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Design of Erosion-Protection of Flood Plain and Side Slope of Levee by Vegetation

河滩及堤岸边坡植被防冲刷设计

基本信息

批准号：
07555452
负责人：
TSUJIMOTO Tetsuro
金额：
$ 0.7万
依托单位：
Kanazawa University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B)
财政年份：
1995
资助国家：
日本
起止时间：
1995 至 1996
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-07555452/
关键词：
Flow with vegetation Flood plain Side slope of levee Erosion Critical tractive force Turbulent measurement Nemerical analysis Close-to-nature river improvement 堤防法面保護掃流力耐侵食能野外計測

项目摘要

Recently, river improvement should be planned to refine various functional aspects of rivers such as flood control, more efficient water resources utilization, recreational or leisure usage of rivers, well-conserved ecological situation, aquatic habitat and so on. As a compromise, erosion-protection works of flood plain and/or side slope of levee (embankment) by vegetation cover was investigated instead of more rigid protection works.When the sand bed is covered by vegetation layr, the Reynolds stress in the vegetation layr is effectively suppressed due to drag by vegetation. The flow with vegetation was described numerically by taking account of the effect of vegetation. In case of flexible vegetation, the deformation of individual plants and the flow over deformed vegetation layr were solved simultaneously. The method how to measure the flexural rigidity, which governs the deformation of the plants, in the fields was also studied.Furthermore, the effects of geometry of cross-section, which often have flood plain and side slopes, on the erosion-protection efficiency of vegetation layr were investigated by using the three-dimensional numerical analysis of flow with vegetation. The results of calculation obtained by changing the parameters systematically were summarized to be conveniently used for design of erosion-protection works with vegetation cover.

近期，河流整治规划应细化河流的各个功能方面，如防洪、更有效的水资源利用、河流的娱乐或休闲利用、良好的生态状况、水生栖息地等。作为一种妥协，研究了植被覆盖对洪泛平原和（或）堤（堤）坡的侵蚀防护工程，而不是更严格的防护工程。当砂层被植被层覆盖时，植被层内的雷诺应力受到植被的阻力有效抑制。考虑植被对水流的影响，对有植被的水流进行了数值描述。在柔性植被情况下，同时求解单株的变形和变形植被层上的流动。研究了田间控制植株变形的抗弯刚度的测量方法。在此基础上，采用三维植被流数值分析方法，研究了具有洪泛平原和边坡的断面几何形状对植被层防侵蚀效率的影响。系统地总结了通过改变参数得到的计算结果，以便于有植被覆盖的防腐蚀工程的设计。