Open AccessCross Section Intervals of Flood Intervals of Flood Inundation Mapping at Ungauged Area
Author(s) -
S.Z. Hashim,
Ernieza Suhana Mokhtar,
Ahmad Ikhwan Abdul Halim,
Wan Mohd Naim Wan Mohd,
Nor Aizam Adnan,
Biswajeet Pradhan
Publication year - 2021
Publication title -
iop conference series. earth and environmental science
Language(s) - English
Resource type - Journals
eISSN - 1755-1307
pISSN - 1755-1315
DOI - 10.1088/1755-1315/620/1/012003
Subject(s) - digital elevation model , flood myth , shuttle radar topography mission , interferometric synthetic aperture radar , elevation (ballistics) , remote sensing , mean squared error , context (archaeology) , 100 year flood , synthetic aperture radar , radar , geology , hydrology (agriculture) , environmental science , geography , statistics , computer science , mathematics , geotechnical engineering , paleontology , telecommunications , geometry , archaeology
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.