Abstract
To perform a computation of water environments in lake with accurately evaluating discharge and pollutant loads in influent rivers, we develop a coupled river-lake model in which a river-flow simulation is employed with a new simplified horizontal coordinate system, named horizontal sigma coordinates. In the numerical simulation for river flow and sediment transports with the coupled river-lake model, the computational results for SS fluctuations in the river and lake give acceptable agreements with those of the observed data, demonstrating the fundamental validity of the present model. It is also noteworthy that the treatment of the erosion rate of sediments has a key role on an accurate computation of sediment transports in an urban river estuary.
