Volume 6 Issue 3
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Article Navigation >  Water Science and Engineering  > 2013  >  6(3): 250-261
Zu-lin HUA, Wei JI, Ning-ning SHAN, Wei WU. 2013: Pollutant mixing and transport process via diverse transverse release positions in a multi-anabranch river with three braid bars. Water Science and Engineering, 6(3): 250-261. doi: 10.3882/j.issn.1674-2370.2013.03.002
Citation: Zu-lin HUA, Wei JI, Ning-ning SHAN, Wei WU. 2013: Pollutant mixing and transport process via diverse transverse release positions in a multi-anabranch river with three braid bars. Water Science and Engineering, 6(3): 250-261. doi: 10.3882/j.issn.1674-2370.2013.03.002
shu

Pollutant mixing and transport process via diverse transverse release positions in a multi-anabranch river with three braid bars

doi: 10.3882/j.issn.1674-2370.2013.03.002
  • 1.

    Key Laboratory of Integrated Regulation and Resource Development on Shallow Lakes, Ministry of Education, Hohai University, Nanjing 210098, P. R. China

  • 2.

    College of Environment, Hohai University, Nanjing 210098, P. R. China

  • 3.

    National Engineering Research Center of Water Resources Efficient Utilization and Engineering Safety, Hohai University, Nanjing 210098, P. R. China

Funds:  This work was supported by the National Basic Research Program of China (973 Program, Grant No. 2008CB418202), the National Natural Science Foundation of China (Grants No. 50979026 and 51179052), the National Key Technologies R&D Program of China (Grant No. 2012BAB03B04), the Special Fund for Public Welfare Industry of the Ministry of Water Resources of China (Grant No. 201001028), the “Six Talent Peak” Project of Jiangsu Province (Grant No. 08-C), and the Fundamental Research Funds for the Central Universities (Grant No. 2010B15514).
More Information
  • Corresponding author: Zu-lin HUA
  • Received Date: 2012-09-07
  • Rev Recd Date: 2013-04-11
    Abstract
  • A multi-anabranch river with three braid bars is a typical river pattern in nature, but no studies have been conducted to describe mixing characteristics of pollutants in the river. In this study, a physical model of a typical multi-anabranch river with three braid bars was established to explore the pollutant mixing characteristics in different branches. The multi-anabranch reach was separated into seven branches, B1, B2, B3, B4, B5, B6, and B7, by three braid bars. Five tracer release positions located 2.9 m upstream from the inlet section of the multi-anabranch reach were adopted, and the distances from the five positions to the left bank of the upstream main channel were 1/6B, 1/3B, 1/2B, 2/3B, and 5/6B (B is the width of the upstream main channel), respectively. The longitudinal velocities and pollutant concentrations in the seven branches were measured. The planar flow field and mixing characteristics of pollutants from the bottom to the surface in the multi-anabranch river were obtained and analyzed. The results show that the pollutant release positions are the main influencing factors in the pollutant transport process, and the diversion points and pollutant release positions jointly influence the percentage ratios of the pollutant fluxes in branches B1, B2, and B3 to the pollutant flux in the upstream main channel.

     

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