Scenario study for Flood Hazard Assessment in the lower Bicol Floodplain Philippine using A 2D Flood model

Abstract

In the frameworks of the ITC Projects (SLARIM) Strengthening Local Authorities in Risk Management, a case study was carried out on hazard assessment on Lower Bicol floodplain. The floodplain is located in four provinces in the Philippines. It is an area frequented by Typhoons accompanied with floods. This study was carried out in collaboration with Naga City Municipality, the Philippines, In order to assist the Local authorities in the flood management. 2D flood model Delft-FLS was used to reconstruct one of the flood events caused by the Typhoon Yonning. The Model parameters were the DEM of the floodplain, the DEM of the riverbed, the floodplain and riverbed roughness, and the artificial structures. The model hydrological boundaries were the discharges at the upstream and the tidal fluctuations at the Bay. The model results were compared with water depth information, obtained from the local people, during …