混合粒徑輸砂量估算之研究

Abstract

摘 要 本研究以混合粒徑進行輸砂量試驗並觀察試驗過程中泥砂運移現象，發現混合粒徑渠床對於不同水流作用會產生不同程度之分選或遮蔽效應。 將本研究之渠槽試驗數據配合國內外渠槽資料重新迴歸分析討論，推得一考慮單寬流量、坡度及粒徑分佈因子之臨界流量與沉滓運移模式。 經與前人輸砂量模式進行驗證比較，可知本研究所推導出之輸砂量模式，無論在均勻或混合粒徑試驗資料上，較其他各家輸砂模式更吻合試驗數據，因此，利用本研究所推導之輸砂模式對均勻或混合粒徑均可以普遍提供良好之推估結果。 關鍵字：混合粒徑、渠槽試驗、輸砂量

ABSTRACT This study used mixed-grain as the materials to do sediment transport flume experiment and observed the motion of sediment in the process of the experiment. We could find that mixed-grain in the channel-bed was occurred different sorting or hiding phenomenon in the different flow discharges. According to the experimental data of this study and other existing flume data collected from home and abroad, we derived the models for critical discharge and sediment transport conducting unit effective flow discharge, slope and gradation coefficient by multiple regression analysis. After verification and comparison, the model of this study matched better with the experiment data of both uniform and mixed grain than those of existing sediment transport models. Therefore, using the sediment transport model derived in this study could provide the reasonable result for estimating uniform or mixed grain sediment transport accurately. Keywords：Mixed Grain Size, Flume Experiment, Sediment Discharge