DOI: 10.5194/hess-18-2629-2014
Scopus记录号: 2-s2.0-84904679572
论文题名: Applying SWAT to predict ortho-phosphate loads and trophic status in four reservoirs in the upper Olifants catchment, South Africa
作者: Dabrowski J ; M
刊名: Hydrology and Earth System Sciences
ISSN: 10275606
出版年: 2014
卷: 18, 期: 7 起始页码: 2629
结束页码: 2643
语种: 英语
Scopus关键词: Catchments
; Computer simulation
; Effluent treatment
; Eutrophication
; Forecasting
; Regression analysis
; River pollution
; Runoff
; Sewage treatment
; Soil moisture
; Standards
; Ecosystem health
; Geographical area
; ITS applications
; Model performance
; Multi-site calibration
; Non-point source
; Sewage treatment works
; Soil water assessment tool
; Loading
英文摘要: Excessive phosphate loading in the upper Olifants River, South Africa has resulted in widespread eutrophication and associated ecosystem health impacts. The majority of sewage treatment works (STWs) are operating poorly and are likely an important source of bioavailable ortho-phosphate (OP) in the catchment. The Soil Water Assessment Tool (SWAT) was used to identify important sources of OP loading in the catchment and to predict changes in the trophic status of four reservoirs associated with three STW effluent OP standards (the current average of 4 mg Lg-1 and standards of 1 and 0.1 mg Lg -1). Nash-Sutcliffe and PBIAS statistics showed good model performance for simulations of flow and OP loading using a multi-site calibration and validation approach. Key sub-catchments responsible for high OP loading were identified. Three of the four reservoirs are heavily impacted by OP loading originating from STWs. Two reservoirs show mean annual OP concentrations indicative of eutrophic conditions and a 1 mg Lg-1 effluent standard would reduce concentrations to well within the mesotrophic range. There was little difference in OP loads and concentrations associated with the 1 and 0.1 mg Lg-1 effluent standards, indicating that attention to nonpoint sources would be required to realise any benefit associated with the strictest effluent standard. Regression analyses and associated 95% prediction limits between simulated OP loads and concentrations for all effluent treatment scenarios from 2002 to 2010 allowed for the quantification of OP loading that would ensure a specific trophic status in each reservoir. This study is one of the first to apply SWAT in simulating OP loading and concentrations in large reservoirs, and its application in South Africa provides further support for its utility throughout a wide geographical area. © 2014 Author(s). Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/78192
Appears in Collections: 气候变化事实与影响
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作者单位: Natural Resources and Environment, CSIR, P.O. Box 395, 0001 Pretoria, South Africa
Recommended Citation:
Dabrowski J,M. Applying SWAT to predict ortho-phosphate loads and trophic status in four reservoirs in the upper Olifants catchment, South Africa[J]. Hydrology and Earth System Sciences,2014-01-01,18(7)