Study on non-sampling field meant system of sediment discharge using hydrophone

无采样场意味着水听器排沙系统研究

基本信息

批准号：
14360080
负责人：
MIYAMOTO Kuniaki
金额：
$ 5.89万
依托单位：
University of Tsukuba
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B)
财政年份：
2002
资助国家：
日本
起止时间：
2002 至 2004
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-14360080/
关键词：
monitaring of sedimen discharge bed load hydrophone critical tractive force stochastic model pick up rate sediment laden flow 流砂量観測

项目摘要

The aim of this study is to develop an estimating method of sediment discharge using a hydrophone to detect the impacts of sediment particles to the hydrophone According to farmer studies, it is known that the amplitude of the sound due to collisions would be in proportion to momentum of moving sediment In case of bed load, the movement of sediment particles has a statistical property. Therefore, we may determine a transfer role from statistics of amplitudes at collisions to numbers of sediment particles. As results, followings are pointed out.(1)Statistical property of amplitudes strongly depends on diameter of sediment.(2)It is important to know the velocity of flow near the bed or shear velocity. To get the velocity near the bed, a flat faced two dimensional electromagnetic velocity meter attached on the rigid bed such as a top of a consolidation dam. Is useful(3)It is also important to know the limit to apply the estimating method. The limit can be evaluated non-dimensional shear stress and the criteria depend on the bed gradient.According to above discussion, we developed a numerical simulation model of movement and repulsion of sediment particle including riverbed configuration, and discussed the way to determine the transfer matrix from acoustic signal (amplitude) to sediment discharge. We also discuss the integrated system to observe the runoff process of rainfall and sediment in a catchment area.

本研究的目的是开发一种泥沙排放估算方法，使用水听器来检测泥沙颗粒对水听器的影响。根据农民研究，已知碰撞产生的声音幅度与动量成正比移动沉积物的影响在床荷的情况下，沉积物颗粒的运动具有统计特性。因此，我们可以从碰撞时的振幅统计数据确定沉积物颗粒数量的传递作用。结果表明：(1)振幅的统计特性强烈依赖于沉积物的直径。(2)了解床附近的流速或剪切速度很重要。为了获得床附近的速度，将平面二维电磁速度计安装在刚性床（例如固结坝的顶部）上。有用(3)了解应用估计方法的限制也很重要。极限可以用无量纲剪应力来评估，其标准取决于河床梯度。根据上述讨论，我们建立了包括河床形态在内的泥沙颗粒运动和排斥的数值模拟模型，并讨论了确定传递矩阵的方法从声音信号（振幅）到沉积物排放。我们还讨论了观测流域内降雨和沉积物径流过程的综合系统。