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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.

本研究的目的是发展一种利用水听器来检测泥沙颗粒对水听器的影响的泥沙流量估计方法。根据农民的研究，已知由于碰撞引起的声音的幅度将与运动泥沙的动量成比例。因此，我们可以确定的迁移作用，从统计的振幅在碰撞的沉积物颗粒的数量。结果表明：（1）振幅的统计特性强烈依赖于泥沙粒径。(2)It了解床附近的流速或剪切速度很重要。为了获得近床面的流速，将平面二维电磁流速计安装在刚性床面（如固结坝顶部）上。（3）知道应用估计方法的极限也很重要。在此基础上，建立了考虑河床形态的泥沙颗粒运动和推斥的数值模拟模型，并讨论了声信号（振幅）到输沙量的传递矩阵的确定方法。并对集水区降雨产沙径流过程观测系统进行了探讨。