摘要
珠江河口磨刀门口外拦门沙的形成,受径流、潮流、沿岸流、波浪影响,且河口的地形条件及泥沙运动也是拦门沙的重要影响因素。根据近40 a来实测地形资料,对磨刀门口外中心拦门沙、西侧拦门沙、东西两汊深槽的演变进行了分析,并对拦门沙区域的冲淤变化进行了讨论。分析结果表明:珠江河口磨刀门口外拦门沙区东、西汊不断向海延伸、拓宽,大洪水对东、西汊的发育起到显著促进作用;东汊走向则有一定摆动,东汊发育具有显著的季节性特征,受波浪改造作用明显;中心拦门沙内外坡以冲刷为主,滩顶淤积加高,南北径缩短;西侧交杯沙在波浪作用下呈新月形发育,交杯四沙向陆并岸的过程中,易受到洪水冲决作用,在并岸的浅滩中冲出深槽。研究结果可为河口规划、整治提供参考。
The formation of mouth sand bar outside Modaomen Estuary of the Pearl River is subject to the influences of stream flow,tidal current,offshore current and wave. Besides,morphological condition and sediment transport are also key factors affecting the evolution of mouth sand bar. According to measured topographic data in the last four decades,this study is devoted to analyze the evolution of the central and western parts of mouth sand bar and its tidal channels. The morphological evolution in the mouth sand bar area is also investigated. Results indicated that1） promoted by big flood events,the tidal channels on both sides of mouth sand bar extended and broadened stepwisely; 2） the eastern channel presented a certain swing trend,which was affected by explicit seasonal characteristic and wave effect; 3） the inner and outer slopes of central mouth sand bar were eroded,while the crest was deposited and heightened,with the north-south diameter shortened; 4） the Jiaobei sand bar on the west side was crescent-shaped due to the wave effect,and was prone to be scoured with channel down cutting by flood. The research result provides reference for the planning and rectification of the estuary.
作者
吴门伍
严黎
杨留柱
卢陈
杨裕桂
WU Men-wu;YAN Li;YANG Liu-zhu;LU Chen;YANG Yu-gui(Key Laboratocy of the Pearl River Estuarine Dynamics and Associated Process Regulation under Ministcy Water Resources, Pearl River Hydraulic Research Institute, Pearl River Water Resources Commission, Guangzhou 510610, China)
出处
《长江科学院院报》
CSCD
北大核心
2018年第6期141-145,153,共6页
Journal of Changjiang River Scientific Research Institute
基金
长江科学院开放研究基金项目(CKWV2017499/KY)
水利部公益性行业科研专项项目(201501010)
珠江水利科学研究院开放研究基金项目([2013]KJ05)
关键词
拦门沙
河床演变
珠江
磨刀门
东西两汊
mouth sand bar
riverbed evolution
Pearl River
Modaomen
east and west branches
