DOI: 10.5194/hess-24-213-2020
论文题名: Assessing the perturbations of the hydrogeological regime in sloping fens due to roads
作者: Cochand F. ; Käser D. ; Grosvernier P. ; Hunkeler D. ; Brunner P.
刊名: Hydrology and Earth System Sciences
ISSN: 1027-5606
出版年: 2020
卷: 24, 期: 1 起始页码: 213
结束页码: 226
语种: 英语
Scopus关键词: Dynamics
; Numerical models
; Roads and streets
; Wetlands
; Electrical conductivity
; Field measurement
; Hydraulic barrier
; Physically based modeling
; Qualitative assessments
; Relative rankings
; Surface and subsurface flow
; Systematic analysis
; Highway planning
; electrical conductivity
; fen
; flow pattern
; gully erosion
; hydraulic conductivity
; hydrological regime
; numerical model
; road construction
; slope
; subsurface flow
; tracer
; Switzerland
英文摘要: Roads in sloping fens constitute a hydraulic barrier for surface and subsurface flow. This can lead to the drying out of downslope areas of the sloping fen as well as gully erosion. Different types of road construction have been proposed to limit the negative implications of roads on flow dynamics. However, so far, no systematic analysis of their effectiveness has been carried out. This study presents an assessment of the hydrogeological impact of three types of road structures in semi-alpine, sloping fens in Switzerland. Our analysis is based on a combination of field measurements and fully integrated, physically based modeling. In the field approach, the influence of roads was examined using tracer tests in which the area upslope of the road was sprinkled with a saline solution. The spatial distribution of electrical conductivity downslope provided a qualitative assessment of the flow paths and, thus, the implications of the road structures on subsurface flow. A quantitative albeit not site-specific assessment was carried out using fully coupled numerical models jointly simulating surface and subsurface flow processes. The different road types were implemented and their influence on flow dynamics was assessed for a wide range of slopes and different hydraulic conductivities of the soil. The models are based on homogenous soil conditions, allowing for a relative ranking of the impact of the road types. For all cases analyzed in the field and simulated using the numerical models, roads designed with an L drain (i.e., collecting water upslope and releasing it in a concentrated manner downslope) constitute the largest perturbations in terms of flow dynamics. The other road structures investigated were found to have less impact. The developed methodologies and results can be used for the planning of future road projects in sloping fens. © 2020 Author(s). Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/162816
Appears in Collections: 气候变化与战略
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作者单位: Cochand, F., Centre of Hydrogeology and Geothermics, Université de Neuchâtel, Neuchâtel, Switzerland; Käser, D., Centre of Hydrogeology and Geothermics, Université de Neuchâtel, Neuchâtel, Switzerland; Grosvernier, P., LIN'eco, ecological engineering, P.O. Box 80, Reconvilier, 2732, Switzerland; Hunkeler, D., Centre of Hydrogeology and Geothermics, Université de Neuchâtel, Neuchâtel, Switzerland; Brunner, P., Centre of Hydrogeology and Geothermics, Université de Neuchâtel, Neuchâtel, Switzerland
Recommended Citation:
Cochand F.,Käser D.,Grosvernier P.,et al. Assessing the perturbations of the hydrogeological regime in sloping fens due to roads[J]. Hydrology and Earth System Sciences,2020-01-01,24(1)