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Study on estimation method of non-point source pollution load on Island |
MA De-ming1,2, PENG Wen3, CHI Yuan2, SHI Hong-hua2, LI Zheng-guang1,4, LIU Xiao-huan1 |
1. College of Environmental Science and Engineering, Ocean University of China, Qingdao 266100, China; 2. The First Institute of Oceanography, State Oceanic Administration, Qingdao 266061, China; 3. Qingdao No. 6 People's Hospital, Qingdao 266033, China; 4. National deepsea center, State Oceanic Administration, Qingdao 266237, China |
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Abstract An estimation method of non-point source (NPS) pollution load based on watershed unit ideas was discussed in this study. Firstly, extracting the river network data, identifying the watershed boundaries, anddividing the catchment and sub basin using GIS were finished. And then, the data from first step weresuperposed with the thematic maps of land use and used to calculate the area of different land use types in each sub basin. Third, the NPS pollutant load system was constructed using the emissionfactor, the coefficient of the sea and years of rainfall. Also, the slope factor was introduced as the limiting condition. At last, the total amount of pollution load was estimated. The results indicated that the total nitrogen (TN) and total phosphorus (TP) loads of Nanchangshan Island from NPS were respectively 11539kg and 2025kg. For TN loads, the magnitude order of the contribution of NPS was as follows: resident life> atmospheric precipitation> land use> livestock. For TP loads, the magnitude order was as follows: resident life> land use> atmospheric precipitation> livestock. Based on this, the characteristics of NPS and its impact on water environment quality in the island area were discussed. And, it could provide a technique method for the total amount of pollutants controland the healthy development of the island environment.
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Received: 15 February 2016
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