浙江象山港海域悬沙浓度分布变化及其水动力影响分析  

Distribution changes of suspended sediment concentration and its dynamic analysis in Xiangshan Bay,Zhejiang Province

作　　者：周鸿权[1,2] 孙昭晨[1] 李伯根[2] 武小勇[2] 巩明[2] 杨辉[2] 

机构地区：[1]大连理工大学海岸与近海工程国家重点实验室,辽宁大连116024 [2]国家海洋局第二海洋研究所国家海洋局工程海洋学重点实验室,浙江杭州310012

出　　处：《海洋通报》2014年第6期694-702,共9页Marine Science Bulletin

基　　金：海洋公益性行业科研专项(201105009);国家海洋局青年基金(2012327);国家海洋局第二海洋研究所基本科研业务费专项(JT1203)

摘　　要：利用冬、夏两季象山港15个同步连续站和60个准同步大面站实测悬沙浓度数据,结合实测潮流、盐度等海洋水文资料,分析了象山港海域悬沙浓度变化规律。结果表明,象山港海域悬沙浓度分布具有较明显冬季大于夏季、大潮期大于小潮期以及湾口向湾顶逐渐减小的变化特征。这些特征主要受制于冬季高含沙量、低温、低盐的闽浙沿岸流与夏季高温、高盐、低含沙量的台湾暖流的交替作用和半月潮周期潮流动力变化的影响。在这种背景下,由于潮流动力作用,大小潮周期中底部沉积物与水体悬浮泥沙之间存在再悬浮与沉降的交换过程。Based on the data of suspended sediment concentration from 15 continuous stations and 60 quasi-synchronous grid stations in winter and summer of 2011, combined with the hydrodynamic data of tide, salinity and so on, this paper analyses the characteristics of suspended sediment concentration distribution in Xiangshan Bay. It shows that the suspended sediment concentration in winter is significantly higher than that in summer, and the magnitude is greater during spring tide than that during neap tide in the same season. Spatially, the suspended sediment concentration decreases constantly from mouth to top of the bay. Furthermore, it is concluded that the distribution of suspended sediment is mainly influenced by the alternative effect of coastal current in Fujian and Zhejiang with high suspended sediment concentration, low temperature, low salinity in winter and Taiwan warm current with high temperature, high salinity, low suspended sediment concentration in summer, and by the tidal dynamic changes in semimonthly tidal cycle. Under this condition, due to the tidal force, there is an exchange process of re-suspension and settlement between the bed sediment and suspended sediment in semimonthly tidal cycle.

关 键 词：象山港 悬沙浓度 季节变化 潮周期变化 再悬浮 

分 类 号：TP79[自动化与计算机技术—检测技术与自动化装置]