加大流量对簸箕李引黄灌区泥沙输移影响分析

Analysis on the influence of increased flow on sediment transportation in Bojili Yellow River Irrigation Area

本文以簸箕李引黄灌区为研究对象,针对引用黄河水带来的泥沙影响,结合灌区引水、引沙情况,分析研究泥沙输移规律,提出加大引水流量、减少泥沙淤积的水沙调度方案,即增流减淤。经过实践运行,条渠内泥沙淤积量明显减少,出口含沙量增大,条渠上游4km淤积极少,条渠内淤积物主要为粗沙,大部分较细泥沙以悬浮的形式输送到下游,达到了远距离输沙、分散处理的目的。

Bojili Yellow River Irrigation Area is adopted as the object of study in the paper.Aiming at sediment influence caused by the use of water in the Yellow River,the condition of water diversion and sediment diversion in irrigation area is combined to analyze and study the sediment movement law and propose to increase the diversion flow and reduce sediment siltation as water and sand scheduling programs,i.e.flow increase and sediment deposition decrease.Operation practice shows that the sediment deposition is significantly reduced in the strip channel,the sediment concentration is increased at the outlet,and silt is little at 4km upstream area of the channel.The siltation is mainly coarse sand,and most of the fine sediment is transported downstream in the form of suspension in the channel,thereby achieving the purpose of long-distance sediment transport and dispersion treatment.