
Parameters sensitivity and applicability evaluations of AnnAGNPS model in a small watershed of the Yangtze River Delta
ZHANG Shuifeng, ZHANG Jinchi, ZHUANG Jiayao, WANG Xinmeng, ZHANG Siyu
JOURNAL OF NANJING FORESTRY UNIVERSITY ›› 2021, Vol. 45 ›› Issue (3) : 183-192.
Parameters sensitivity and applicability evaluations of AnnAGNPS model in a small watershed of the Yangtze River Delta
【Objective】 The sensitivity and applicability of the agricultural non-point source pollution model AnnAGNPS to the Peiqiao River watershed were studied to provide data supports and a scientific basis for the comprehensive watershed management in the Yangtze River Delta. 【Method】 The study area is Peiqiao River watershed of Shuiyang River system in the middle and lower reaches of the Yangtze River. A differential sensitivity analysis (DSA) method was used for a parameter sensitivity analysis, and the applicability of the model was comprehensively evaluated using correlation coefficient (R2), efficiency coefficient (E) and relative error (ER). 【Result】 The parameter with the highest degree of output sensitivity to runoff, total nitrogen, total phosphorus and sediment in the studied area was the curve number (CN). Soil erosion factor (K), soil and water conservation factor (P), and crop management factor (C), all had positive correlations and effects. The R2 and E of runoff, sediment, total nitrogen, and total phosphorus in the flood season and non-flood season from 2015 to 2018 were all greater than 0.80, and the absolute value of ER was less than 12%. The simulation accuracy of runoff and sediment in the flood season was higher than that in the non-flood season, while the simulation accuracy of total nitrogen and total phosphorus in the non-flood season was slightly higher than that in the flood season. 【Conclusion】The calibrated AnnAGNPS model has a good simulation effect and reliable results in the Peiqiao River watershed and could be used to assist decision-makings on non-point source pollution and soil erosion management in a small agricultural watershed of the hill region of the Yangtze River Delta.
agricultural small watershed of the Yangtze River Delta / agricultural non-point source pollution model (AnnAGNPS) / parameters sensitivity / applicability evaluation / Peiqiao River watershed
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