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Báo cáo " Numerical simulation of sediment transport and morphology changes at the Bach Dang estuary "

Morphology change at tidal influent estuary is controlled by the net sediment transport rate of river and tidal transport, and variations in features (bathymetry, structures, etc.) where scour and shoaling take place. To examine river and tidal exchange sediment transport in a systematic way, we investigated sediment transportation at the Bach Dang estuary with a coupled tide, wave and sediment transport-morphology change numerical modeling system. Five simulations consisting of | VNU Journal of Science Earth Sciences 26 2010 90-97 Numerical simulation of sediment transport and morphology changes at the Bach Dang estuary Nguyen Minh Huan1 Nguyen Quoc Trinh2 Pham Tien Dat3 1 Faculty of Hydro-Meteorology and Oceanography Hanoi University of Science VNU 334 Nguyen Trai Hanoi Vietnam 2National Centre for Hydro-Meteorological Forecasting MONRE 3Vietnam Sea and Island General Department MONRE Received 05 September 2010 received in revised form 24 September 2010 Abstract. Morphology change at tidal influent estuary is controlled by the net sediment transport rate of river and tidal transport and variations in features bathymetry structures etc. where scour and shoaling take place. To examine river and tidal exchange sediment transport in a systematic way we investigated sediment transportation at the Bach Dang estuary with a coupled tide wave and sediment transport-morphology change numerical modeling system. Five simulations consisting of tide forcing wave forcing fair-weather and storm and combined tide and wave forcing were conducted. 1. Introduction Morphology change at tidal influent estuary is controlled by the net sediment transport rate of river and tidal transport variations in features bathymetry structures etc. where local scour and shoaling take place. Common morphologic responses to wave and tide forcing are deposition and migration of the inlet channel thalweg development of shoals beach erosion in the area. Bach Dang estuary in Iai Phong province is an example where all of these responses have been observed. Therefore we investigate sedimentation transport at the BachDang estuary with a coupled tide wave Corresponding author. Tel. 84-4-35586898. E-mail nmhuan61@gmail.com and sediment transport-morphology change numerical modeling system. Transport paths and morphology change were calculated for combined tide and wave forcing with different return period by application of coupled circulation wave and sediment transport-morphology .