FLOOD HAZARD MAPPING OF MAINIT-TUBAY RIVER BASIN, MINDANAO, PHILIPPINES USING LIDAR AND NUMERICAL MODELS

摘要

In this paper, we present the methods and results for the flood hazard mapping of Mainit-Tubay River Basin through numerical modelling using LiDAR-derived Digital Terrain Model (DTM), with supplementation of other geospatial datasets that included Synthetic Aperture Radar Digital Elevation Model (DEM) and land-cover map derived from satellite image analysis, among many others. Mainit-Tubay River Basin is one of the river basins covered by the Caraga State University (CSU) Phil-LiDAR 1 Project under the 'Phil-LiDAR 1. Flood Hazard Mapping of the Philippines Using LiDAR' Program supported by the Department of Science and Technology (DOST). Flooding in the river basin has become frequent in recent years. Last 2014, severe flooding occurred in the basin when tropical storms "Lingling" (locally named Agaton) and "Jangmi" (locally named Seniang) brought heavy to torrential rains. We conducted detailed flood hazard mapping of the river basin to assess the impacts brought by these flooding events, and to provide the Local Government Units (LGUs) and the community in the river basin with vital information necessary for flood disaster preparedness and mitigation.