Abstract
Abstract. Conventional method of identifying areas to be inundated for issuing flood alert require inputs like discharge data, fine resolution digital elevation model (DEM), software for modelling and technically trained manpower to interpret the results meaningfully. Due to poor availability of these inputs, including good network of historical hydrological observations and limitation of time, quick flood early warning becomes a difficult task. Presently, based on the daily river water level and forecasted water level for major river systems in India, flood alerts are provided which are non-spatial in nature and does not help in understanding the inundation (spatial dimension) which may be caused at various water levels. In the present paper a concept for developing a series of flood-inundation map libraries two approaches are adopted one by correlating inundation extent derived from historical satellite data analysis with the corresponding water level recorded by the gauge station and the other simulation of inundation using digital elevation model (DEM's) is demonstrated for a part of Godavari Basin. The approach explained can be one of quick and cost-effective method for building a library of flood inundation extents, which can be utilized during flood disaster for alerting population and taking the relief and rescue operations. This layer can be visualized from a spatial dimension together with other spatial information like administrative boundaries, transport network, land use and land cover, digital elevation data and satellite images for better understanding and visualization of areas to be inundated spatially on free web based earth visualization portals like ISRO's Bhuvan portal (http://bhuvan.nrsc.gov.in). This can help decision makers in taking quick appropriate measures for warning, planning relief and rescue operations for the population to get affected under that river stage.
Highlights
One of the most effective ways to enhance flood preparedness and response is to model flood events
In the present study two quick and cost-effective approaches for developing a series of readily available flood-inundation map libraries is demonstrated based on the analysis of historical satellite images, river water level and digital elevation model (DEM) which can be utilized during flood disaster for alerting population and taking the relief and rescue operations
In the present study three historical satellite images acquired during floods, where water level data was available were analysed for extraction of flood inundation
Summary
One of the most effective ways to enhance flood preparedness and response is to model flood events. Most of the flood inundation models are based on the advanced algorithmic and multiple data requirements that area some-times difficult to apply in developing countries (Hagen et al, 2010). For a more comprehensive approach for disaster response Bales and Wagner (2009) have suggested to develop a library of inundation extents for a range of river stages that covers an expected range of events from low flow to aboverecord levels. In the present study two quick and cost-effective approaches for developing a series of readily available flood-inundation map libraries is demonstrated based on the analysis of historical satellite images, river water level and digital elevation model (DEM) which can be utilized during flood disaster for alerting population and taking the relief and rescue operations. Developing a library of modelled flood extents for communities over a range of potential flood levels can offer a resource that is accessed and, when combined with addition geospatial data, can provide valuable information that can be used to guide critical, time dependent decision making
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