Prediction of Sediment Accumulation Tendency During Heavy Rainfall in Khao Makok Area Using the HEC-RAS Model
Keywords:
Sediment Transport, HEC-RAS, Digital Elevation Model, Runoff, Water ManagementAbstract
The construction of buildings and structures in water flow areas caused sediment accumulation that obstructed waterways, leading to flash flooding problems in downstream areas during heavy rainfall exceeding normal levels. This research used the HEC-RAS hydraulic model to simulate water flow conditions during rainfall intensity of 31.4 millimeters per hour for 3 hours, as this rainfall intensity can cause flooding based on 20-year recorded rainfall statistics in the Khao Makok area, which was the location of the Navaminda Kasatriyadhiraj Royal Thai Air Force Academy. The water intake points from Khao Makok are spaced 250-300 meters apart. The simulation results revealed sediment accumulation from surrounding areas and flood risk. The model showed that water flowing through natural channels had higher velocity than surrounding areas, flowing into the Naval Academy area at approximately 1 m/s while carrying sediment along the natural waterway. In the western drainage area, sediment movement and accumulation occurred, while in the southern area, sediment accumulated in nearby areas before reaching the drainage system. This simulation study aimed to lead to the design of efficient drainage systems and sediment management in the future. The goal was to reduce risks from flooding, erosion, and soil accumulation, as well as to develop infrastructure for stable and sustainable water intake and drainage planning.
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