摘要
湖泊流态对区域内污染物分布及其输移扩散有重要影响。为探究风生流和吞吐流共同作用对湖泊环流的影响,以太湖贡湖湾为例,基于MIKE21模型建立二维水动力-水质耦合模型,模拟水动力环流情况,并统计了各区域污染物质量浓度分布范围、面积占比等,总结不同污染物在空间上的质量浓度分布规律。结果表明:以风生流为主导,风生流和吞吐流共同作用下,秋冬季贡湖湾水动力特征为北部逆时针环流、南部顺时针环流,岸边流速高于湖心区域的;污染物质量浓度南部高、北部低,东部至南部沿岸污染物质量浓度高于其他区域的;各区域污染物质量浓度由外环至内环依次降低;受环流以及大贡山、小贡山地形阻挡的协同影响,环流间隙存在两个污染物滞留带;随着引水流量增大,污染物高质量浓度区域面积占比增加,低质量浓度区域面积占比减少;秋冬季节贡湖湾污染物以TN和TP为主,应予以特别关注。
The flow pattern of the lake has an important influence to the distribution,transport and diffusion of the pollution zone in the re⁃gion.In order to explore the influence of wind⁃generated flow and throughput flow to the lake circulation,taking Gonghu Bay of Taihu Lake as an example,based on MIKE21 model,a two⁃dimensional hydrodynamic⁃water quality coupling model was established to simulate hydrody⁃namic circulation,and the concentration distribution range,distribution frequency and area proportion of pollutants in each region were calcu⁃lated,and the concentration distribution law of water quality factors in space was summarized.The results show that under the combined ac⁃tion of wind⁃generated current and throughput current,the hydrodynamic characteristics of Gonghu Bay in autumn and winter are counter⁃clockwise circulation in the north and clockwise circulation in the south,and the coastal velocity is higher than that in the center of the lake.The concentration distribution of the pollution zone is high in the south and low in the north,and the concentration from the east to the south is higher than that in other regions,and there are spatial differences in the concentration range of different regions.The concentration of pol⁃lutants in each region decreases in turn from the outer ring to the inner ring;due to the circulation characteristics and the synergistic influ⁃ence of the topography of big and small Gongshan,there are two pollutant retention zones in the circulation gap;with the increase of water di⁃version,the proportion of high concentration area increases and that of low concentration area decreases;in autumn and winter,the pollutants in Gonghu Bay are mainly TN and TP,which are easy to exceed the standard,which should be paid special attention to.
作者
倘佳舟
李翠梅
肖昭文
张绍广
秦高峰
金国裕
TANG Jiazhou;LI Cuimei;XIAO Zhaowen;ZHANG Shaoguang;QIN Gaofeng;JING Guoyu(Suzhou University of Science and Technology,School of Environmental Science and Engineering,Suzhou 215009,China;Third Construction Co.,Ltd.,China Construction Eighth Bureau,Nanjing 210046,China;Zhongshuike Water Conservancy and Environment Research Institute(Suzhou)Co.,Ltd.,Suzhou 215300,China;Kunshan Water Affairs Group Co.,Ltd.,Suzhou 215347,China)
出处
《人民黄河》
CAS
北大核心
2022年第12期95-100,共6页
Yellow River
基金
国家自然科学基金资助项目(51109153)。
关键词
MIKE21
风生流
吞吐流
湖泊环流
浓度分布
贡湖湾
MIKE21
wind⁃driven current
throughput current
lake circulation
concentration distribution
Gonghu Bay
