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Delineation of flood-prone areas using modified topographic index for a river basin

Nagesh Kumar, D and Shastry, AR and Srinivasa Raju, K (2020) Delineation of flood-prone areas using modified topographic index for a river basin. In: H2Open Journal, 3 (1). pp. 58-68.

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Official URL: https://doi.org/10.2166/h2oj.2020.021


The modified topographic index (TIm) based on digital elevation models (DEMs) was employed to delineate flood-prone areas in Mahanadi basin, India. TIm and flood inundation maps were compared to obtain the threshold (t) beyond which the area is assumed to be inundated by flood and the exponent of the TIm. Scale dependence was also investigated to evaluate the sensitiveness of spatial resolution of the DEMs. DEMs of five resolutions, namely, ASTER global, SRTM, GMTED2010 (30 arc-seconds), GMTED 2010 (15 arc-seconds), and GMTED 2010 (7.5 arc-seconds), were used and ASTER global was preferred due to its low error compared to the remainder. Flood frequency analysis was conducted to obtain the relationship between flood-prone areas and flood magnitude. It was observed that (i) the exponent in the TIm showed little variation, (ii) t is reduced with reducing spatial resolution of the DEM, and (iii) error is also reduced as the DEMs� resolution is reduced. © 2020 The Authors.

Item Type: Journal Article
Publication: H2Open Journal
Publisher: IWA Publishing
Additional Information: The copyright for this article belongs to IWA Publishing
Department/Centre: Division of Mechanical Sciences > Civil Engineering
Date Deposited: 22 Mar 2021 11:51
Last Modified: 22 Mar 2021 11:51
URI: http://eprints.iisc.ac.in/id/eprint/68560

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