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.

这项研究的目的是根据农民研究来开发一种使用水音的估计方法排放的估计方法，以检测沉积物颗粒对水文的影响，众所周知，碰撞引起的声音振幅与床负载的动量成比例，如果床负荷的动量，沉积物颗粒的运动具有统计特性。因此，我们可以确定从碰撞幅度的统计数据转移到沉积物颗粒的数量。结果，指出了以下内容。（1）振幅的统计特性在很大程度上取决于沉积物的直径。（2）了解床或剪切速度附近的流动速度很重要。为了使速度在床附近，一个扁平的面向二维电磁速度计，该速度仪连接在刚性床上，例如合并大坝的顶部。很有用（3）知道应用估计方法的限制也很重要。可以评估极限的非二维剪切应力，标准取决于床梯度。根据上述讨论，我们开发了一种包括河床构型在内的沉积物颗粒运动和排斥的数值模拟模型，并讨论了确定从声学信号（振幅）到沉积物的转移矩阵的方法。我们还讨论了综合系统，以观察集水区降雨和沉积物的径流过程。