子流域划分对SWAT模型模拟结果的影响研究  

Influence of different sub-watershed division schemes on simulation results of SWAT model

作　　者：陈肖敏[1] 郭平[2] 彭虹[3] 王永桂[1] 蔡锋[2] 

机构地区：[1]武汉大学资源与环境科学学院,湖北武汉430079 [2]重庆市环境科学研究院,重庆401147 [3]武汉大学水资源与水电工程科学国家重点实验室,湖北武汉430072

出　　处：《人民长江》2016年第23期44-49,共6页Yangtze River

基　　金：国家"十二五"重大科技专项项目(2013ZX07503-001)

摘　　要：基于分布式水文模型SWAT,选择三峡库区支流大宁河为研究区域,在不同的子流域划分数量条件下,进行流域径流、泥沙以及营养物模拟计算,进而分析子流域划分对模拟结果的影响。研究结果表明：①不同子流划分方案对SWAT模型模拟结果存在直接影响。对于所研究流域,径流、TN和TP受到的影响较小,泥沙受到的影响较大。②为体现流域的真实河网水系特征,保证模拟效果,子流域划分个数不宜过少或过多。③在不同流域,子流域划分数目对径流、泥沙和营养物的变化趋势影响不同,不可同一而论。④推荐大宁河的子流域划分个数为37~121个。The distributed hydrological model - SWAT （ Soil and Water Assessment Tool） is applied to analyze the influence of different sub -watershed division schemes on runoff yield, sediment yield and nutrient load in the Daning River watershed, a tributary of the Three Gorges Reservoir area. The results show that： ① The simulation results are directly affected by the division of sub - watershed in SWAT model. For the object area, the runoff yield, TN and TP load are slightly affected while the sediment yield is heavily affected. ② In order to reflect the real characteristics of the drainage network, sub - watershed division number should not be too little or too much. ③ The changing trend of simulation results are differently influenced by the subdivision level in different watershed. ④ The sub - watershed division number of Daning River is suggested to range from 37 to 121.

关 键 词：子流域划分 SWAT模型 径流 泥沙 营养物 

分 类 号：P33[天文地球—水文科学]