GIS and L-THIA Based Change Analysis of Small Watershed Non-Point Pollution in Liaohe River Source Area

doi:10.11924/j.issn.1000-6850.casb15080102

Abstract

Abstract: Agricultural non-point source pollution is one of the great causes of water quality deterioration. The authors chose the Liaohe River source area as the research objective and took the research of small watershed of Liaohe River as key task. The authors estimated the output load of non-point source pollution of total nitrogen, nitrate nitrogen, total phosphorus, COD and soluble phosphorus based on Long-Term Hydrologic Impact Assessment (L-THIA) model and GIS spatial analysis technology with the land status and daily rainfall data. The results showed that the spatial distributions of unit grid pollution output load of total nitrogen, nitrate nitrogen and total phosphorus were consistent, but the output loads of soluble phosphorus and COD were different. Regional agricultural non-point source pollution was mainly concentrated in farmland and idle land. The distribution influence of survey data was bigger when this region was arid, the contribution rates of total nitrogen, nitrate nitrogen and total phosphorus were 82.57%, 80.02% and 92.92%. The effect of village and town land on soluble phosphorus pollution load distribution was the biggest and paddy field had obvious effect on COD output load. According to different pollution output loads and the current land use situation, based on the support of GIS spatial overlay and fusion technology, the research area could be divided into four non-point source pollution control areas, the results could offer scientific basis for non-point source pollution control.

CLC Number:

Lv Chuan,Chen Minghui and Qi Lin. GIS and L-THIA Based Change Analysis of Small Watershed Non-Point Pollution in Liaohe River Source Area[J]. Chinese Agricultural Science Bulletin, 2016, 32(6): 106-112.

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