Abstract
This research shows several initial results of our investigation on the erosion degree of main riverchannels (including Gianh, Nhat Le, Thach Han, Huong, Thu Bon, Tra Khuc and Ba rivers) located in the central region of Vietnam from Quang Binh to Phu Yen provinces. The two criteria which were used to assess the dangerous degree from the erosion activity along these rivers include the erosion intensity which is defined by erosion coefficient (Ke, %) and the erosion rate which is defined by erosion width (Be, m) at measuring time. The erosion coefficient is then determined by the ratio between total erosion length at measuring time to the studied length and the annual erosion pace (Ve, m/year) is measured by the width of erosion for each year or each flood event. Basing on the monitoring data and data obtained from field survey, it is possible to assess the current status and propose suggestions associated with the erosion progression of rivers in the Central region of Vietnam, which is expected to be very useful for further studies on geological hazards in this region.