Journal of Jilin University(Earth Science Edition) ›› 2021, Vol. 51 ›› Issue (2): 505-515.doi: 10.13278/j.cnki.jjuese.20190208

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Application of 1-Dimensional Water Quality Model Combined with the Improved Export Coefficient Method in Polluting Load Estimation of Non-Point Source Pollution

Zhou Rui1, Wang Bo1, Lin Haodong1, Yang Jizhou1, Wei Daming2   

  1. 1. College of New Energy and Environment, Jilin University, Changchun 130021, China;
    2. Chinese Academy of Environmental Planning, Beijing 100021, China
  • Received:2019-09-25 Published:2021-04-06
  • Supported by:
    Supported by the National Major Science and Technology Program for Water Pollution Control and Treatment(2018ZX07111001)

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Abstract: Non-point source (NPS) pollution is one of the key source pollution that leads to the deterioration of water quality in watersheds. In order to estimate the non-point source pollution load, CODMn and NH3-N were taken as the representative indexes, the 1-dimensional water quality model was applied to separate the point source pollution load and the NPS pollution load from water quality monitoring sections,and combined with the improved export coefficient method to estimate the NPS pollution load in the basin. The application results from the downstream of the Chao River basin were compared with that of the traditional hydrological segmentation method combined with the improved export coefficient method. It is shown that the Nash coefficients of the 1-dimensional water quality model combined with the improved export coefficient method are both over 0.8 to estimate the simulated values of NPS pollution load of CODMn and NH3-N, which shows a high simulation accuracy; At the same time, it avoids the shortcomings that the hydrological segmentation method cannot be used to simulate the NPS pollution load in dry season. The result shows that 1-dimensional water quality model combined with improved export coefficient method is a reasonable method to estimate different non-point source pollution loads, this method can be used to predict the NPS pollution load in the basin based on the hydrological data by the SWAT (soil and water assessment tool) model, and as a supplement to the COD simulation of the SWAT model.

Key words: non-point source pollution, 1-dimensional water quality model, hydrological segmentation method, export coefficient method, soil and water assessment tool

CLC Number: 

  • P641
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