Evaluation of Distribution Properties of Non-Point Source Pollution in a Subtropical Monsoon Watershed by a Hydrological Model with a Modified Runoff Module

doi:10.3390/w11050993

CORC > 南海海洋研究所 > 中国科学院南海海洋研究所 > 热带海洋环境国家重点实验室(LTO)

	Evaluation of Distribution Properties of Non-Point Source Pollution in a Subtropical Monsoon Watershed by a Hydrological Model with a Modified Runoff Module
	Chen, Zhonghan ; Zhang, Zhou ; Huang, Ping ; Li, Junmin 1
刊名	WATER
	2019
卷号	11 期号:5 页码:993
关键词	non-point source critical source areas watershed runoff simulation distributed hydrological model SWAT
ISSN号	2073-4441
DOI	10.3390/w11050993
英文摘要	Non-point source pollution (NPS) is difficult to manage for watersheds, due to the scattering of pollution sources and uncertainty over the time it takes to accumulate. Since local agriculture and poultry rearing prevail, NPS occupies a large proportion of local pollution. In this paper, we modified the runoff module of the Soil and Water Assessment Tool (SWAT) to study the distribution properties and the effect of control of NPS in the Binjiang watershed in Southern China. The model was run from 2005 to 2014. The runoff simulation's accuracy had apparently improved compared to the original model, as the Nash coefficient (Ens) had improved from 0.72 to 0.89, and the determination coefficient (R-2) had improved from 0.75 to 0.91, an improvement in accuracy of 23.61% (Ens) and 21.33% (R-2). Thus, the modified model (SWAT-m) is more adaptable for the simulation of extensive non-urban watersheds in subtropical monsoon climates. The validated model was used in further analysis. The results show that 82-90% of total nitrogen and 83-89% of total phosphorus were concentrated in the period from April to September annually. Through the introduction of the pollution generation potential parameter phi(i), we obtained the descending order of all sub-basins in terms of their pollution generation potential. The critical source areas (CSAs) were found to be the northeast sub-basins in lower terrain that is used mainly for agricultural applications, accounting for 53% of the total watershed. The accumulation time is April to July, occupying 69% of annual generation. The simulation of management measures showed that NPS control has a good effect, with a 15 m filter strip in CSAs. Ammonia nitrogen and total phosphorus can be reduced apparently by 32% and 43%, respectively. The results may provide support for the management of NPS in watersheds under similar conditions.
内容类型	期刊论文
源URL	[http://ir.scsio.ac.cn/handle/344004/17725]
专题	南海海洋研究所_热带海洋环境国家重点实验室(LTO)
作者单位	1.Sun Yat Sen Univ, Dept Environm Sci & Engn, Guangzhou 510275, Guangdong, Peoples R China 2.Chinese Acad Sci, South China Sea Inst Oceanol, State Key Lab Trop Oceanog, Guangzhou 510301, Guangdong, Peoples R China
推荐引用方式 GB/T 7714	Chen, Zhonghan,Zhang, Zhou,Huang, Ping,et al. Evaluation of Distribution Properties of Non-Point Source Pollution in a Subtropical Monsoon Watershed by a Hydrological Model with a Modified Runoff Module[J]. WATER,2019,11(5):993.
APA	Chen, Zhonghan,Zhang, Zhou,Huang, Ping,&Li, Junmin.(2019).Evaluation of Distribution Properties of Non-Point Source Pollution in a Subtropical Monsoon Watershed by a Hydrological Model with a Modified Runoff Module.WATER,11(5),993.
MLA	Chen, Zhonghan,et al."Evaluation of Distribution Properties of Non-Point Source Pollution in a Subtropical Monsoon Watershed by a Hydrological Model with a Modified Runoff Module".WATER 11.5(2019):993.