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Water 2014, 6(5), 1280-1299; doi:10.3390/w6051280
Article

Simplified Flood Inundation Mapping Based On Flood Elevation-Discharge Rating Curves Using Satellite Images in Gauged Watersheds

1
,
2
,
3
,
4
 and
2,*
1 Institute of Environmental Research, Kangwon National University, Chuncheon 200-701, Korea 2 School of Urban and Civil Engineering, Hongik University, Seoul 121-791, Korea 3 Department of Civil and Environmental Engineering, Incheon National University, Incheon 406-772, Korea 4 Department of Civil Engineering, Shingu University, Sungnam 462-743, Korea
* Author to whom correspondence should be addressed.
Received: 25 February 2014 / Revised: 23 April 2014 / Accepted: 28 April 2014 / Published: 9 May 2014
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Abstract

This study suggests an approach to obtain flood extent boundaries using spatial analysis based on Landsat-5 Thematic Mapper imageries and the digital elevation model. The suggested approach firstly extracts the flood inundation areas using the ISODATA image-processing algorithm from four Landsat 5TM imageries. Then, the ground elevations at the intersections of the extracted flood extent boundaries and the specified river cross sections are read from the digital elevation to estimate the elevation-discharge relationship. Lastly, the flood extent is generated based on the estimated elevation-discharge relationship. The methodology was tested over two river reaches in Indiana, United States. The estimated elevation-discharge relationship showed a good match with the correlation coefficients varying between 0.82 and 0.99. In addition, self-validation was also performed for the estimated spatial extent of the flood by comparing it to the waterbody extracted from the Landsat images used to develop the elevation-discharge relationship. The result indicated that the match between the estimated and the extracted flood extents was better with higher flood magnitude. We expect that the suggested methodology will help under-developed and developing countries to obtain flood maps, which have difficulties getting flood maps through traditional approaches based on computer modeling.
Keywords: Landsat; flood; ISODATA; digital elevation model; elevation-discharge relationship Landsat; flood; ISODATA; digital elevation model; elevation-discharge relationship
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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Jung, Y.; Kim, D.; Kim, D.; Kim, M.; Lee, S.O. Simplified Flood Inundation Mapping Based On Flood Elevation-Discharge Rating Curves Using Satellite Images in Gauged Watersheds. Water 2014, 6, 1280-1299.

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