TAILIEUCHUNG - Storm surge predictions for Vietnam coast by Delft3D model using results from RAMS model

Storm surges are dangerous phenomena to the Vietnam coast, so they are taken in account by number of researchers. Rapid and accurate prediction of storm surges makes contribution in protection and mitigation of natural damages in coastal areas. Storm surges are considered as a complicated processes under action of air pressure, wind field, tide etc. and they may be well predicted using mathematical models. | Storm surge predictions for Vietnam coast by Delft3D model using results from RAMS model Nguyen Tho Sao1 Abstracts Storm surges are dangerous phenomena to the Vietnam coast so they are taken in account by number of researchers. Rapid and accurate prediction of storm surges makes contribution in protection and mitigation of natural damages in coastal areas. Storm surges are considered as a complicated processes under action of air pressure wind field tide etc. and they may be well predicted using mathematical models. It is the basic branch of the state scientific project named KHCN-08-05 Technological building for associated predictions of typhoons storm surges and waves in Vietnam using numerical models for 3-days forecast . This paper describes the preliminary results in storm surge prediction by Delft3D-FLOW model using the meteorological outputs of RAMS model. Key words storm surge tide South China Sea numerical method RAMS Delft3D-FLOW prediction. 1. Introduction Wind-setup is the rise of sea level relatively to the normal still water level in great lakes or seas when wind is blowing to the shore. Wind-setdown is the falling of sea level when wind is blowing from the shore. In the sea affected by tides wind setup or storm surge is the rise of water level above the tidal level due to storms. Tide topography earth s rotation wind speed radius of maximum wind storm movement velocity atmospherical pressure precipitation river flows influence to wind-setup setdown but the most important factors are air pressure and wind patterns. Wind-setup setdown is of short term period but the propagation is the long wave. When wind speed exceeds 74 mph during storms hurricanes the rise of water level is very significant and it is called storm surge. This is the short term response of water body to the pressure and wind fields over the sea 2 . If the storm surge is coincident with the high water during spring tide it gives rise of strong damages on humanity and properties in the

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