Study of flood risk areas flash flood in the Nam Mun Basin

Abstract

Flooding is a risk in the barren watershed; a flash flood occurs almost every year. The reason for this is that the area is slanted And because of the barren river's flat area, combined with the barren river, the river is not wide enough when it is raining continuously; the amount of water flows quickly, so it cannot be drained in time So there is an issue. The Department of Mineral Resources is currently establishing a watershed monitoring network. However, there are no tools or risk maps to predict the amount of rain. The goal of this study is to investigate flow and movement conditions. and create a map of flood-prone areas. The flash flood The 24-hour cumulative precipitation criteria were 60, 90, 150, and 200 mm/day. In this study, the waste from rainfall was analyzed using the MIKE11 (RR) model, and the flow conditions in the river were calculated using the MIKE11 (RR) model (HD). Flood movement analysis. The flow rate in the Han River takes 54 hours from upstream to the confluence with the Huang River. On August 13, 2001, the highest flow rate was 89.392 m3/sec at station 021101 and the Huang River confluence. 168.738 m3/sec, then simulated the river's water level on different forecast days and forecasted levels based on the precipitation criteria. The results of 7-day forecasting of water in advance using the MIKE11 (DA) model, with the deviation from day 1 to day 3, were the most accurate, with values of 0.207, 0.174, and 0.157 m. The predicted water level was then used to generate a wild water map. flash flooding. The MIKE FLOOD model was used to determine that the area is prone to flash floods areas totaling 6,745, 7,095, 7,884, and 8,026 rai; community areas totaling 207, 301, 414, and 424 rai; and buildings totaling 212, 309, 410, and 423 rai. Maps that will be used for alerts as well as planning or organizing evacuation zones. That is safe and on time, and in the future, areas at risk in project development, the map can be taken into consideration when planning different projects by government agencies.