Delineation of smallscale landforms relative to f

Authors: Loan Thi Kim Ho Yasushi Yamaguchi Masatomo Umitsu

Publish Date: 2013/06/07

Volume: 69, Issue: 1, Pages: 905-917

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Abstract

Flood susceptibility mapping using geomorphologic approaches is effective for delineating flood extent and various degrees of potential floodaffected areas This approach is useful where the channel system and floodplain morphology change dynamically and in regions where detailed digital elevation models are not available The first important step in flood zonation using this approach is detailed geomorphologic mapping also called landform classification This study aims to describe landform classification using the rulebased method of Ho et al Int J Geoinform 8427–38 2012 adapted to local characteristics in the western plain of the Red River delta northern Vietnam The original classification scheme is generally based on the moist condition classification local landsurface parameters and relative position indices derived from multitemporal Landsat data and a shuttle radar topographic mission digital elevation model SRTM DEM This study uses average elevations and the standard deviation of elevations as local landsurface parameters rather than local relief which was used in the study by Ho et al Int J Geoinform 8427–38 2012 Multitemporal land cover classification was performed using an integrated method to effectively correct the SRTM DEM The overall classification is consistent with manual mapping by visual comparison The quantitative comparison between landform units and past floodaffected areas demonstrates a precise boundary delineation of landform objects using this method The high agreement between the boundaries of landform units and floodinundated areas suggests the applicability of this method taking advantage of readily available remotely sensed datasets in alluvial floodplains

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