Sinha, P C; Rao, Y R; Dube, S K; Murthy, C R; Chatterjeec, A K
turbulence closure; estuary; numerical model; currents; salinity; india coast
This paper has two purposes. The first is to study the circulation and salinity in Hooghly Estuary, along the east coast of
India and the second is to compare the performance of two turbulence closure schemes by modelling it. A breadth
averaged numerical model using a sigma co-ordinate system in the vertical is briefly described. Vertical diVusion of momentum and salt are parameterized by a simple first-order turbulent closure or by a one equation model for turbulent kinetic energy (TKE) which uses a specified mixing length. The results are compared with the available neap and spring tide observations along the estuary for both low and high discharge periods.The computed elevations and currents are in reasonable agreement with the observations showing no major diferences
in vertical current profiles by both the turbulent schemes. However, there is a slight under-prediction of bottom currents.
The salinity profiles predicted by TKE model show better matching with observations. Statistical tests are also conducted to study the comparative performance of the turbulent closure schemes. The maintenance of two layer structure in residual currents and salt variability are also studied by using the model.