tailieunhanh - Evaluation estuarine and coastal bathymetry changes of Cua Viet using Digital Elevation Model

Cua Viet is the Thach Han river’s mouth. It is quite big estuary that is located in the central coastal province of Quang Tri. In which, Cua Viet port plays an important role for water transport and commerce of the province. In recent years, accretion and erosion have occurred increasingly in term of scale and intensity. In addition, estuarine access channels suffer severely from sedimentation. | Evaluation estuarine and coastal bathymetry changes of Cua Viet using Digital Elevation Model Dao Dinh Cham1 Nguyen Thai Son2 Nguyen Van Cu3 Abstract Cua Viet is the Thach Han river s mouth. It is quite big estuary that is located in the central coastal province of Quang Tri. In which Cua Viet port plays an important role for water transport and commerce of the province. In recent years accretion and erosion have occurred increasingly in term of scale and intensity. In addition estuarine access channels suffer severely from sedimentation. Until now there is no effective measure to train this estuary and Cua Viet morphological changes effect to navigation flood control and other economic activities. In the frame work of this paper bathymetry changes of Cua Viet estuary especially access channels to Cua Viet port are deeply evaluated by setting up digital elevation model DEM based on in situ measured data in recent times. Key words estuaries bathymetry bottom changes DEM Cua Viet 1. Problem definition The sedimentation - erosion process of coastal zones and sedimentation at estuaries are considered as a substantial type of disaster in Vietnam which occurred in all parts of the country with complex variation causing large damage to human lives and property with long-term economic and environmental consequences. A large amount of expenditure is spent by the Government to recover prevent and rescue as well as dredging maintenance and prevention of sedimentation and erosion in estuarine ports. Cua Viet is an estuary of Thach Han river and is also a considerably large estuary within Quang Tri province also the place where frequent natural disasters happen such as typhoons floods coastal erosion estuarine sedimentation etc. Specifically the sedimentation - erosion process are happening with increasing trend both in scale and magnitude. Sedimentation of the access channel within Cua Viet estuary happens quite seriously without any effective engineering measures yet. To help