| 摘要: |
| 三峡水库蓄水后，重庆主城两江汇流河段水质发生较大变化，为研究两江汇流口污染混合区变化规律，采用二维水质模型，基于概化的数值区域，对污染混合区进行数值模拟，分析汇流口污染混合区范围特性.分别从不同保证率、不同排污负荷、不同排污口等方面进行组合分析，以揭示污染混合区的变化特性.结果显示：河道流量越大，污染混合区越长；两江汇流口顺直河段污染混合区相对较长，弯曲河段污染混合区相对较宽，污染混合区范围基本与排污负荷成正比. |
| 关键词: 两江汇流 污染混合区 保证率 |
| DOI： |
| 分类号:X143；X522 |
| 基金项目:国家水体污染控制与治理科技重大专项（2009ZX07104-001） |
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| Analysis of variation in the pollution mixing zone at the confluence of two rivers |
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ZHOU Fu-chun1,2, CHEN Pei-shuai3, LIU Guo-dong4
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1.Institute of Water Conservancy and Hydroelectric Power， Sichuan University;2.School of River and Ocean Engineering， Chongqing Jiaotong University;3.College of Water Conservancy and Hydropower Engineering， Hohai University;4.Surveying and Design Institute of Qiantang River Administration of Zhejiang Province
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| Abstract: |
| After impoundment of the Three Gorges reservoir， there is a great variation in the water quality in two rivers (the Yangtze River and the Jialing River) at the confluence nearby the main urban areas of Chongqing city. In order to study the change law of the pollution mixing zone， a two-dimensional water quality model is used. Based on the generalized numerical area， the pollution mixing zone is simulated numerically and the boundary features are analyzed. Then a comprehensive analysis considering different guarantee rates， different sewage loads and different outfalls is made in order to reveal the characteristic of the pollution mixing zone. The research results show that the larger the reach flow， the longer the pollution mixing zone is， so the straight reach is relatively long and the curved reach is relatively wide in the pollution mixing zone. And the scope of the zone is proportional to the sewage load. |
| Key words: confluence of two rivers pollution mixing zone guarantee rate |
