懸浮載源傳輸機制之探討

Abstract

本研究乃擬採用謝氏(1992),謝氏(1994),連氏(1996)等所發展之二維非均勻質輸砂模式模 擬探討懸浮載源之傳輸機制 本研究著重於懸浮載源傳輸機制之探討,以了解懸浮載源與懸浮載濃度,顆粒大小,粒徑百分 比組成彼此間之關係與河床沖淤變動之情形,結果顯示懸浮載源確能擔任河床載與懸浮載兩 者間之橋樑 另由於模式中採用Van Rijn(1984b)之經驗公式計算河床載,故宜注意模式顆粒 大小在公式應用之範圍內(0.04mm~40.0mm) This study simulates the transport mechanism of the suspended-load source using the two dimensional nonuniform sediment transport model developed by Hs ieh(1992),Hsieh(1994),and Lien(1996)etc. This study focuses on the transpor t mechanism of the suspended-load source,in order to realize the relation amon g the suspended-load source, the concen-tration of suspended load , particle s ize, size fraction, and the evolution ofthe bed form.The simulated results sho w the reasonable exchange rate between thebed load transport and suspended loa d transport by the way of suspended-load sources.The empirical formula conduct ed by Van Rijn (1984b) is employed in this model to calculate the bed load tra nsport. It must be considered that the particle size is within the range from 0.04mm to 40.0mm.