岔口小流域AnnAGNPS模型参数敏感性分析

doi:10.11934/j.issn.1673-4831.2018.03.003

Abstract

Abstract:

Chakou Watershed was located in the typical loess hilly-gully region, and was selected as study area. Ten parameters of AnnAGNPS model were selected for sensitivity analysis, and Morris classification method was used to analyze the sensitivity of the parameters to the simulation results of the model. Based on the results of parameter sensitivity analysis, the model calculation results were verified. The results show that:The number of runoff curves has great positive influence on model output; Channel Manning coefficient and field water-holding capacity have negative influence on model output. The most sensitive parameters affecting the surface runoff output are the number of runoff curves and the field water-holding capacity. The most sensitive parameters affecting the sediment and nutrient output are the number of runoff curves, soil erodibility factor, tillage management factor, topographic factor, and soil and water conservation factor. The spatial distribution of nitrogen and phosphorus pollutants is not consistent, the regional differences are obvious, and the soil nitrogen and phosphorus pools are the main sources of their losses. The model can better reflect the surface runoff process (R²=0.99,Ens=0.99). The results of simulations on sediment, nitrogen and phosphorus are widely inaccurate, but to some extent, it can reflect the trend of soil and water loss and nitrogen and phosphorus pollution, and has certain reference value to the control and management of soil erosion and non-point source pollution.

Key words: AnnAGNPS model, parameter sensitivity, Morris, Chakou Watershed

CLC Number:

LOU Yong-cai, GUO Qing-xia. Sensitivity Analysis of AnnAGNPS Model Parameters in Chakou Watershed[J]. Journal of Ecology and Rural Environment, 2018, 34(3): 207-215.

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Sensitivity Analysis of AnnAGNPS Model Parameters in Chakou Watershed

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