Dynamics of Temperature Stratification in Lowland Rivers

Abstract

In this paper the stratification dynamics of a river channel are described and modeled using a two-dimensional, primitive equation, circulation model that incorporates a turbulence closure scheme. The model is applied to a weir pool on the Murrumbidgee River and to an open section of the River Murray, Australia. Excellent agreement between measured and simulated temperature profiles under a wide range of river discharge and meteorological forcing is obtained in the two systems. The net surface heat flux and the river discharge are the two most important parameters determining the stratification status of these rivers with little effect from direct wind mixing.