DOI: 10.5194/hess-23-3901-2019
论文题名: Sediment transport modelling in riverine environments: On the importance of grain-size distribution; sediment density; and suspended sediment concentrations at the upstream boundary
作者: Lepesqueur J. ; Hostache R. ; Martínez-Carreras N. ; Montargès-Pelletier E. ; Hissler C.
刊名: Hydrology and Earth System Sciences
ISSN: 1027-5606
出版年: 2019
卷: 23, 期: 9 起始页码: 3901
结束页码: 3915
语种: 英语
Scopus关键词: Ecosystems
; Floods
; Forecasting
; Grain size and shape
; Mixtures
; Particle size
; Rivers
; Sediment transport
; Sedimentation
; Size distribution
; Grain size distribution
; Sediment densities
; Sediment dynamic
; Sediment grain size
; Sediment mixtures
; Sediment transport modelling
; Suspended sediment concentrations
; Suspended sediment properties
; Suspended sediments
; bathymetry
; concentration (composition)
; density current
; fluvial deposit
; fluvial geomorphology
; grain size
; hydrodynamics
; mobilization
; sediment transport
; software
; suspended sediment
; water column
; France
; Normandie
; Orne River
英文摘要: Hydromorphodynamic models are powerful tools for predicting the potential mobilization and transport of sediment in river ecosystems. Recent studies have shown that they are able to predict suspended sediment matter concentration in small river systems satisfactorily. However, hydro-sedimentary modelling exercises often neglect suspended sediment properties (e.g. sediment densities and grain-size distribution), which are known to directly control sediment dynamics in the water column during flood events. The main objective of this study is to assess whether a better representation of such properties leads to an improved performance in the model. The modelling approach utilizes a fully coupled hydromorphodynamic model based on TELEMAC-3D (v7p1) and an enhanced version of the sediment transport module SISYPHE (based on v7p1), which allows for a refined sediment representation (i.e. 10-class sediment mixtures instead of 2-class mixtures and distributed sediment density instead of uniform). The proposed developments of the SISYPHE model enable us to evaluate and discuss the added value of sediment representation refinement for improving sediment transport and riverbed evolution predictions. To this end, we used several model set-ups to evaluate the influence of sediment grain-size distribution, sediment density, and suspended sediment concentration at the upstream boundary on model predictions. As a test case, we simulated a flood event in a small-scale river, the Orne river in north-eastern France. Depending on the model set-up, the results show substantial discrepancies in terms of simulated bathymetry evolutions. Moreover, the model based on an enhanced configuration of the sediment grain-size distribution (10 classes of particle sizes) and with distinct densities per class outperforms the standard SISYPHE configuration, with only two sediment grain-size classes, in terms of simulated suspended sediment concentration. © Author(s) 2019. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/162893
Appears in Collections: 气候变化与战略
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作者单位: Lepesqueur, J., ERIN, LIS T, 41 rue du Brill, Belvaux, L4422, Luxembourg; Hostache, R., ERIN, LIS T, 41 rue du Brill, Belvaux, L4422, Luxembourg; Martínez-Carreras, N., ERIN, LIS T, 41 rue du Brill, Belvaux, L4422, Luxembourg; Montargès-Pelletier, E., LIEC, CNRS Université de Lorraine, UMR 7360, Vandœuvre-lès-Nancy, 54500, France; Hissler, C., ERIN, LIS T, 41 rue du Brill, Belvaux, L4422, Luxembourg
Recommended Citation:
Lepesqueur J.,Hostache R.,Martínez-Carreras N.,et al. Sediment transport modelling in riverine environments: On the importance of grain-size distribution; sediment density; and suspended sediment concentrations at the upstream boundary[J]. Hydrology and Earth System Sciences,2019-01-01,23(9)