NUMERICAL ANALYSIS OF THE BREAK OF DENSITY STRATUM IN A SHALLOW BRACKISH LAKE

Abstract

In a brackish lake the occurrence of the density stratum by the vertical distribution of water temperature and salinity exerts an important influence on the water quality. Therefore. in a lake where there might be a occurring of strong density stratum. the mathematical model that predicts the break of density stratum should be developed and the characteristics of the break of density stratum must be examined with the model.
In this paper, the 1-D mathematical model that predicts the hourly change of water temperature and salinity distribution in the shallow brackish lake is developed. And using the model. the influence of water temperature and salinity distribution on the characteristics of the break of density stratum is investigated analytically. Furthermore. the influence of the shape of the lake is evaluated. Finally. the frequency of the break of density stratum is discussed from the results of numerical simulations under various stratum conditions with actual wind data in the past.