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Journal of Environmental Hydrology
ISSN 1058-3912 |
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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 ABSTRACT 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. CONTACT: Duc H. Nguyen Department of River Engineering and Natural Disaster Management Hanoi Water Resources University No. 75 Tay Son street, Dong Da district Hanoi, Vietnam E-mail: ducnh@wru.edu.vn |
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