水利学报2018，Vol.49Issue(1)：72-80,9.DOI:10.13243/j.cnki.slxb.20170634
珠江河口口门区滩槽演变及对泄洪的影响研究
The impact of channel-floodplain evolution on the flood release in the mouths of Pearl River Estuary
摘要
Abstract
Regional security of flood control is highly related to the clearness of estuarine mouth.Due to the impact of variable flow and sediment load and intensive human activities,the rule of channel-floodplain evolution is complicated in the Pearl River Estuary.Hence,regional security of flood control should be further explored.This paper characterizes the evolution of channel-floodplain in the Pearl River Estuary and reveals the hydrodynamic mechanism of river mouth bar evolution.Besides,the influence of multiple large-scale wading projects on flood release is evaluated.The classification of estuarine sensitive region under the control of runoff and tide is presented and the influential factor of flood control is quantified.It is found that:(1) with significantly decreasing sediment load,the floodplain has the potential of erosion,which may provide advantage for flood release;(2) alongshore current driven by monsoon and flood flow are the main influential factors of east and west channel evolution of river mouth bar,and the interaction of flood and wave leads to the erosion of inner and outer slope and siltation of crest for river mouth bar;(3) wading projects exert group effect on the water level,flow division ratio,the load of flood release and tidal prism,and the variation of water level is more sensitive to bridge constructions than reclamation projects in the four eastern mouths while it is reverse in the four western mouths;(4) according to the ratio of runoff and tide,unit discharge and the effect of water block,regional classification is proposed to distinguish the flood risk of different channels;(5) the height of water block in the sensitive part of channel is calculated.Base on the transverse hydraulic geometry,the decrease of tidal prism caused by wading projects should be less than 1％-2％.关键词
滩槽演变/拦门沙演变/工程群累积影响/防洪潮敏感区/控制指标Key words
channel-floodplain evolution/river mouth bar evolution/engineering group effect/sensitive region with flood risk/controlling indexes分类
建筑与水利引用本文复制引用
何用,卢陈,杨留柱,叶荣辉,邹华志,王华..珠江河口口门区滩槽演变及对泄洪的影响研究[J].水利学报,2018,49(1):72-80,9.基金项目
国家自然科学基金项目(51779280) （51779280）
公益性行业科研专项经费项目(201301073) （201301073）
