DOI: 10.5194/hess-22-71-2018
论文题名: Shallow water table effects on water; sediment; and pesticide transport in vegetative filter strips-Part 2: Model coupling; application; factor importance; and uncertainty
作者: Lauvernet C. ; Munõz-Carpena R.
刊名: Hydrology and Earth System Sciences
ISSN: 1027-5606
出版年: 2018
卷: 22, 期: 1 起始页码: 71
结束页码: 87
语种: 英语
Scopus关键词: Agricultural runoff
; Bandpass filters
; Climate models
; Efficiency
; Groundwater
; Hydraulic conductivity
; Pesticides
; Quality control
; River pollution
; Runoff
; Sediments
; Soil testing
; Soils
; Transport properties
; Uncertainty analysis
; Water pollution
; Water quality
; Agricultural watersheds
; Global sensitivity
; Numerical algorithms
; Pesticide transport
; Saturated hydraulic conductivity
; Sediment characteristic
; Shallow water tables
; Vegetative filter strips
; Infiltration
; boundary condition
; buffer zone
; deep water
; hydraulic conductivity
; infiltration
; overland flow
; pesticide
; pollutant transport
; runoff
; sediment analysis
; shallow water
; soil type
; soil water
; surface water
; uncertainty analysis
; water quality
; water table
; watershed
; France
英文摘要: Vegetative filter strips are often used for protecting surface waters from pollution transferred by surface runoff in agricultural watersheds. In Europe, they are often prescribed along the stream banks, where a seasonal shallow water table (WT) could decrease the buffer zone efficiency. In spite of this potentially important effect, there are no systematic experimental or theoretical studies on the effect of this soil boundary condition on the VFS efficiency. In the companion paper (Munõz-Carpena et al., 2018), we developed a physically based numerical algorithm (SWINGO) that allows the representation of soil infiltration with a shallow water table. Here we present the dynamic coupling of SWINGO with VFSMOD, an overland flow and transport mathematical model to study the WT influence on VFS efficiency in terms of reductions of overland flow, sediment, and pesticide transport. This new version of VFSMOD was applied to two contrasted benchmark field studies in France (sandy-loam soil in a Mediterranean semicontinental climate, and silty clay in a temperate oceanic climate), where limited testing of the model with field data on one of the sites showed promising results. The application showed that for the conditions of the studies, VFS efficiency decreases markedly when the water table is 0 to 1.5m from the surface. In order to evaluate the relative importance of WT among other input factors controlling VFS efficiency, global sensitivity and uncertainty analysis (GSA) was applied on the benchmark studies. The most important factors found for VFS overland flow reduction were saturated hydraulic conductivity and WT depth, added to sediment characteristics and VFS dimensions for sediment and pesticide reductions. The relative importance of WT varied as a function of soil type (most important at the siltyclay soil) and hydraulic loading (rainfallCincoming runoff) at each site. The presence of WT introduced more complex responses dominated by strong interactions in the modeled system response, reducing the typical predominance of saturated hydraulic conductivity on infiltration under deep water table conditions. This study demonstrates that when present, the WT should be considered as a key hydrologic factor in buffer design and evaluation as a water quality mitigation practice. © 2018 Author. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/163341
Appears in Collections: 气候变化与战略
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作者单位: Lauvernet, C., Centre de Lyon-Villeurbanne, 5 Rue de la Doua, Villeurbanne Cedex, 69625, France; Munõz-Carpena, R., University of Florida Agricultural and Biological Engineering, 287 Frazier Rogers Hall, Gainesville, FL 32611-0570, United States
Recommended Citation:
Lauvernet C.,Munõz-Carpena R.. Shallow water table effects on water; sediment; and pesticide transport in vegetative filter strips-Part 2: Model coupling; application; factor importance; and uncertainty[J]. Hydrology and Earth System Sciences,2018-01-01,22(1)