Impacts of Flood Simulation in 3d and Swat Environment of Terengganu River Catchment

Abstract

Flood is natural hazard influenced by climatic and anthropogenic factors. The Terengganu River catchment is located near the South China Sea has been flooding during heavy monsoon season with strong rain-bearing winds to the interior coastal zones of Kuala Terengganu. The ArcSWAT extension of ArcGIS 10.3 and ArcScene 10.3 has been used to design 3D models simulations to predict flood risk event through the stream flow and elevation data derived from ASTER DEM. The Hydrologic Response Units (HRUs) provided the sub-basins parameters which are overlaid with the real-time simulations to determine which sub-basins are affected by flood risk. The flood animation is developed for mitigation and quick decision making for safety and evacuation of flood victims in the Terengganu River catchment. The 3D simulations produce flood risk zones models which illustrate the affected zones by the flood. The 25 sub-basins parameters have distinct characters which influence the stream flow, soils, slopes and land cover. That represent areas affected by flood in Kuala Terengganu. The 25 sub-basins parameters have unique characteristics that influence the river flow, land cover, soil and slopes.