By Ashraf Dewan
Flooding is among the so much devastating traditional dangers on the earth. to be had files recommend that either flood frequency and severity are at the upward push and this is often prone to aggravate within the context of weather switch. As inhabitants, infrastructure and poverty develop swiftly in constructing nations, really in city agglomerations of 10 million humans or extra, floods may cause frequent devastation, fiscal harm and dying. overview of vulnerability and threat from evidently taking place phenomena is for this reason primary that allows you to in attaining city sustainability.
This publication makes use of geospatial suggestions to guage dangers, chance and vulnerability at a metropolitan scale in a data-scarce state. An empirical learn used to be played utilizing distant sensing, GIS and census facts. This examine bargains a brand new method of mapping inhabitants, infrastructures and groups in danger which may tremendously give a contribution to the deeper figuring out of flood mess ups in a speedily increasing megacity. Examples proven during this e-book are from Dhaka Megacity, in spite of the fact that, the ideas and techniques can simply be applied in medium to giant towns of comparable features.
The e-book is key studying for probability researchers, geospatial scientists, catastrophe administration pros, geographers, city planners, and social scientists.
Ashraf M. Dewan is at present a Lecturer within the division of Spatial Sciences at Curtin collage, Western Australia (on depart from his substantial place as affiliate Professor within the Geography & setting division on the college of Dhaka, Bangladesh).
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Additional info for Floods in a Megacity: Geospatial Techniques in Assessing Hazards, Risk and Vulnerability
1989; Shailo 1988). For example, due to its geographic location, Bangladesh must drain significant amounts of transboundary runoff together with its own runoff generated from monsoonal precipitation during July–September (Mirza 2003). Increasing deforestation in the upstream region is also blamed for escalating flood damage (Ali 2007; Haque and Zaman 1993; BWDB 1987), although this is contentious (Hofer and Messerli 2006; Ives 1991; Hamilton 1987). In addition, flat topography (CBJET 1991), synchronization of major rivers’ peak discharge (Brammer 1990a; Islam 2006), riverbed aggradation (Alexander 1989) , the in fl uence of El Niño–Southern Oscillation (Chowdhury 2003a), excessive urbanization and agricultural intensification (Khalequzzaman 1994), and pervasive poverty (Shimi et al.
As seen in Fig. 6, in a natural setting, a significant time delay, called lag time, exists between the rainfall and the peak of the flood. However, with increased impermeable soils through urban development, the lag time dropped sharply, resulting in the rapid rise and fall of floods. This situation is further exacerbated by increased runoff, which quickly blocks storm drains and channels with sediment, waste, and debris—a situation analogous to a bathtub shower when the drain is partly blocked by soap (Keller and Blodgett 2008).
1989), many studies demonstrated that increasing human activities and the gradual encroachment of floodplains are intensifying flood hazards from the national to the local level (Dewan and Yamaguchi 2008; Islam 2006; Rahman et al. 2005; Islam 2001; Haque and Zaman 1993). 4 suggest that flood damage associated with moderate flooding has increased considerably. This can largely be attributed to environmental modifications driven by socioeconomic development. 3 billion, which was higher than the worst flood on record in 1998.