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定常风场和吞吐流对乌梁素海流场的影响研究*
王志超,施青松,李兴,李卫平,杨文焕,于玲红
1.内蒙古科技大学;2.内蒙古师范大学内蒙古节水农业工程研究中心
摘要:
风场和吞吐流是浅水湖泊运动的主要驱动力,间接影响着湖区污染物的输移转化。基于二维非结构网格,构建了乌梁素海水动力模型,水深的模拟数据与实测结果拟合较好。通过对比定常风作用下湖流的方向、环流的分布及形式与无风条件下的区别,模拟不同工况吞吐流作用下湖区流速及环流结构的差异,探究定常风和吞吐流对乌梁素海流场的影响。结果表明:乌梁素海在无风条件下出现大面积的滞流区;风场会增加湖流的流速,影响区域主要在西大滩区、东大滩区及湖区南部明水区,产生明显环流,风场是乌梁素海主要的驱动力;SSW与ENE向风场作用下,典型区域产生的环流位置、形态结构相近,方向相反;吞吐流量的增加会增大湖区整体流速,对湖区流场形态、结构影响较小;定常风条件下,吞吐流量的增加(一定范围)会减弱环流强。研究结果也为乌梁素海营养盐、污染物质输移规律研究提供了理论基础。
关键词:  乌梁素海  定常风  吞吐流  水动力模拟
DOI:10.11693/hyhz20201000279
分类号:
基金项目:
THE INFLUENCES OF UNIFORM WIND AND THROUGHPUT FLOW ON THE FLOW FIELD OF WULIANGSUHAI LAKE
Wang Zhichao1,2, Shi Qingsong1,2, Li Xing3, Li Weiping1,2, Yang Wenhuan1,2, Yu Linghong1,2
1.Inner Mongolia University of Science&2.Technology;3.Inner Mongolia Water Saving Agricultural Engineering Research Center of Inner Mongolia Normal University
Abstract:
Wind and throughput flow are the main driving forces of shallow lakes, which indirectly affect the transport and transformation of pollutants in the lake.Based on the two-dimensional unstructured grid, the dynamic model of Wuliangsuhai is built, and the simulation data of water depth fit well with the measured results.By comparing the direction, distribution and form of Lake current under uniform wind with those under windless conditions, the differences of Lake area current speed and circulation structures under different conditions of throughput were simulated, and the influences of uniform wind and throughput on flow field in Wuliangsuhai were explored.The results show that there is a large area of stagnation zone in the Wuliangsuhai under the condition of no wind; the wind will increase the flow rate of the lake current, and obvious circulation will occur in the influenced areas mainly in the West Beach area, East Beach area and the southern open water area of the lake, and the wind field is the main driving force of the Wuliangsuhai; under the action of SSW and ENE directional wind fields, the circulation position and morphological structure in the typical areas are similar, but in the opposite direction;The increase of throughput flow will increase the overall flow rate of the lake area and have little influence on the morphology and structure of the flow field in the lake area. Under uniform wind conditions, the increase of throughput flow (in a certain range) will weaken the circulation intensity.The research results also provide theoretical basis for the research on nutrient and pollutant transport laws of the Wuliangsuhai .
Key words:  Wuliangsuhai  uniform wind  throughput flow  hydrodynamic simulation
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