三峡水库下游近坝沙卵石河段演变规律研究  

Study on evolution process of lower gravel bed reach near Three Georges Reservoir

作　　者：黄颖 

机构地区：[1]长江航道局,湖北武汉430010

出　　处：《人民长江》2013年第4期13-17,共5页Yangtze River

基　　金：国家科技支撑计划课题(2011BAB09B01;2012BAB05B02)

摘　　要：经过比较三峡水库蓄水后宜昌至大布街河段河床演变预测成果与实际观测数据之间的差异,分析了形成这种差异的原因。结果显示:陈二口以上的河床冲刷,是导致宜昌枯水位下降的主要原因;大布街以下沙质河床的冲刷,虽对陈二口以上河段枯水位影响较小,但却是造成芦家河水道枯期坡陡流急现象的主要原因。以往研究成果与三峡蓄水后实测数据存在差异的主要原因是,预测研究中对芦家河水道河床组成的模拟准确性不够、忽略了沿程冲刷不均匀分布的特性等。The differences between prediction results and practical phenomena of riverbed evolution at Yichang - Dabujie reach after impoundment of Three Gorges Reservoir are compared, and the causes for the differences are analyzed. It is found that the drop of low water level at Yichang station is mainly induced by channel erosion at the upper reach of Chen^rkou. The impact of sandy riverbed erosion below Dabujie on low water level of upper reach of Chen^rkou is relatively smaller, however it is the main cause of rapid flow and steep slope at Lujiahe waterway. The causes for the differences between prediction results and measured data are the insufficient information of bed material composition and ignorance of uneven erosion depth along channel bed.

关 键 词：近坝河段 卵石河段 河床演变 三峡工程 

分 类 号：TV14[水利工程—水力学及河流动力学]