DOI: 10.5194/hess-21-4053-2017
Scopus记录号: 2-s2.0-85027459407
论文题名: Simulating the influence of snow surface processes on soil moisture dynamics and streamflow generation in an alpine catchment
作者: Wever N ; , Comola F ; , Bavay M ; , Lehning M
刊名: Hydrology and Earth System Sciences
ISSN: 10275606
出版年: 2017
卷: 21, 期: 8 起始页码: 4053
结束页码: 4071
语种: 英语
Scopus关键词: Catchments
; Discharge (fluid mechanics)
; Floods
; Groundwater
; Moisture
; Moisture determination
; Moisture meters
; Rain
; Risk assessment
; Risk management
; Runoff
; Snow
; Snow melting systems
; Soil mechanics
; Soil moisture
; Soils
; Stream flow
; Travel time
; Distributed modeling
; Initial soil moisture
; Simulated discharges
; Soil moisture dynamics
; Soil moisture measurement
; Streamflow generations
; Streamflow simulations
; Travel time distributions
; Soil surveys
; alpine environment
; catchment
; discharge
; ground freezing
; groundwater
; hydrological response
; rainfall-runoff modeling
; snowmelt
; snowpack
; soil depth
; soil moisture
; soil water
; streamflow
; travel time
; valley glacier
; Switzerland
英文摘要: The assessment of flood risks in alpine, snow-covered catchments requires an understanding of the linkage between the snow cover, soil and discharge in the stream network. Here, we apply the comprehensive, distributed model Alpine3D to investigate the role of soil moisture in the predisposition of the Dischma catchment in Switzerland to high flows from rainfall and snowmelt. The recently updated soil module of the physics-based multilayer snow cover model SNOWPACK, which solves the surface energy and mass balance in Alpine3D, is verified against soil moisture measurements at seven sites and various depths inside and in close proximity to the Dischma catchment. Measurements and simulations in such terrain are difficult and consequently, soil moisture was simulated with varying degrees of success. Differences between simulated and measured soil moisture mainly arise from an overestimation of soil freezing and an absence of a groundwater description in the Alpine3D model. Both were found to have an influence in the soil moisture measurements. Using the Alpine3D simulation as the surface scheme for a spatially explicit hydrologic response model using a travel time distribution approach for interflow and baseflow, streamflow simulations were performed for the discharge from the catchment. The streamflow simulations provided a closer agreement with observed streamflow when driving the hydrologic response model with soil water fluxes at 30 cm depth in the Alpine3D model. Performance decreased when using the 2 cm soil water flux, thereby mostly ignoring soil processes. This illustrates that the role of soil moisture is important to take into account when understanding the relationship between both snowpack runoff and rainfall and catchment discharge in high alpine terrain. However, using the soil water flux at 60 cm depth to drive the hydrologic response model also decreased its performance, indicating that an optimal soil depth to include in surface simulations exists and that the runoff dynamics are controlled by only a shallow soil layer. Runoff coefficients (i.e. ratio of rainfall over discharge) based on measurements for high rainfall and snowmelt events were found to be dependent on the simulated initial soil moisture state at the onset of an event, further illustrating the important role of soil moisture for the hydrological processes in the catchment. The runoff coefficients using simulated discharge were found to reproduce this dependency, which shows that the Alpine3D model framework can be successfully applied to assess the predisposition of the catchment to flood risks from both snowmelt and rainfall events. © Author(s) 2017. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/79088
Appears in Collections: 气候变化事实与影响
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作者单位: École Polytechnique Fédérale de Lausanne (EPFL), School of Architecture, Civil and Environmental Engineering, Lausanne, Switzerland; WSL Institute for Snow and Avalanche Research (SLF), Davos, Switzerland
Recommended Citation:
Wever N,, Comola F,, Bavay M,et al. Simulating the influence of snow surface processes on soil moisture dynamics and streamflow generation in an alpine catchment[J]. Hydrology and Earth System Sciences,2017-01-01,21(8)