Cross section intervals of flood intervals of flood inundation mapping at ungauged area

• Published in: IOP Conference Series: Earth and Environmental Science
• Main Author: Hashim S.; Mokhtar E.S.; Halim A.I.A.; Wan Mohd W.M.N.; Adnan N.A.; Pradhan B.
• Format: Conference paper
• Language: English
• Published: IOP Publishing Ltd 2021
• Online Access: https://www.scopus.com/inward/record.uri?eid=2-s2.0-85100414206&doi=10.1088%2f1755-1315%2f620%2f1%2f012003&partnerID=40&md5=a8cf360cdc793e234309a55445a60ce6

Digital Elevation Models (DEMs) are essential to present the continuous surface elevation and is used for flood mapping. The use of different cross-section intervals obtained from the various spatial resolution of DEMs will affect the flood depth and inundation area estimation. Therefore, a comparison study is carried out to investigate the effect of cross-section intervals on flood expansion and flood depth which is simulated using one dimensional (1D) HEC-RAS model at Padang Terap River, Malaysia. Two digital elevation models (DEMs) imageries, Interferometry Synthetic Aperture Radar (IFSAR) and Shuttle Radar Topography Mission (SRTM) are used in this study. The result was evaluated using likelihood measures (F-statistics, root mean square error (RMSE), and mean absolute error). The findings reveal the IFSAR DEM with cross-section interval 50 m has higher F-statistics of 70% on flood inundation estimation. By proposing the methodology, flood mapping can be provided accurately by considering the error that exist in the Geographical Information System (GIS) spatial context. © 2021 Institute of Physics Publishing. All rights reserved.