Nagesh Kumar, D. ; Shastry, Apoorva R. ; Srinivasa Raju, K. (2020) Delineation of flood-prone areas using modified topographic index for a river basin H2Open Journal, 3 (1). pp. 58-68. ISSN 2616-6518
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Official URL: http://doi.org/10.2166/h2oj.2020.021
Related URL: http://dx.doi.org/10.2166/h2oj.2020.021
Abstract
The modified topographic index based on digital elevation models (DEMs) was employed to delineate flood-prone areas in Mahanadi basin, India. and flood inundation maps were compared to obtain the threshold beyond which the area is assumed to be inundated by flood and the exponent of the . 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 showed little variation, (ii) is reduced with reducing spatial resolution of the DEM, and (iii) error is also reduced as the DEMs' resolution is reduced.
Item Type: | Article |
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Source: | Copyright of this article belongs to IWA Publishing. |
Keywords: | Digital elevation models; Flood-prone area; Frequency analysis; Mahanadi basin; Modified topographic index |
ID Code: | 125583 |
Deposited On: | 17 Oct 2022 06:37 |
Last Modified: | 20 Oct 2022 10:36 |
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