら、このサ
ブサンドフィルター工法は、地下水位を下げるために常
に揚水ポンプを運転する必要があり、運転コストの面で
問題がある。However, in this sub-sand filter method, it is necessary to always operate a pump for lowering the groundwater level, which is problematic in terms of operating costs.
【０００５】本発明は、上記従来の問題を解決するため
になされたもので、荒天時の侵食を軽減し、静穏時に堆
積を促進するための運転コストが不要な地下水位低下法
を提供することを目的とするものである。SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned conventional problems, and it is an object of the present invention to provide a method for lowering the groundwater level which does not require any operating cost for reducing erosion in stormy weather and promoting sedimentation in calm weather. It is intended for.
【０００６】[0006]
【課題を解決するための手段】上記の目的を達成するた
めの本発明の構成について、実施例に対応する図面を参
照して説明すると、請求項１の方法は、海岸または湖岸
の水際付近において、その砂浜１中に、浜より海中また
は湖中に至る排水層２を設け、浜に遡上して砂中に浸透
した水を、排水層２より沖側に自然排水させるようにし
たことを特徴とするものである。The structure of the present invention for achieving the above object will be described with reference to the drawings corresponding to the embodiments. A drainage layer 2 extending from the beach to the sea or to the lake is provided in the sandy beach 1 so that water permeating into the sand ascending to the beach is naturally drained offshore from the drainage layer 2. It is a feature.
【０００７】また、請求項２の方法は、請求項１の方法
において、排水層２の沖側端に、沖側への砂の移動を抑
える多孔質材料で形成した砂止め堤５を設けることを特
徴とするものである。According to a second aspect of the present invention, in the method of the first aspect, a dike 5 formed of a porous material for suppressing movement of sand offshore is provided at the offshore end of the drainage layer 2. It is characterized by the following.
【０００８】また、請求項３の方法は、請求項１または
２の方法において、上記排水層２と砂１との境に、排水
層２の目づまりを防ぐためのフィルター材４を敷設する
ことを特徴とするものである。According to a third aspect of the present invention, in the method of the first or second aspect, a filter material 4 for preventing clogging of the drainage layer 2 is laid at a boundary between the drainage layer 2 and the sand 1. It is a feature.
【０００９】[0009]
【作用】排水層２を砂浜１内に設けることによって、波
が遡上後砂浜表面から浸透した海水（水）が透水性の高
い層を沖に向かって流れ、水際線付近の平均水位および
砂浜１中の地下水位の上昇は抑えられる。その結果、荒
天時には水際線付近の侵食が軽減され、静穏時には、水
際線付近への堆積が促進される。[Function] By providing the drainage layer 2 in the sandy beach 1, seawater (water) penetrating from the surface of the sandy beach after the wave goes up flows through the highly permeable layer to the offshore, and the average water level near the shoreline and the sandy beach The rise of the groundwater level during 1 can be suppressed. As a result, erosion near the shoreline is reduced during stormy weather, and deposition near the shoreline is promoted during calm.
【００１０】[0010]
【実施例】以下、本発明の実施例について図面を参照し
て説明する。図１は本発明の一実施例を示す横断面図、
図２は同縦断面図である。１は海岸または湖岸の砂浜
層、Ｍ、Ｗ、Ｌは海水または湖水の平均水位で、その水
際線は波や流れの状態により変化し、また、通常、水際
付近の地形は、波や流れの影響を受けて底質すなわち砂
等が移動するために絶えず変化するものである。Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a cross-sectional view showing one embodiment of the present invention,
FIG. 2 is a longitudinal sectional view of the same. 1 is a beach layer on the coast or lake shore, M, W, and L are average water levels of seawater or lake water, and the shoreline changes depending on the state of waves and currents. Under the influence, sediment, that is, sand and the like, constantly changes due to movement.
【００１１】本発明では、水際付近の地形の変化、特に
侵食は、波の遡上、浸透によって砂浜１内の地下水位の
上昇が大きな原因をなしているとの知見により、その地
下水位を下降させるための方法を講ずるものである。す
なわち、砂浜１に排水層２を設置する。According to the present invention, the change in the topography near the water's edge, particularly the erosion, is found to be caused by the rise of the groundwater level in the sandy beach 1 due to the rise and penetration of the waves, and the groundwater level is lowered. We will take measures to make it happen. That is, the drainage layer 2 is installed on the sandy beach 1.
【００１２】排水層２は、石あるいはプラスチック等の
多孔質材料により、水際線より陸部側にある後浜ａから
水際線を越した海中（湖中）に至る長さにわたり、上下
所要の厚さに形成され、かつ、その陸側端部から沖側端
部まで下がり勾配をなすように形成される。そして、排
水層２の設置高さは、後浜で平均水位レベル以下とする
のが好ましい。また、排水層２は、図２に示すように、
安定化を必要とする砂浜の全長（水際線に沿った方向）
にわたって形成するか、或は、図３に示すように、砂浜
の横断方向に間隔をおいて多数の排水層２ａ，２ｂ…２
ｎを並設する。また、この場合、図４に示すように、各
排水層２ａ…２ｎは、多孔質の透水ブロック３，３を連
設して形成することもできる。The drainage layer 2 is made of a porous material such as stone or plastic. It is formed so as to have a downward slope from its landside end to its offshore end. It is preferable that the installation height of the drainage layer 2 be equal to or lower than the average water level at the rear beach. Also, as shown in FIG.
The total length of the beach requiring stabilization (along the shoreline)
3 or, as shown in FIG. 3, a plurality of drainage layers 2a, 2b.
n are juxtaposed. Further, in this case, as shown in FIG. 4, each of the drainage layers 2a to 2n can be formed by connecting porous water-permeable blocks 3 and 3 in a row.
【００１３】図５は本発明の他の実施例を示したもの
で、排水層２の海中（湖中）にのぞむ沖側端に、砂浜層
１より上方に高く隆起した砂止め堤５が設けられる。こ
の砂止め堤５は石やプラスチック等の多孔質材料を積重
ねて形成するか、多孔質の透水ブロックを載設して形成
される。それによって、砂の移動により生じる沖側端の
排水層２の目詰まりを防止するとともに、それよりも沖
側への砂の移動が抑えられることになる。また、上記の
各排水層２，２ａ…２ｎの外側、つまり砂１との境に
は、図２、図３、図５に示すように、排水層の目詰まり
を防ぐために、網材やキャンパス地等によるフィルター
材４を施設することができる。FIG. 5 shows another embodiment of the present invention. At the offshore end of the drainage layer 2 looking into the sea (in the lake), there is provided an embankment embankment 5 rising above the sandy beach layer 1. Can be The sand embankment 5 is formed by stacking porous materials such as stones and plastics, or by mounting a porous water-permeable block. This prevents clogging of the drainage layer 2 at the offshore end caused by the movement of sand, and further suppresses the movement of sand to the offshore side. The outside of each of the drainage layers 2, 2a... 2n, that is, the boundary with the sand 1, as shown in FIGS. A filter material 4 based on the ground or the like can be provided.
【００１４】[0014]
【発明の効果】以上説明したように、本発明によれば、
排水層を砂浜中に設けたことにより、波が遡上した後砂
浜表面から浸透した海水（水）が、排水層を通り海中
（水中）に向かって流れることになり、水際線付近の平
均水位及び砂浜中の地下水位の上昇が抑えられることに
なる。その結果、荒天時には水際線付近の侵食が軽減さ
れ、静穏時には、水際線付近への砂の堆積が促進され
る。また、本発明は、排水層を設置するだけで、他に特
別な構造物や装置類を必要としないので、経済性が著し
く向上される。As described above, according to the present invention,
By providing the drainage layer in the sandy beach, the seawater (water) that has permeated from the surface of the sandy beach after the wave ascends flows through the drainage layer toward the sea (underwater), and the average water level near the shoreline And the rise of the groundwater level in the sandy beach will be suppressed. As a result, erosion near the shoreline is reduced during stormy weather, and accumulation of sand near the shoreline is promoted during calm. In addition, according to the present invention, since only a drainage layer is installed and no special structure or equipment is required, economic efficiency is remarkably improved.
【図１】本発明の一実施例を示す横断面図である。FIG. 1 is a cross-sectional view showing one embodiment of the present invention.
【図２】同排水層の一実施例を示す縦断面図である。FIG. 2 is a longitudinal sectional view showing one embodiment of the drainage layer.
【図３】同他の実施例を示す縦断面図である。FIG. 3 is a longitudinal sectional view showing another embodiment.
【図４】同さらに他の実施例を示す縦断面図である。FIG. 4 is a longitudinal sectional view showing still another embodiment.
【図５】本発明の他の実施例を示す横断面図である。FIG. 5 is a cross-sectional view showing another embodiment of the present invention.
１ 砂浜（砂） ２，２ａ〜２ｎ 排水層 ３ 透水コンクリート ４ フィルター材 ５ 砂止め堤 ６ 地盤等 ａ 後浜 DESCRIPTION OF SYMBOLS 1 Sandy beach (sand) 2, 2a-2n Drainage layer 3 Permeable concrete 4 Filter material 5 Sand embankment 6 Ground etc. a Back beach
───────────────────────────────────────────────────── フロントページの続き 審査官 小野 忠悦 (56)参考文献 特開 昭62−33913（ＪＰ，Ａ) 実開 平２−6725（ＪＰ，Ｕ) ──────────────────────────────────────────────────続 き Continuing from the front page Examiner Tadayoshi Ono (56) References JP-A-62-33913 (JP, A) JP-A-2-6725 (JP, U)
Claims (3)
の砂浜中に、浜より海中または湖中に至る排水層を設
け、浜に遡上して砂中に浸透した水を、排水層により沖
側に自然排水させるようにしたことを特徴とする、砂浜
の安定化方法。1. A drainage layer extending from the beach to the sea or to the lake near the shore or the shore of a lake, and water penetrating into the sand ascending to the beach is drained offshore by the drainage layer. A method of stabilizing a sandy beach, characterized by allowing natural drainage of water.
動を抑える多孔質材料で形成した砂止め堤を設けること
を特徴とする、請求項１記載の砂浜の安定化方法。2. A method for stabilizing a sand beach according to claim 1, further comprising: providing an embankment formed of a porous material for suppressing movement of sand offshore at an offshore end of the drainage layer. .
まりを防ぐためのフィルター材を敷設することを特徴と
する、請求項１または２記載の砂浜の安定化方法。3. The method for stabilizing a sand beach according to claim 1, wherein a filter material for preventing clogging of the drainage layer is laid at a boundary between the drainage layer and the sand.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4323746A JP2636120B2 (en) | 1992-11-10 | 1992-11-10 | Sand stabilization method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4323746A JP2636120B2 (en) | 1992-11-10 | 1992-11-10 | Sand stabilization method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH06200508A JPH06200508A (en) | 1994-07-19 |
| JP2636120B2 true JP2636120B2 (en) | 1997-07-30 |
Family
ID=18158160
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP4323746A Expired - Lifetime JP2636120B2 (en) | 1992-11-10 | 1992-11-10 | Sand stabilization method |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2636120B2 (en) |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2654509B2 (en) * | 1994-01-20 | 1997-09-17 | 運輸省港湾技術研究所長 | Beach stabilization device |
| JP4348420B2 (en) * | 1999-10-19 | 2009-10-21 | 独立行政法人港湾空港技術研究所 | Sand beach stabilization method and sand beach stabilization device |
| JP4286415B2 (en) * | 2000-01-18 | 2009-07-01 | 日鐵住金建材株式会社 | Permeability and drainage facilities for beach stabilization structure |
| JP5152738B2 (en) * | 2006-09-27 | 2013-02-27 | 国立大学法人豊橋技術科学大学 | Anti-wave stabilization method for seabed using permeable column |
| KR101378758B1 (en) * | 2012-08-29 | 2014-03-27 | 에스비비 주식회사 | the constrution method of porous structrue with absorption of shock against wave power and force of moving fluid |
| CN109914344A (en) * | 2019-02-23 | 2019-06-21 | 鲁东大学 | A kind of water front sand dune safeguard structure |
-
1992
- 1992-11-10 JP JP4323746A patent/JP2636120B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH06200508A (en) | 1994-07-19 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| EP0108269B1 (en) | A method of causing sedimentation of sedimentary solid material transported in a body of water, such as a lake, a sea, or an ocean | |
| US10557238B2 (en) | Lost sand collecting apparatus for preventing coastal erosion | |
| JP2636120B2 (en) | Sand stabilization method | |
| JPH04504151A (en) | Permeable breakwater | |
| Burcharth et al. | Types and functions of coastal structures | |
| EP1034334B1 (en) | A method for coastal protection and a pressure equalization module for use in this connection | |
| Tanaka et al. | Topographic change resulting from construction of a harbor on a sandy beach: Kashima Port | |
| JP2008223446A (en) | Route burial preventing method and port facility preventing burial | |
| EP0655535B1 (en) | Method and apparatus for dredging a trench in a water bed | |
| JP3057519B2 (en) | Fluid control means | |
| JP4036315B2 (en) | Sand beach stabilization and seawater purification methods | |
| US20170268191A1 (en) | Modular shell reef for erosion abatement | |
| JP4362099B2 (en) | Jetty to control drifting sand | |
| Russell | The Coast of Louisiana | |
| WO1995028527A1 (en) | A method of stabilizing a coast | |
| JP4229441B2 (en) | Artificial leaf with adjustable buoyancy | |
| JP2001107332A (en) | Artificial tideland and creating method therefor | |
| JPH0988034A (en) | Increase method of sand beach | |
| JP2005002737A (en) | Sand depositing construction method in seashore | |
| JP4348420B2 (en) | Sand beach stabilization method and sand beach stabilization device | |
| JPH06101217A (en) | Foundation for levee body | |
| Davis | USA--Mississippi and Alabama | |
| JPH04136311A (en) | Bottomless sea area control structure of plural row type | |
| JP3310510B2 (en) | breakwater | |
| ALDEK | LCNGARD TUBE APPLICATIONS MANUAL |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EXPY | Cancellation because of completion of term |