Numerical simulation of wind-induced entrainment in a stably stratified water basin

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Title:	Numerical simulation of wind-induced entrainment in a stably stratified water basin
Authors:	Chu,CR;Soong,CK
Contributors:	土木工程研究所
Keywords:	MIXED-LAYER;DENSITY INTERFACE;FLOW;TRANSPORT;ANNULUS;CHANNEL;STRESS;FLUID;LAKES
Date:	1997
Issue Date:	2010-06-29 17:10:41 (UTC+8)
Publisher:	中央大學
Abstract:	This study uses a two-dimensional eddy viscosity model to investigate the wind-induced entrainment in a two-layer stably stratified water basin. By changing the background stratification and surface shear stress, the calculated entrainment coefficients E show that when Richardson number Ri* is less than a critical Richardson number Ri(c), entrainment law is in the form of E proportional to Ri(-1). When Ri > Ri(c), molecular diffusion can not be neglected. The value of Ri(c) is around the order of Pe(1/2), where Pe is the Peclet number. Furthermore, three different mechanisms (upwelling, longitudinal dispersion and vertical mixing) are observed in the numerical simulation. By analyzing the time scales of these mechanisms, the interaction among them can be explained. The interaction and the resulted entrainment coefficient are found to be dependent on the aspect ratio of stratified basin.
Relation:	JOURNAL OF HYDRAULIC RESEARCH
Appears in Collections:	[Graduate Institute of Civil Engineering] journal & Dissertation

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