Case study of watershed pollution load distribution based on coupling model

Watershed pollution load distribution is an important measure to implement watershed fine management.In order to quantitatively describe the significance of assessment indicators on the distribution of pollution load in river basin,the random forest algorithm was adopted to evaluate the importance of the selected indicators.The evaluation indices,which can reflect all the influence factors,were selected based on their importance,then,the weight coefficient of each indicator was further determined based on its score.The coupling model of pollution load distribution is constructed by combining the evaluation index system with the environmental gini coefficient model.Additionally, allocation plan of COD load was formulated based on control unit in the target Qingyi river basin (Xuchang Section).We found that the indicators,which fulfill the requirements ofimportance score,include per capita income,sewage production per unit of GDP,water [JP]consumption of industrial and enterprises,the amount of surface water resources and area of control-unit, and the scores are 13.97,9.65,8.77,5.21 and 1.09,respectively.The allocation plan of COD load in the river basin on 2020 was further formulated based on the coupling model,and the pollutant reduction and reduction rate of the control-unit QYH-3 are the largest,which are 617.14 t/a and 30.44 %,respectively.The allocation plan is reasonable for reflecting the actual situation of the basin.

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