The Function of Flood Control by Vegetation in Stream

河流植被的防洪作用

• 批准号: 06680421
• 负责人: AMADA Takaaki
• 金额: $ 0.96万
• 依托单位: University of Tsukuba
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for General Scientific Research (C)
• 财政年份: 1994
• 资助国家: 日本
• 起止时间: 1994 至 1995
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-06680421/
• 关键词: non-uniform flow; flood flow; vegetation in stream; dead water zone; land utilization; function of flood control; 砂防施設; 魚道; 景観; 渓流生態環境

People's demands for nature seem to be on the increase in recent years. It is expected that the vegetation in stream have a function of sedimentation as they can be hydraulically regarded as a group of roughness, thus performing to reduce the velocity of flow.However, the function of the flow resistance and sedimentation by vegetation has not been estimated yet.The points of this study are as below.1. Transition of the river bed utilization2. Influence of the vegetation to fluctuation of river bed3. Influence of the vegetation to flood controlIt became clear that shear stress in the stream flow with vegetation can be estimated accurately.As a result when the percentage of area occupied by vegetation is large, the coefficient of roughness increase and the fluctuatin of river bed is reduced.Therefore it is understood that the vegetation has a function to fix river bed.

近年来，人们对自然的需求似乎在增加。由于河流中的植被在水力学上可以看作是一组粗糙度，从而起到了降低水流流速的作用，因此人们期望河流中的植被具有泥沙作用，但植被对水流阻力和泥沙的作用还没有被估算出来。河床利用的过渡2。植被对河床涨落的影响植被对防洪的影响研究表明，植被对河流水流的剪切力有较高的估算精度，当植被所占面积较大时，糙率增大，河床波动减小，从而认识到植被具有固定河床的作用。