SUMMARY

Characteristics of collapse in the Cầu River bank in Bắc Cạn Province, East Bắc Bộ

Đỗ Minh Đức

The Cầu River banks suffer intensive collapse, especially during rainy season. The collapse always happens in meandering segments of the river. There is a total of 170 meandering segments in the study area, among them, 59 ones are constituted by alluvial and weathered soil having strong collapse level. According to the calculation model of Hickins and Nanson [1], the estimated collapse rate ranges from 1 to over 16 m/y. The most intensive collapse segments are Khau Chu, Sáu Hai and Khuổi Hoa. The most suitable counter measures versus erosion consist of improvement of ability of flood and collapse warning, reinforcement of river banks by stone embankments.

Ngày nhận bài: 10/7/2009

Người biên tập: TS. Hoàng Anh Khiển

(Cục Địa chất và Khoáng sản Việt Nam)