@inproceedings{TrinhNguyenMolkenthin, author = {Trinh, Manh Xuan and Nguyen, Mai Dang and Molkenthin, Frank}, title = {Flood risk assessment in the Tra Bong river catchment, Vietnam}, series = {International Symposium on Lowland Technology (ISLT 2018), Hanoi, Vietnam}, booktitle = {International Symposium on Lowland Technology (ISLT 2018), Hanoi, Vietnam}, publisher = {Construction Publishing House}, address = {Hanoi}, isbn = {978-604-82-2483-7}, pages = {8}, abstract = {Extreme flood events often cause tremendous damage and enormous risks to our life and nature. Flooding is one of the most costly kinds of natural disasters in Vietnam. Tra Bong is a river catchment located in Quang Ngai province, Vietnam. Due to the effect of typhoons originated from the East Sea, many extreme floods occur in this river annually. Therefore, considering the impacts of flooding and flood risk assessment in this river plays an important role in mitigating and adapting to flood risk. In this paper, a hydrological model (MIKE NAM) and some hydro-dynamic models such as the MIKE 11 HD, MIKE 21 FM and MIKE Flood models were applied as the effective tools to simulate flooding and inundation in the downstream area of the catchment. Two flood risk maps for 2009 and 100 year return period were created based on the intersection of hazard and vulnerability maps which were obtained from flood maps, land-use and population density. Accordingly, more than 80\% of total flooded area is at high and very high risk. Almost 35 km2 of the flooded area were under high and very high risk in the year 2009, while, approximately 45.5 km2 would be under high and very high risk in the design flood event of 100 year return period.}, language = {en} }