长江口枯季水动力悬沙特征与再悬浮研究  

Hydrodynamics and Fine-grained Sediment Resuspension in Changjiang Estuary during Dry Seasons

作　　者：杨旸[1] 汪亚平[1] 高建华[1] 贾建军[2] 王爱军[3] 

机构地区：[1]南京大学海岸与海岛开发教育部重点实验室,南京210093 [2]国家海洋局第二海洋研究所,杭州310012 [3]国家海洋局第三海洋研究所,厦门361005

出　　处：《南京大学学报（自然科学版）》2006年第6期643-655,共13页Journal of Nanjing University（Natural Science）

基　　金：国家重点基础研究发展规划项目(2002CB412401);国家自然科学基金(40106009)

摘　　要：2004年2月13～22日枯季大小潮期间在长江口北港、口门及口外进行了水动力、悬沙浓度和盐度的全潮观测，并列数据进行分析，同时对研究区域的再悬浮／沉降通量进行计算。进向讨论长江口枯季水动力和再悬浮特征．结果表明，长江口外以潮流作用为主，但流速、悬沙浓度和盐度的分布和变化仍与径流作用有关，观测期间再悬浮现象不显著，北港内及口门处，径流作用较强，盐度较低，落潮流速大于涨潮流速，当流速较大时，底部再悬浮作用显著．计算结果表明，再悬浮通量的数量级为10^-3～10^-6kgm^-2s^-1，沉降通量为10^-9～10^10kgm^-2s^-1．Hydrodynamic parameters, suspended sediment concentrations （SSC） and salinity have been measured at Changjiang Estuary during spring and neap tidal cycles in the dry season, i.e. February 13-22, 2004. The resuspended sediment fluxes are also calculated. The results show that out of Changjiang Estuary, the resuspension is not significant, where the current velocity, SSC and salinity are dominated by tide currents. In the Beigang Channel of Changjiang Estuary, the salinity is very low due to fresh water of river discharge from Changjiang, where the current velocities are stronger in neap than those during spring. Furthermore, the bottom resuspension occurs associated with the observed strong currents. The magnitude of sediment resuspension flux is 10^-3- 10^-6 kg m ^-2s^-1 ,and settling flux is 10^-9-10^10kg m^-2s^-1.

关 键 词：潮流 悬沙浓度 再悬浮 长江口 

分 类 号：P737.12[天文地球—海洋地质]