Numerical simulation of sedimentation processes in reservoirs as a function of outlet location

作     者：Horacio TONIOLO 

作者机构：Civil and Environmental Engineering Department University of Alaska Fairbanks 

出 版 物：《International Journal of Sediment Research》 (国际泥沙研究(英文版))

年 卷 期：2009年第24卷第3期

页      面：339-351页

核心收录：

学科分类：08[工学] 081502[工学-水力学及河流动力学] 0815[工学-水利工程] 

基　　金：Institute of Northern Engineering, University of Alaska Fairbanks under the Research Enhancement Program partially funded this research National Science Foundation-project 0612334 provided additional funds 

主　　题：Numerical model Delta Ponded turbidity currents Outlet location Reservoirs 

摘      要：This paper builds on a recently published one-dimensional moving-boundary model of the coevolution of topset, foreset and bottomset in a reservoir that captures the dynamics of the internal muddy pond typical to reservoirs. This model was modified to account for different outlet locations at the reservoir’s downstream end. This model considers a river carrying two sustained phases of sediments: coarse (sand) and fine (mud). The coarse phase deposits in the topset and delta foreset, while the fine phase forms a dilute suspension of wash load in the river. As the river enters the reservoir, the muddy water plunges on the foreset to form a Froude-supercritical (purely depositional) turbidity current. This turbidity current emplaces the bottomset. The modified numerical model was tested against five laboratory experiments previously reported by the author. The model successfully locates the muddy-water/clear-water interface. In addition, modeled and measured bed deposits are in good agreement. Results clearly indicate that the location of the internal hydraulic jump plays a key role in the final bed deposit.