| 摘要: |
| 为了建立涵盖更多物理机制的河口潮平均盐度解析模型，更好地探究风对盐度纵向分布的影响，本文在MacCready河口潮平均准稳态盐度模型基础上进行了以下改进：在风作用的基础上，通过加入经过盐度分层作用修正的垂向紊动黏性系数垂向结构进行盐度分布的解析。以现有的改进模型计算不同风速风向下Delaware河口的盐水上溯距离、Ri值、紊流边界层厚度和断面盐通量分布的结果可以发现：对于离岸风，当风速增强，上溯距离、Ri值和断面盐通量都是先增大后减小，边界层厚度不断增加；对于向岸风，当风速增强，上溯距离、Ri值和断面盐通量都是不断减小，边界层厚度不断增加。风对河口垂向平均盐度纵向分布的影响主要体现在张力效应和垂向紊动混合两个方面改变离散盐通量大小，从而直接影响盐度纵向分布。 |
| 关键词: 河口 盐度解析模型 风速风向 垂向紊动黏性系数 |
| DOI：10.11693/hyhz20171000252 |
| 分类号:P731 |
| 基金项目:国家重点研发计划项目，2016YFC0401505号；江苏省海岸海洋资源开发重点实验室开放基金项目，JSCE201510号。 |
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| THE ANALYTICAL MODEL OF ESTUARINE TIDALLY AVERAGED QUASI-STEADY SALINITY |
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ZHU Yu-Liang1, CHEN Wei-Lun1, CHU Ao1,2
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1.College of Harbor, Coastal and Offshore Engineering, Hohai University, Nanjing 210098, China;2.Jiangsu Key Laboratory of Coast Ocean Resources Development and Environment Security, Nanjing 210098, China
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| Abstract: |
| The model of MacCready tidally averaged quasi-steady estuary salinity was improved considering the effect of wind at different speed and the vertical distribution of vertical turbulent viscosity coefficient against salinity stratification. For offshore case, when wind speed increases, taking Delaware estuary (USA) as an example, when saltwater upstream distance and the Ri (the Richardson number) increase first and then decrease, the boundary layer thickness increases. For onshore wind case, when wind speed increases, when upstream distance and the Ri value decrease, the boundary layer thickness increases. The influence of wind on vertical distribution of vertical average salinity of estuary is indicated mainly in two aspects, i.e., the straining effect and vertical turbulent mixing, which change the magnitude of dispersion salt flux and directly affect the vertical distribution of salinity. |
| Key words: estuary salinity analytical model wind speed and direction vertical turbulent viscosity coefficient |
