DOI: 10.5194/hess-22-3903-2018
论文题名: Contributions of catchment and in-stream processes to suspended sediment transport in a dominantly groundwater-fed catchment
作者: Liu Y. ; Zarfl C. ; Basu N.B. ; Schwientek M. ; Cirpka O.A.
刊名: Hydrology and Earth System Sciences
ISSN: 1027-5606
出版年: 2018
卷: 22, 期: 7 起始页码: 3903
结束页码: 3921
语种: 英语
Scopus关键词: Catchments
; Erosion
; Groundwater
; Hydraulics
; River pollution
; Rivers
; Runoff
; Sediment transport
; Sedimentation
; Shear stress
; Stream flow
; Water quality
; Facilitated transport
; Fate and transport
; Hydrological modeling
; Seasonal variation
; Sediment transport model
; Stream water quality
; Suspended sediment concentrations
; Suspended sediment loads
; Suspended sediments
; agricultural land
; bank erosion
; catchment
; hydrological modeling
; river discharge
; river water
; sediment transport
; stream
; suspended sediment
; Ammer River
; Bavaria
; Germany
英文摘要: Suspended sediments impact stream water quality by increasing the turbidity and acting as a vector for strongly sorbing pollutants. Understanding their sources is of great importance to developing appropriate river management strategies. In this study, we present an integrated sediment transport model composed of a catchment-scale hydrological model to predict river discharge, a river-hydraulics model to obtain shear stresses in the channel, a sediment-generating model, and a river sediment-transport model. We use this framework to investigate the sediment contributions from catchment and in-stream processes in the Ammer catchment close to Tübingen in southwestern Germany. The model is calibrated to stream flow and suspended-sediment concentrations. We use the monthly mean suspended-sediment load to analyze seasonal variations of different processes. The contributions of catchment and in-stream processes to the total loads are demonstrated by model simulations under different flow conditions. The evaluation of shear stresses by the river-hydraulics model allows the identification of hotspots and hot moments of bed erosion for the main stem of the Ammer River. The results suggest that the contributions of suspended-sediment loads from urban areas and in-stream processes are higher in the summer months, while deposition has small variations with a slight increase in summer months. The sediment input from agricultural land and urban areas as well as bed and bank erosion increase with an increase in flow rates. Bed and bank erosion are negligible when flow is smaller than the corresponding thresholds of 1.5 and 2.5 times the mean discharge, respectively. The bed-erosion rate is higher during the summer months and varies along the main stem. Over the simulated time period, net sediment trapping is observed in the Ammer River. The present work is the basis to study particle-facilitated transport of pollutants in the system, helping to understand the fate and transport of sediments and sediment-bound pollutants. © 2018 Author(s). Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/163251
Appears in Collections: 气候变化与战略
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作者单位: Liu, Y., Center for Applied Geoscience, University of Tübingen, Tübingen, 72074, Germany; Zarfl, C., Center for Applied Geoscience, University of Tübingen, Tübingen, 72074, Germany; Basu, N.B., Department of Civil and Environmental Engineering, University of Waterloo, Waterloo, ON N2L 3G1, Canada; Schwientek, M., Center for Applied Geoscience, University of Tübingen, Tübingen, 72074, Germany; Cirpka, O.A., Center for Applied Geoscience, University of Tübingen, Tübingen, 72074, Germany
Recommended Citation:
Liu Y.,Zarfl C.,Basu N.B.,et al. Contributions of catchment and in-stream processes to suspended sediment transport in a dominantly groundwater-fed catchment[J]. Hydrology and Earth System Sciences,2018-01-01,22(7)