Journal of Environmental Hydrology
Electronic Journal of the International Association for Environmental Hydrology
JEH Volume 20 (2012), Paper 9 Posted July 3, 2012
VARIATION IN FRESH-WATER DISCHARGE DUE TO GEOMETRIC INFLUENCES IN THE RED RIVER ESTUARY, VIETNAM
Duc H. Nguyen1
2Tokyo Metropolitan University, Tokyo, Japan
Fresh-water discharge is one of the most critical factors used to evaluate estuarine environments. Most previous studies have considered this discharge within the context of a tidally-averaged quantity in space and time. In this paper, a one-dimensional salt-intrusion model is proposed to predict fresh-water discharge distribution in the geometrically-complex Red River estuary. Because of changes in shape following tidal variation, the estuary branch is divided into multi-reach segments restricted by longitudinal geometric distribution in a few tidal phases. In addition, we estimated the estuary’s fresh-water discharge by prescribing several geometric parameters that vary exponentially under spring and neap tide conditions. The magnitude of fresh-water discharge obtained from the analytical solution is dependent on tidal forcing and geometric parameters, and its spatial distribution is particularly sensitive to these values at high water levels.
Reference: Nguyen, D.H., M. Umeyama, and T. Shintani. 2012. Variation in fresh-water discharge due to geometric influences in the Red River Estuary, Vietnam. Journal of Environmental Hydrology, Vol. 20, Paper 9.
Duc H. Nguyen
Department of River Engineering and Natural Disaster Management
Hanoi Water Resources University
No. 75 Tay Son street, Dong Da district
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