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| DOI：10.13522/j.cnki.ggps.20180386 |
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| Analyzing Non-point Pollution in Areas with Scarce Data Using Modified Output-coefficient Model |
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HU Zheng，AO Tianqi，LI Mengrui, HU Fuchang, LIU Lingxue
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1.College of Water Resources & Hydropower, Sichuan University, Chengdu 610065, China;2.State Key Laboratory of Hydraulics and Mountain River Engineering, Sichuan University, Chengdu 610065, China
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| Abstract: |
| 【Objective】Lack of data is a common issue facing water environmental assessment and in this paper we present a method to assess non-point pollution sources in regions with insufficient data. 【Method】An improved output coefficient model considering rainfall and topography was proposed. Using ArcGIS and the method of equivalent pollution load, we calculated the pollution of total nitrogen (TN) and total phosphorus (TP) originating from domestic sewage in rural areas, farmland surface runoff, livestock farming, urban surface runoff, urban sewage and industrial pollution in the catchment within Qiu county.【Result】①Non-point pollution is the main pollution in the studied area, with TN and TP output being 503.84 t/a and 53.85 t/a respectively without noticeable spatial variation. Pollution from residential sewage accounted for 49.39% of the total pollution load. ②Verification of the improved output coefficient model showed that its relative error in calculating TN and TP was 10.87% and 13.86% respectively.【Conclusion】The improved model is able to comprehensively evaluate surface pollution sources in areas with data scarcity. |
| Key words: non-point source pollution; improved output coefficient model; pollution load; Quxian |
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