One-Dimensional Modeling of Suspended Sediment Dynamics in Dam Reservoirs

AbstractContinuous sedimentation of fine sediments in dam reservoirs triggers considerable economic and ecological impacts worldwide. The definition of appropriate reservoir management procedures requires accurate tools for predicting the sediment dynamics both in the reservoir and downstream reaches. In this article, a one-dimensional numerical model aiming to reproduce suspended sediment dynamics is presented. To take into account water intake locations and vertical distribution of suspended sediments in areas of larger water depths close to dams, an additional module is developed. The model is applied to a reach of the French Upper Rhone River, including two reservoirs. The calibrated model provides accurate flux estimates and reproduces erosion and deposition patterns observed in the reservoir for several scenarios. The additional module allows to improve the estimation of the sand load released by low-level outlets. Eventually, the model could be used either to provide insights on the outcome of past...

[1]  W. Salomons,et al.  Fine‐grained sediment in river systems: environmental significance and management issues , 2005 .

[2]  K. Ashida,et al.  Environmental impacts of coordinated sediment flushing , 2004 .

[3]  Daniel P. Loucks,et al.  Maintaining Sediment Flows through Hydropower Dams in the Mekong River Basin , 2016 .

[4]  Yongtao Cao,et al.  Sustainable sediment management in reservoirs and regulated rivers: Experiences from five continents , 2014 .

[5]  Arthur J Horowitz,et al.  Determining annual suspended sediment and sediment-associated trace element and nutrient fluxes. , 2008, The Science of the total environment.

[6]  P. Armitage,et al.  Biological Effects of Fine Sediment in the Lotic Environment , 1997, Environmental management.

[7]  I. Ko,et al.  Effect of reservoir flushing on downstream river water quality. , 2008, Journal of environmental management.

[8]  Howard H. Chang,et al.  Numerical Modeling for Sediment-Pass-Through Reservoirs , 1996 .

[9]  C. Wentworth.  A Scale of Grade and Class Terms for Clastic Sediments , 1922, The Journal of Geology.

[10]  H. Fang,et al.  Three-dimensional calculations of flow and suspended sediment transport in the neighborhood of the dam for the Three Gorges Project (TGP) reservoir in the Yangtze River , 2003 .

[11]  Fred J. Molz,et al.  Multimodality of a particle size distribution of cohesive suspended particulate matters in a coastal zone , 2012 .

[12]  C. K. Ziegler,et al.  Long-Term Simulation of Fine-Grained Sediment Transport in Large Reservoir , 1995 .

[13]  Emmanuel Partheniades,et al.  Erosion and Deposition of Cohesive Soils , 1965 .

[14]  L. Rijn.  Sediment Transport, Part II: Suspended Load Transport , 1984 .

[15]  Guangqian Wang,et al.  Sedimentation problems and management strategies of Sanmenxia Reservoir, Yellow River, China , 2005 .

[16]  E. Castelli,et al.  Effects of suspended sediments from reservoir flushing on fish and macroinvertebrates in an alpine stream , 2009, Aquatic Sciences.

[17]  Aronne Armanini,et al.  A one-dimensional model for the transport of a sediment mixture in non-equilibrium conditions , 1988 .

[18]  André Paquier,et al.  Long term evolution of a dam reservoir subjected to regular flushing events , 2014 .

[19]  Benoît Camenen,et al.  Simple and General Formula for the Settling Velocity of Particles , 2007 .

[20]  Gregory L. Morris,et al.  Reservoir Sedimentation. II: Reservoir Desiltation and Long‐Term Storage Capacity , 1992 .

[21]  Magnus Larson,et al.  A General Formula for Noncohesive Suspended Sediment Transport , 2008 .

[22]  Gerard Nicollet,et al.  Écoulements permanents à surface libre en lits composés , 1979 .