Delineating flood risk areas in greater dhaka of bangladesh using geoinformatics

Ashraf M. Dewan, Humayun Kabir, M. Monirul Islam, T. Kumamoto, M. Nishigaki

Research output: Contribution to journalArticle

11 Citations (Scopus)

Abstract

This paper illustrates the development of flood hazard and risk maps in Greater Dhaka of Bangladesh using geoinformatics. Multi-temporal RADARSAT SAR and GIS data were employed to delineate flood hazard and risk areas for the 1998 historical flood. Floodaffected frequency and flood depth were estimated from multi-date SAR data and considered as hydrologic parameters for the evaluation of flood hazard. Using land-cover, gemorphic units and elevation data as thematic components, flood hazard maps were created by considering the interactive effect of flood frequency and flood water depth concurrently. Analysis revealed that a major portion of Greater Dhaka was exposed to high to very high hazard zones while a smaller portion (2.72%) was free from the potential flood hazard. Flood risk map according to administrative division showed that 75.35% of Greater Dhaka was within medium to very high risk areas of which 53.39% of areas are believed to be fully urbanized by the year 2010.

Original languageEnglish
Pages (from-to)190-201
Number of pages12
JournalGeorisk
Volume1
Issue number4
DOIs
Publication statusPublished - Jan 1 2007

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Keywords

  • Flood
  • Flood hazard map
  • Flood risk map
  • GIS
  • Greater Dhaka
  • SAR

ASJC Scopus subject areas

  • Civil and Structural Engineering
  • Building and Construction
  • Safety, Risk, Reliability and Quality
  • Geotechnical Engineering and Engineering Geology
  • Geology

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