採沙坑運移之實驗研究

Abstract

本研究目的藉由一系列實驗探討採砂坑之沖淤行為，這些結果將被提供於採砂之機制中作為參考。本試驗利用因次分析得到之經驗式，以不同之邊界條件、流量模擬之。由實驗數據獲得各階段坑深、坑速之經驗公式。除此之外，不受回水影響之情況下，改變下游邊界條件將不影響採沙坑之運移，實驗將於採沙坑消失結束而停止。

The purpose of this study is to investigate the scouring and deposition behavior of the sand mining pits through a series of experiments. These results will then provide useful information for the channel mining operations. Dimensional analysis was performed and experiments were conducted accordingly. Several different boundary conditions, water discharges were used in the experiments. Based on the experimental results, empirical formulas for pit height and pit velocity were obtained. Besides these, the change of down boundary conditions in the experiments will not significantly influence the migration of the mining pit. The experiments were terminated till the filling up of the pits are reached.