中山大学学报自然科学版 ›› 2011, Vol. 50 ›› Issue (1): 123-128.

• 研究论文 • 上一篇    下一篇

平原河网十字型汊口出入流断面污染物浓度响应关系研究

韩龙喜1,2,3,陆 东3,计 红3   

  1. (1河海大学水文水资源与水利工程科学国家重点实验室, 江苏 南京210098;2 河海大学浅水湖泊综合治理与资源开发教育部重点实验室, 江苏 南京210098;3 河海大学环境科学与工程学院, 江苏 南京 210098)
  • 收稿日期:2009-11-16 修回日期:1900-01-01 出版日期:2011-01-25 发布日期:2011-01-25

Response Relation of Pollutant Concentration Between Outlet and Inlet Sections at Joint Nodes of Plain River Network

HAN Longxi 1,2,3,LU Dong 3,JI Hong 3   

  1. (1 State Key Laboratory of HydrologyWater Resource and Hydraulic Engineering,Nanjing 210098, China;2 Key Laboratory of Integrated Regulation and Resource Development on Shallow Lakes, MOE,Nanjing 210098,China;3 College of Environmental Science and Engineering, Hohai University, Nanjing 210098,China)
  • Received:2009-11-16 Revised:1900-01-01 Online:2011-01-25 Published:2011-01-25

摘要: 在平原河网地区,十字型汊口是不同河道间实行水量与污染物交换的重要水域,而出、入流断面污染物浓度间的响应关系,是模拟平原河网水质时空变化的一个十分重要的技术参数。本文通过十字型水槽物理模型,对“两进两出”十字型汊口二维水动力、水质数学模型进行验证。结果表明,在“两进两出”十字型汊口不同出流断面的污染物平均浓度存在较大差异。在此基础上,提出了新的该类型汊口出入流断面污染物平均浓度间的响应关系,给出了响应系数计算公式。将利用本文方法得出的响应系数与常用的三级联解法基于“汊口污染物均匀混合假设”得出的响应系数进行了对比,突显了三级联解法的误差。本文的研究成果可为平原河网水质模拟方法的改进提供依据。

关键词: 河网, 十字型汊口, 污染物浓度, 响应关系

Abstract: In plain river network, joint nodes can not be ignored for exchange of water flow and pollutants from different watercourses. Response relation between outlet sections and inlet sections is an important technical parameter for water quality simulation. Aiming at the response relation research of crossed joint nodes with two inlet sections and two outlet sections, this paper builds 2-D hydraulic and water quality mathematical models and validates them by physical models. The results show that pollutant concentration differs greatly for different outlet sections. Based on the work above, a new expression of response relation and calculating equations of response coefficients are put forward. By comparing the response coefficients with those inferred from even mixing hypothesis mainly used in threestep method, obvious errors caused by even mixing hypothesis are disclosed.This study helps to improve the simulation method of plain river network water quality.

Key words: plain river network, crossed joint nodes, pollutant concentration, response relation

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