1. Numerical simulation of flushing of trapped salt water from a bar-blocked estuary
- Author
-
Zhang, Jisheng, Guo, Yakun, Shen, Yongming, and Zhang, Lixiang
- Subjects
Saline waters -- Models ,Saline waters -- Mechanical properties ,Estuaries -- Environmental aspects ,Numerical analysis -- Methods ,Hydraulic measurements -- Evaluation ,Engineering and manufacturing industries ,Science and technology - Abstract
Results of a numerical simulation investigating the complicated flushing process of an isolated trapped volume of salt water from a bar-blocked estuary are presented. A multiphase model, a part of the commercial code FLUENT 6.2, is applied. The governing equations together with initial and boundary conditions and the numerical scheme are described. The time-dependent salt-wedge position, vertical-density distribution, and proportion of total input kinetic energy converted into potential energy are examined for various incoming flow densimetric Froude number and estuary bed slope. The vertical position and thickness of the interfacial mixed layer between freshwater and salt water as well as the local gradient Richardson number are determined from simulated density profiles and velocity fields. The good agreement between the simulated and measured results indicates that the numerical model can be successfully applied to investigate the complex flushing process involving stratified flow. CE Database subject headings: Flushing; Numerical models; Simulation; Salt water; Estuaries; Stratified flow; Boundaries.
- Published
- 2008