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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，河流治理应规划细化河流的各个功能方面，如防洪、更高效地利用水资源、河流的康乐或休闲利用、养护良好的生态状况、水生栖息地等。作为一种折衷方案，研究了漫滩和(或)堤(堤)边坡的植被覆盖防护工程，而不是更刚性的防护工程，当沙层被植被覆盖时，植被层中的雷诺应力被有效地抑制。考虑植被的影响，对有植被的水流进行了数值描述。在植被柔性的情况下，同时求解了植物个体的变形和变形植被层上的水流。研究了控制植物田间变形的抗弯刚度的测量方法，并利用植被流的三维数值分析方法，研究了常有漫滩和坡面的断面几何形状对植被层防冲效果的影响。总结了系统改变参数的计算结果，可方便地用于植被覆盖防护工程的设计。