3D numerical modeling of wind-driven flow in the high salinity Aibi Lake
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摘要: 根据高盐度湖泊水动力特征,以西北咸水湖泊艾比湖为例,建立三维水动力数学模型。选取典型风场,分析风力作用下的高盐度湖泊风生流形成过程以及风生流水动力参数的三维空间分布特征。结果表明,艾比湖风生流形成在时间上可分为湖水流向和风向一致阶段、湖水运动方向逐渐偏离风向的过渡阶段及环流形成的稳定阶段等3个阶段。当流场达到稳定状态时,表层水体除中部存在若干小尺度环流外,大部分水域流向与风向基本一致;而湖泊中心区域底层水体流向与表层水体的流向大致相反,表现为很明显的补偿流。总体上,水平方向的流速自表层向下呈现递减的变化趋势,岸边流速大于中心流速,表现出与淡水湖泊基本相似的水动力空间分布特征。水体盐度增加对湖泊环流结构无影响。Abstract: According to the hydrodynamic characteristics of high salinity lake,a three-dimensional (3D)hydrodynamic numerical model is designed to simulate the dynamic in Aibi Lake which is a high salinity lake in northwest China.Selecting typical wind fields,we apply this model to simulate the formation process of wind driven flow and 3D spatial distribution characteristics of hydrodynamic parameters.The study result shows that the formation process of wind driven flow can be divided into three stages:The flow direction is consistent with wind direction,the flow direction deviates from the wind direction in the transitional stage and the current ultimately forms a circulation stable stage.When the flow field is on steady state,the flow direction in most of the waters are in consistent with the wind direction while there are several small scale circulations in central.The bottom current in central is opposite to the surface one with a compensation current character.Overall,the horizontal velocity from the surface to the bottom is decreasing.The inshore velocity is greater than the central one.It shows that the distribution characteristics of hydro-dynamic parameters in high salinity lake are similar to that of fresh water.Increased water salinity has no effect on the structure of lake circulation.
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Key words:
- high salinity lake /
- wind-driven flow /
- 3D mathematical model
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[1] SIMONS T J.Development of three-dimensional numerical model of the Great Lakes[J].Burlington:Canada Centre for Inland Waters,1973. [2] 李一平.水动力作用下太湖底泥起动规律研究[J].水科学进展,2004,15(6):770-774.(Ll Yi-ping.Study on the starting Drinciples of sediment by water force in Taihu Lake[J].Advance in Water Science,2004,15(6):770-774.(in Chinese)) [3] 龚政,张长宽,金勇,等.长江口斜压诊断模式三维流场数值模拟[J].水科学进展,2004,15(3):300-306.(GONG Zheng,ZHANG Chang-kuan,JIN Yong,et al.3-D current numerical model for the Yangtze River estuary with baroclinic diagnosis mode[J].Advance in Water Science,2004,15(3):300-306.(in Chinese)) [4] 匡翠萍,高健博,刘曙光,等.贝加尔湖典型风况下三维流场数值模拟[J].人民长江,2010,41(3):99-106.(KUANG Cui-ping.GAO Jian-bo,LIU Shu-guang,et al.Numerical simulation of 3D wind-driven current in Lake Baikal under typical wind condition[J].Yangtze River,2010,41(3):99-106.(in Chinese)) [5] 韩红娟,胡维平,晋义泉.风速变化对竹湖流场结构影响的数值试验[J].海洋与湖沼,2008,39(6):567-576.(HAN Hong-juan,HU Wei-ping,JIN Yi-quan.Numerical experiments of influence of wind speed on current in lake[J].Oceanologia Et Limnologia Sinica,2008,39(6):567-576.(in Chinese)) [6] 周婕,曾诚,王玲玲.风应力拖曳系数选取对风生流数值模拟的影响[J].水动力学研究与进展:A辑,2009,24(4):440-447.(ZHOU Jie.ZENG Cheng,WANG Ling-ling.Influence of wind drag coefficient on wind-drived flow simulation[J].Journal of Hydrodynamics:Ser A,2009,24(4):440-447.(in Chinese)) [7] HAN long-xi,LI Ya-juan.3-D numerical simulation of turbulent flow affected by Three Gorge Project under construction[J].Journal of Hydrodynamics:Ser B,2002,14(1):113-116. [8] 韩龙喜.三峡大坝施工期水环境三维数值预测方法[J].水科学进展,2002,13(4):427-432.(HAN Long-xi.3-D numerical simulation for water environment in the region of Three Goge Project during construction period[J].Advances in Water Science,2002,13(4):427-432.(in Chinese)) [9] KOUTITAS C,O'CONNOR B.Modeling three-dimensional Wind-induce flows[J].J Hydraulic Division,ASCE,1980,106(11):1843-1865. [10] 胡维平,濮培民,秦伯强.太湖水动力学三维数值试验研究:2:典型风场风生流的数值计算[J].湖泊科学,1998,10(4):26-34.(HU Wei-ping,PU Pei-min,QIN Bo-qiang.A three-dimensional numerical simulation on the dynamics in Taihu Lake,China:Ⅱ:The typical wind-driven current and its divergence[J].Journal of Lake Sciences,1998,10(4):26-34.(in Chinese)) -
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