莱州湾东部海岸剖面冲淤演变研究  

Study on profile evolution in the Eastern Coast of Laizhou Bay

作　　者：王丽雪 李雪艳[1] 王庆[1] 战超[1] 郭为军[2] 张俊斌 李钦 张之晨 WANG Lixue;LI Xueyan;WANG Qing;ZHAN Chao;GUO Weijun;ZHANG Junbin;LI Qin;ZHANG Zhichen(Coast Institute,Ludong University,Yantai 264025;College of Environmental Sciences and Engineering,Dalian Maritime University,Dalian 116026,China)

机构地区：[1]鲁东大学海岸研究所,山东烟台264025 [2]大连海事大学环境科学与工程学院,辽宁大连116026

出　　处：《海洋湖沼通报》2020年第6期44-52,共9页Transactions of Oceanology and Limnology

基　　金：国家自然科学基金项目(51709140,51879019,51609029,41471005);NSFC-山东联合基金项目(U1706220);国家重点研发课题(2017YFC0505902);水沙科学与水灾害防治湖南省重点实验室开放基金项目(2016SS02);海岸灾害及防护教育部重点实验室开放研究基金项目(201703);辽宁省自然科学基金(20170540096)。

摘　　要：在莱州湾东部海岸侵蚀日益加剧的背景下,本文利用海图、地形图、地质钻孔柱状图和海洋水文观测记录等资料,基于二维浅水方程、波作用守恒方程和对流扩散方程构建了波浪-潮流-泥沙耦合数值模型,分析了河流入海泥沙减少背景下莱州湾东部屺坶岛至刁龙嘴岸段的海岸剖面冲淤演变。研究结果表明,河流入海泥沙减少对屺坶岛至刁龙嘴岸段的剖面冲淤演变影响显著。所选取不同河口与沙嘴附近剖面的冲淤演变趋势差异显著,且同一剖面不同部位的冲淤演变特征各异。随着河流入海泥沙的减少,河口区域淤积程度明显减弱甚至发生侵蚀,其它区域冲淤动态平衡状态被打破并逐渐向强侵蚀发展,侵蚀深度和范围显著增大。Based on the background of increasing erosion along the eastern coast of Laizhou Bay, using sea charts, topographic maps, geological drill columnar section and oceanic observational data, this paper established a numerical model, which couples wave, tidal current and sediment, to study dynamic change and the evolution of profile scouring and silting in the context of the sediment decrease caused by the reservoir’s impact on the fluvial sediment transportalong the coast from Qimu island to Diaolongzui spit located in the eastern coast of Laizhou Bay. The modelis based ontwo-dimensional shallow water equation, wave action conservation equation and the convection diffusion equation. The numerical results showed thatthe evolution of the section scouring and silting changed significantly because of the decrease of river sediment load into the sea. The evolutional trend is very different among the profiles located near the river mouths and spits and their features are also various in different regions. With the decrease of river sediment load into the sea, from the profile evolution,the sedimentation degree near the river mouth is obviously weakened or even eroded, and the dynamic equilibrium state of scour and deposition in the other regionsis broken and gradually develops to strong erosion. Meanwhile, the erosion extent and range are increased significantly.

关 键 词：入海泥沙减少 剖面冲淤演变 砂质海岸 莱州湾东岸 

分 类 号：P731[天文地球—海洋科学]