水科学进展2018，Vol.29Issue(2)：186-195,10.DOI:10.14042/j.cnki.32.1309.2018.02.005
三峡水库下游分汊河道滩槽调整及其对水文过程的响应
Responses of riverbed morphology to the hydrological regime in anabranching reaches of the downstream Three Gorges Reservoir
摘要
Abstract
To explore the evolvement characteristics and driving mechanism of a anabranching river channel under the influence of a water control project,this study classifies the branching river channel on the basis of the dynamic split ratio and measured hydrology and topography data for the lower reach of the Three Gorges Reservoir.The regulation rules of the primary branching river channel,secondary branching river channel,and low river island and their effects on the hydrological process are also investigated.The results reveal the following points.First,when the Three Gorges Reservoir is impounding,the low river island of the anabranching river channel shrinks.The branching river channel shows the specific rule of coexistence of "primary branching river channel goes up and secondary branching river channel goes down" and "primary branching river channel goes down and secondary branching river channel goes up." Second,on the basis of the dynamic split ratio of the classification of the branching river channel,these evolutionary differences are summarized as follows:the development rate of the dry-water-prone branching river channel is greater than that of the flood-prone branching river channel,and the flood-prone branching river channel has basically been characterized by siltation since 2008.Third,the decrease in flood and the continuous increase in the medium flow are the driving factors for the adjustment of channel.The erosion and sedimentation of the branching river channel show a stable pattern of the primary and secondary branching river channels,which is compatible with the hydrological process of decreasing the coefficient of runoff variation.关键词
分汊河道/滩槽调整/水文过程/三峡水库/长江中游Key words
anabranching river/riverbed process/hydrological regimes/Three Gorges Reservoir/middle Yangtze River分类
建筑与水利引用本文复制引用
韩剑桥,张为,袁晶,赵瑾琼..三峡水库下游分汊河道滩槽调整及其对水文过程的响应[J].水科学进展,2018,29(2):186-195,10.基金项目
国家自然科学基金资助项目(51779184) （51779184）
陕西省自然科学基础研究计划资助项目(2017JQ4011)The study is financially supported by the National Natural Science Foundation of China (No.51779184). （2017JQ4011）
