长江重庆主城区段突发水污染事故模拟研究
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作者单位:

重庆大学 三峡库区生态环境教育部重点实验室

作者简介:

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中图分类号:

X522

基金项目:

重庆市科技计划项目(cstc2017jcyjAX0025)


Simulation of emergent water pollution accident in Chongqing Section of Yangtze River
Author:
Affiliation:

Key Laboratory of Eco-environment of Three Gorges Region of Ministry of Education,Chongqing University

Fund Project:

Chongqing Science and Technology Plan Project(cstc2017jcyjAX0025)

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    摘要:

    因重庆山城特殊的地势,主城区沿长江和嘉陵江两岸建有多种形式的排水干管,一旦发生管道破裂将危机下游水厂取水口的水质安全。在三峡水库蓄水至175米水位后,针对长江重庆主城区段可能发生的突发水污染事故,基于实测地形、水文等数据,构建二维水动力水质耦合模型,采用优化反演法对参数河道糙率等进行率定,借助有限元法分别模拟河流在丰、枯水期管道破裂事故发生后在24h或48h完全修复的情况下,各类污染物(BOD5、COD、TN、TP)浓度随时间和空间的变化。模拟结果可为重庆主城突发排水干管破裂的应急预案优化提供科学依据。

    Abstract:

    Due to the special terrain of Chongqing City, various types of drainage trunks have been built along the Yangtze River and Jialing River. Once pipeline bursts, it will endanger the water quality of downstream water intake. After the impoundment of the Three Gorges Reservoir to 175 meters, aiming at the sudden water pollution that may occur in in Chongqing Section of Yangtze River, a two-dimensional hydrodynamic water quality coupling model was built based on the measured topographic and hydrological data, and using optimal inversion method to determine the roughness. The finite element method is used to simulate the temporal and spatial variations of pollutant concentrations (BOD5, COD, TN, TP) under the conditions that the fractured pipeline was completely repaired after 24h or 48h in the high and low water periods. The simulation results can provide a scientific basis for the optimization of the emergency plan under the sudden drain pipe rupture in Chongqing.

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历史
  • 收稿日期:2019-06-20
  • 最后修改日期:2019-08-14
  • 录用日期:2019-08-18
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