水库下游近坝段卵石推移质输沙率的研究  

Study on gravel bed-load transport rate in downstream reach below the dam

作　　者：何娟[1] 陈立[1] 鲍倩[1] 孙亮[1] 

机构地区：[1]武汉大学水资源与水电工程科学国家重点实验室,湖北武汉430072

出　　处：《泥沙研究》2008年第4期69-73,共5页Journal of Sediment Research

摘　　要：水库下游近坝河段推移质输沙问题十分复杂,涉及到多方面因素的影响。本文分析了水库下游近坝河段卵石推移质的产输规律,引入临界起动粒径的概念,建立适用于近坝河段的起动流速公式。选择适用于近坝河段的成勘院经验公式并对参数加以率定,结合近坝河段起动流速公式建立近坝河段的卵石推移质输沙率公式,经检验结果基本吻合。The problems of gravel bed-load transport in downstrean reach below the dam are very complicated. In this paper, the characteristics of the gravel bed-load transport is analyzed. The incipient velocity formula is founded by introducing the concept of critical incipient grain. By comparing different formulas for gravel bed-load transport rate, the empirical formula by Chengdu is selected and its parameters are calibrated with the field data. Combined with the incipient velocity formula, a formula for gravel bed-load transport rate in downstream reach below the dam is founded and verified to be reasonable.

关 键 词：近坝河段 卵石推移质 起动流速 输沙率 

分 类 号：TV142[水利工程—水力学及河流动力学]