水科学进展2011，Vol.22Issue(6)：807-812,6.DOI:32.1309.P.20111125.1636.014
三峡水库下游宜昌—昌门溪河段河床调整分析
Riverbed evolution in the Yichang-Changmenxi reach downstream of Three Gorges Reservoir
摘要
Abstract
An index K, which stands for the extent of riverbed evolution, is proposed and used to analyze the riverbed evolution in the reach of Yichang to Changmenxi. The study finds that K is inconsistent with the net scour intensity , while positively correlated to the ratio of width to depth and negatively correlated to the median diameter of bed material when the diameter is less than 0. 5mm. Preliminary analysis shows that; it is easy to reach the state of transport saturation for coarse sediments downstream of the Three Gorges Reservoir. And the coarse sediments deposit when transport capacity decreases, causing great local deposition on wide-shallow river channels and the net scour intensity decreases, and riverbed evolution strengthens. When the median diameter is less than 0. 5mm, the suspend loads is dominant in the downstream scouring amount, resulting that; the finer the bed material is, the greater the scouring a-mount and the riverbed evolution is. Considering the changes of capacity of sediment transport along the river reach after dam construction, two ways of coarsening the river bed are discussed.关键词
三峡水库/河床调整/河床粗化/挟沙力Key words
Three Gorges Reservoir/ riverbed evolution/ coarsening/ sediment carrying capacity分类
建筑与水利引用本文复制引用
罗优,陈立,许文盛,苏畅..三峡水库下游宜昌—昌门溪河段河床调整分析[J].水科学进展,2011,22(6):807-812,6.基金项目
国家自然科学基金资助项目(10932012) （10932012）
中央高校基本科研业务经费专项资金资助(20082060101000026) （20082060101000026）
