Evaluation on Risk of Non-Point Source Pollution in Dayanghe Watershed Based on GIS

Abstract:

Four indices which include surface runoff, soil erosion, agricultural nutrient loss, human and animal feces were selected and method to evaluate risk of non-point source pollution in watershed was constructed based on GIS. As a case, non-point source pollution in Dayanghe was evaluated. Results showed that very high risk area of non-point source pollution accounted for 3.41% area of the watershed, mainly located in farmland with steep slope along upper valley of the watershed. High risk area of non-point source pollution was located in farmland and human settlement placecs, accounted for 16.40% area of the watershed. Areas with low risk of non-point source pollution was riverbeds, shrub and grassland in eastern and western hilly with steep slope. Areas with lower risk of non-point source pollution located in middle of the watershed and accounted for 60.55% area. GIS-based risk evaluation system of non-point source pollution can reflect real map of pollution in the Dayanghe watershed and give implication for protection plan.

• Periodical: Applied Mechanics and Materials (Volumes 209-211)
• Pages: 2023-2026
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.209-211.2023
• Online since: October 2012
• Authors: An Ning Suo, Hua Ru Wang, Yuan Bin Fu
• Keywords: GIS, Non-Point Source, Pollution, Risk Evaluation, Watershed

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