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.

最近，应该计划改善河流的各种功能方面，例如防洪，更有效的水资源利用，娱乐或休闲使用河流，保存良好的生态状况，水生栖息地等。作为妥协，研究了植被覆盖的堤防平原和/或侧面斜坡的侵蚀保护作品，而不是更严格的保护作品。当植被层覆盖沙床时，植被中的雷诺（Reynolds layr）覆盖了植被中的雷诺（Reynolds Layr）的压力。通过考虑植被的作用来描述带有植被的流量。在柔性植被的情况下，同时解决了单个植物的变形和变形植被的流动。还研究了如何测量控制植物变形的弯曲刚度的方法，还研究了田间的弯曲刚度。经常使用与植被流量的三维数字分析一起研究了横截面几何形状对植被layr的侵蚀效率的影响。总结通过系统地更改参数获得的计算结果，可方便地用于设计植被覆盖的侵蚀保护作品。