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Study on field measurement of sand waves in a natural river

天然河流沙波现场测量研究

基本信息

批准号：
06555149
负责人：
MICHIUE Masanori
金额：
$ 0.7万
依托单位：
Tottori University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (A)
财政年份：
1994
资助国家：
日本
起止时间：
1994 至 1996
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-06555149/
关键词：
naturak river sand waves Local Scour field measurement flood remote control boat 実河川洪水観測

项目摘要

There have been few field measurement of sand waves in a natural river during flood, due to lack of the measuring instrument. Therefore, the purpose of this study is to develop a filed measuring system for sand waves in natural rivers without man's operation. In this system, remote control boat with echo-sounder and total station which measures the position of boat are used. In order to develop this system, it is necessary to accumulate the measurements and verify their accuracy.During the first year, we had developed the remote control boat and taken the filed measurement in Sendai River during low water discharge. It is found that the bed level in a natural river can be measured with sufficient accuracy in this system during low velocity.In the following year, we have modified the remote control boat in order to conduct the measuring during high velocity such as flood and evaluated the accuracy of the measurement over the above period. Several problems in monitoring which occurred in this system during bad wether condition were investigated.This year as the last year of investigation, the influence of bed conditions such as sand diameter and bed slope, and noise reduction method from actual measurement have been studied. Finally, a total field meauring system was completed. However, we regret that we were not able to obtain the measurement during flood. Because there were no major flood this year so that we could not cover up all cases for application of measuring system.

由于测量仪器的缺乏，对天然河流汛期沙波的现场测量很少。因此，本研究的目的是开发一种无需人工操作的天然河流沙波现场测量系统。该系统采用遥控船、测深仪和全站仪来测量船的位置。为了开发该系统，有必要积累测量数据并验证其准确性。在第一年，我们研制了遥控船，并在仙台河低潮时进行了实地测量。结果表明，该系统在低速条件下能较好地测量天然河流的河床平面。在接下来的一年里，我们改进了遥控船，以便在洪水等高速期间进行测量，并评估了上述期间测量的准确性。对该系统在恶劣天气条件下监测中出现的几个问题进行了探讨。今年作为调查的最后一年，研究了沙粒直径、河床坡度等河床条件的影响，并从实际测量中研究了降噪方法。最后，完成了一个完整的现场测量系统。但是，很遗憾，我们无法在洪水期间获得测量结果。因为今年没有发生大的洪水，所以我们不能掩盖所有的情况来应用测量系统。