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钦州湾近期河床演变特点及成因

Study on recent evolution in the Qinzhou Bay
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摘要 为认识钦州湾河床演变特点及其冲淤成因,采用历年实测水下地形及海图资料,建立DEM模型,从平面和断面形态调整、河床冲淤等方面分析了钦州湾河床演变特点,结果表明:2005-2015年间,钦州湾卡口段及其上游茅尾海滩地总体呈淤积发育,河道出口主槽水域略呈冲刷下切,湾外区域滩面冲刷,原四滩三槽滩槽形态改变,西槽顶部明显淤浅,中槽消退,东槽地位凸显。从上游来沙及各类人类活动等方面进行的归因分析表明,人类活动尤其是水域围填和航道建设导致钦州湾水沙动力环境变化,对本阶段钦州湾的河床演变起着主要作用。 Based on historic underwater topography and nautical chart data,the Digital Elevation Model for the evolution of the reach is established,to analyze characters and reasons of the recent fluvial processes in the Qinzhou Bay from adjustment of planform,cross-section and river bed. Results indicate that during 2005-2015,the middle of the Qinzhou Bay and shoals of the Maowei sea were general charactered by siltation,the main channel at the outlet of the river was slightly washed down and cut off,and beach surface outside the bay showed erosion,the beach groove shape by four shoals and three channels changed,the top of the west channel was obviously shallow,the middle channel disapeared and the position of east slot is becoming more and more prominent. In addition,upstream sediment conditions and human activities were analyzed to clarify the mechanism of evolution. Results show that human activities,especially reclamation and channel construction,lead to changes in the dynamic environment of water and sediment in the Qinzhou Bay and play a major role in the riverbed evolution on the Qinzhou Bay at this stage.
作者 杨莉玲 徐峰俊 余顺超 YANG Li-ling;XU Feng-jun;YU Shun-chao(Key Laboratory of the Pearl River Estuarine Dynamics and Associated Process Regulation,Ministry of Water Resources,Guangzhou 510611,China;The Pearl River Hydraulic Research Institute,Guangzhou 510611,China)
出处 《泥沙研究》 CSCD 北大核心 2020年第4期39-44,共6页 Journal of Sediment Research
基金 国家自然科学基金项目(51779280) 广西水利厅科技项目(201505,201602)。
关键词 河床演变 冲淤成因 人类活动 钦州湾 fluvial processes mechanism of scour and deposition human activity Qinzhou Bay
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