摘要：Achieving a sustainable management of sediment fluxes in
existing or proposed reservoirs is a challenging but essential requirement
for dam operators. Such objective is of utmost importance to avoid
sedimentation-related consequences. Numerical modelling is of great
interest to understand the flow and sediment dynamics in a reservoir, to
simulate the long-term evolution of sediment deposits and to evaluate the
efficiency of various management strategies. This paper presents recent
case studies, which validate the feasibility and relevancy of such technical
option. The progresses obtained on essential stages of the numerical
modelling of sediments dynamics in reservoirs are particularly
emphasized. Concerning the distribution of deposits, a promising field
method based on an optimum combination of direct samplings with
acoustic measurements and video auscultations is detailed. Feedbacks are
then provided concerning an innovative device deployed in the field for a
direct measurement of the settling velocity. Issues about the assessment of
calibration parameters are also addressed in this communication. Lab
experiments performed on deposits sampled in several reservoirs provide
practical guidance to evaluate the erosion parameters of sediments. Finally,
several examples of sediment dynamics modelling in reservoirs including
both cohesive and non-cohesive sediment are presented.
其他摘要：Achieving a sustainable management of sediment fluxes in existing or proposed reservoirs is a challenging but essential requirement for dam operators. Such objective is of utmost importance to avoid sedimentation-related consequences. Numerical modelling is of great interest to understand the flow and sediment dynamics in a reservoir, to simulate the long-term evolution of sediment deposits and to evaluate the efficiency of various management strategies. This paper presents recent case studies, which validate the feasibility and relevancy of such technical option. The progresses obtained on essential stages of the numerical modelling of sediments dynamics in reservoirs are particularly emphasized. Concerning the distribution of deposits, a promising field method based on an optimum combination of direct samplings with acoustic measurements and video auscultations is detailed. Feedbacks are then provided concerning an innovative device deployed in the field for a direct measurement of the settling velocity. Issues about the assessment of calibration parameters are also addressed in this communication. Lab experiments performed on deposits sampled in several reservoirs provide practical guidance to evaluate the erosion parameters of sediments. Finally, several examples of sediment dynamics modelling in reservoirs including both cohesive and non-cohesive sediment are presented.
