Đỗ Quang Thiên


Abstract: In this report, we wish to show some initial achievements of our researches about the motive of erosion process of rivers in the mid-central part of Vietnam from Quang Binh to Phu Yen (They include Gianh river, Nhat Le river, Thach Han river, Huong river, Thu Bon river, Tra Khuc river, Ba river). In order to assess danger's degree generated from the rivers themself, we apply two criteria including the intensity and the rate of erosion. Among which, erosion intensity is defined by erosion coefficient (Ke - %) and erosion width (Be - m) at measuring time. With the coefficient is the ration between total erosion lenght at measuring time and the length of the studied segment. The annual pace of erosion Ve (m/year) is measured by the width of erosion each year or each flood. From this motive scale and results of surveys and monitorings in the field, it is possible to assess and propose the basic comments associated with the eroion motive of rivers in the mid-central part of Vietnam. This is expected will be very useful for following studyings of geological hazards.


(1) Do Quang Thien, Nguyen Thanh, Trinh Thi Giao Chau, Hoang Ngo Tu Do. Effects of torrential rainfall on the Gianh river bank erosion due to global warming and climate change. Proceedings of the international workshop on geo-engineering for responding to climate change and sustainable development of infrastructure, page 54 - 60, 2012.

(2) Do Quang Thien, Nguyen Thanh,Tran Thanh Nhan. The implicit danger of system of Vu Gia - Thu Bon stepping hydropower works for accumulation action at lower section. Proceedings of the international conference on green technology and sustainable development, page 25 - 34, 2012.

(3) Do Quang Thien, Tran Thanh Nhan. Assessment of siltation and erosion processes along Vu Gia-Thu Bon river system according to the analysis of sattelite images and field surveys. Climate change and the sustainability. Proceedings of the 2nd international symposium, page 203 – 214, 2008.

(4) Do Quang Thien, Nguyen Thanh, Do Minh Toan. Using outlooks on assessment of sensitive degree of geological environment for studying deposition and erosion along river system (apply to the downstream of Thu Bon river, from Giao thuy to Cua Dai). Proceedings of the international Symposium, Ha Noi Geoengineering, New Challenges in Geosystem Engineering and Exploration, page 240 - 248, 2007.

(5) Do Quang Thien. Research on the erosion - accumulation processes of rivers and propositon suitable for preventive solutions in mid-central part of Vietnam. Report of Ministry level research project code: B2011-DHH02, Hue University of Sciences, Vietnam, 2014.

(6) Do Quang Thien. Resesrch, prediction of changing in riverbank at lower section after using the stepping hydropower works. Report of Ministry level research project code: B2009-DHH01-76, Hue University of Sciences, Vietnam, 2011.

(7) Do Quang Thien. Resesrch, prediction and proposition solutions for the mitigation of damages as an effect of erosion - accumulation disasters at middle - lower section of Gianh - Nhat Le River to serve the sustainable development for the research area. Report of Province level research project, Quang Binh People’s Committee, Vietnam, 2013.