舟山群岛海域波浪对泥沙冲淤过程的影响  

Effect of Sea Waves on Sediment Transport in the Sea Waters Surrounding Zhoushan Islands, China

作　　者：陆罕芳 顾峰峰 陈学恩 戚定满 LU Han-Fang;GU Feng-Feng;CHEN Xue-En;QI Ding-Man(College of Oceanic and Atmospheric Sciences,Ocean University of China,Qingdao 266100,China;Shanghai Estuary and Coastal Science Research Center,Shanghai 201201,China)

机构地区：[1]中国海洋大学海洋与大气学院,山东青岛266100 [2]上海河口海岸科学研究中心,上海201201

出　　处：《中国海洋大学学报（自然科学版）》2019年第8期1-9,共9页Periodical of Ocean University of China

基　　金：国家重点研究发展计划项目“海洋环境安全保障”重点专项课题“海洋仪器设备规范化海上试验”(2016YFC1401300);海洋公益性行业科研专项课题“海洋站生态环境长期综合观测系统集成技术研究与示范项目(201505007)资助~~

摘　　要：本文基于SWEM(Shallow Water Equation Model)三维水沙盐模式,考虑潮汐、径流、风场和波浪影响,在长江口与杭州湾及其邻近海域建立了一个高分辨的三维水沙盐模型。分析了一般天气条件下,舟山群岛海域在潮汐、径流、风场、波浪共同作用下的地形冲淤与悬沙含量分布特征,并对比分析了一般天气条件下与台风天气条件下波浪对泥沙冲淤过程的影响。一般天气条件下,舟山群岛海域东西向水道为冲刷特征,舟山群岛东侧海域以及舟山群岛内部南北向水道为淤积特征。舟山群岛海域暖半年冲刷增强,冷半年淤积增强。海域悬沙含量由西北向东南迅速降低,群岛“虑沙”效果明显。悬沙含量3月份最大,8月份最小。波浪对舟山群岛海域泥沙冲淤过程的总体影响在秋冬季较强,春夏季较弱。一般天气条件下与台风天气条件下,波浪对研究海域泥沙冲淤过程影响显著的区域均为朱家尖东侧海域,且波浪的影响特征均表现为促进淤积和增加悬沙含量。一般天气条件下波浪引起最大淤积约占总淤积量的10%。台风天气条件下波浪引起的淤积量约是同时段一般天气条件下的6倍。Based on the Shallow Water Equation Model(SWEM),a high-resolution three-dimensional tidaland sediment model was builtin the Yangtze Estuary,Hangzhou Bay and its adjacent waters,with the tide,runoff,wind and waves effects,to analyze the microtopography change and sediment suspendconcentration(SSC)distribution under the general weather condition and the typhoon weather condition.Under the general weather condition,the east-west waterways in Zhoushan Islandsarea are characterized by erosion,and the east areaof Zhoushan Islands and the north-south waterways in Zhoushan Islands area are characterized by deposition.During the spring and summer,the erosion enhanced and during the fall and winter,the siltation enhanced.The SSC rapidly decreases from northwest to southeast,showing the islands effect as a filter for the sediment transportation.The SSC reaches the maxima valuein March,and the minima valuein August.The wavesinfluence on sediment transportin Zhoushan Islands areain fall and winter is stronger than that of in spring and summer.Both under the general weather condition and the typhoon weather condition,the area effected by waves significantly in Zhoushan Islands area is the east area of Zhujiajian island,as waves promoting sedimentation and increasing SSC.Under the general weather condition,maxima value of deposition induced by waves accounted for 10%of the total deposition.Under the typhoon weather condition,the deposition induced by waves is 6 time than that of under the general weather condition.

关 键 词：舟山群岛海域 泥沙冲淤 SWEM 波浪作用 

分 类 号：P717[天文地球—海洋科学]