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Báo cáo "A nalyse the fluctuation and water level trend in Saigon- Dong Nai river system "

Beside the effect of gravitational forces, the water level in Sai Gon-Dong Nai River System is also affected by non gravitational forces such a wind, air pressure, rainfall and sea level rise. The purpose of this paper is to simulate the water level of these river based on the tidal and non-tidal constituents, from that assess the role of non-tidal constituents to water variation. In this study, the none-tidal data used includes the wind field at surface, sea level pressure and the rainfall in Sai Gon- Dong Nai Basin. With the analyzed data series from 1980 to 2007, the results. | VNU Journal of Sdence Earth Sciences 25 2009 223-231 A nalyse the fluctuation and water level trend in Saigon - Dong Nai river system Luong Van Viet Pham Dang Manh Hong Luan Le Anh Tuan Sub-Institute of Hydro- Meteorology and Environment of South Vietnam Received 17 November 2009 Abstract. Beside the effect of gravitational forces the water level in Sai Gon-Dong Nai River System is also affected by non gravitational forces such a wind air pressure rainfall and sea level rise. The purpose of this paper is to simulate the water level of these river based on the tidal and non-tidal constituents from that assess the role of non-tidal constituents to water variation. In this study the none-tidal data used includes the wind field at surface sea level pressure and the rainfall in Sai Gon - Dong Nai Basin. With the analyzed data series from 1980 to 2007 the results show that after supplementing the non-tidal elements the water level simulation quality is increased the wind and rainfall have an important role to water level. The results also show that near river mouths the water level raised 13 cm from 1980-2007 due to the global climate change. Keywords tidal harmonic analysis non-tidal constituents sea level rise 1. Generalization The Dong Nai -- Sai Gon river system whose watershed area is approximately 45 000 km2 is the second largest river system in the Southern provinces. These river system comprises of main rivers including La Nga Be Dong Nat Sai Gon Nha Be and rivers ending up in Ganh Rai bay. It is the watershed covering main economic zone in the South which has many activities related to water resources the downstream of the area is low and vulnerable to sea level rise effects. Therefore short - term and long - term forecast of water level in this area is a significant demand. _ Corresponding author. Tel. 84-4-38275971 E-mail lgviet@yahoo.com Tide regime of river system in the researched area is semi-diurnal type with tide amplitude .