摘要
以云南省凤羽河流域为研究区域,选用SWAT2009模型来定量研究不同子流域划分水平对模型模拟结果的影响。研究表明:在不同的流域划分方案中,产流受到的影响较小,而对泥沙和营养物负荷的影响较大;就该流域而言,径流和泥沙负荷均存在较稳定的子流域划分水平,分别是85和175。而营养物负荷受到的影响较为复杂,但总氮和总磷的负荷量在子流域个数达到15时也趋于稳定;在该流域内,泥沙负荷随子流域划分水平改变主要是由河网密度和河道坡度的变化引起的。
Mathematical modeling has been a major approach and method for the study of agricultural nonpoint-source pollution recently,which explores the spatial distribution of nonpoint-source pollutants and its converting,transforming mechanics.Fengyu river basin in Yunnan Province was selected as a study site,and model SWAT 2009 was applied to evaluate the impacts of different watershed dubdivision levels on the results of model simulation.The results showed：（1）subdivision of watershed had a less influence on runoff yield versus sediment yield and nutrients（;2）in the study area,runoff yield and sediment load had comparatively steady levels of subdivision,the number of which were 85 and 175 respectively,however,impact factors on the load of nutrients were complex.The load of total N and total P started to level off when the number of subdividion reached 15（;3）the change of sediment load caused by watershed division was mainly attributed to the alteration of drainage density and channel slope.
出处
《农业环境科学学报》
CAS
CSCD
北大核心
2012年第10期1986-1993,共8页
Journal of Agro-Environment Science
基金
公益性行业(农业)科研专项经费资助(201003014)
关键词
子流域划分
SWAT
径流
泥沙
营养物
参数集总
watershed subdivision
SWAT
runoff
sediment
nutrient
parameter aggregation
