Estimation of non-point source pollution loads by improvising export coefficient model in watershed with a modified planting pattern

3rd International Conference on Water Resource and Environment

地球科学;生态环境科学

Dong, F.^1,2 ; Liu, X.B.^1,2 ; Peng, W.Q.^1,2 ; Wang, L.^3

State Key Laboratory of Simulation and Regulation of Water Cycle in River Basin, Beijing, China^1

Department of Water Environment., China Institute of Water Resources and Hydropower Research, Beijing, China^2

Bureau of Water Resources of Binzhou, Binzhou, China^3

关键词: Agricultural watersheds;    Bioactive ingredients;    Cropping patterns;    Emission reduction;    Export coefficient models;    Non-point source pollutants;    Non-point source pollution;    Reduction coefficient;   

Others  :  https://iopscience.iop.org/article/10.1088/1755-1315/82/1/012068/pdf
DOI  :  10.1088/1755-1315/82/1/012068

学科分类：环境科学（综合）

来源: IOP

【 摘 要 】

Export coefficient model was improved to calculate and compare non-point source pollution loads in an agricultural watershed before and after implanting new cropping pattern. The modification was done by introducing the reduction coefficient in consumption amount and loss load as well as the proportion of bioactive ingredients of fertilizer and pesticide to the export coefficient model developed by Johnes in 1996. The modified export coefficient model was then applied to estimate non-point source pollution load in Gaoxi community, Yunnan Province, China where a water-saving and emission reduction technology was implemented by changing cropping pattern. Study results showed that the improved export coefficient model had a favorable flexibility in calculating the non-point source pollution loads and well applicable to the watersheds where various input data is in short. Moreover, the findings will provide scientific basis to understand the variability of non-point source pollutants in agricultural watersheds and their load estimation in order to optimize the efficiency of pollutants reduction plan implemented through agricultural adjustment.