Impacts of Flood Simulation in 3D and SWAT Environment of Terengganu River Catchment

Flood is a 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 strongrain-bearing  winds  to  the  interior  coastal  zones  of  Kuala  Terengganu.  The  ArcSWAT2012extension  of  ArcGIS10.3  and  ArcScene10.3  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.  One  of  the  effective  ways  offlood  monitoring  is  to  see  it  physically occurring  or  happening  in  real-time.  The  solution  is  to  set  the  model  at  the  simulation  in  the  3D environment. The Terengganu River catchment was successfully delineated and simulated using the sub-basins to identify zones that are affected by the flood risk. The impacts of flood risk usually take place during the monsoon period, especially in Peninsular Malaysia. The Terengganu catchment is liable to flooding  during the period of monsoon. The average rainfall during flash  flood reaches to 3000mm of rain, with more than 24 hours of a continuous heavy rain shower. The flood event mostly affects peninsular Malaysia from Decembers to January.

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