application of remote sensing and gis for flood risk analysis: a case ...

IRJC
International Journal of Social Science & Interdisciplinary Research
Vol.1 Issue 11, November 2012, ISSN 2277 3630
2. A post-processor, which imports the model output and displays it as a GIS layer.
The interface method basically automates the data interchange method. The automation is
accomplished by adding model-specific menus or buttons to the GIS software interface. The
model is executed independently from the GIS; however, the input file is created, at least
partially, from within the GIS. The main difference between the interchange and interface
methods is the automatic creation of a model input file.
U.S. Army Corps of Engineers HEC-GeoRAS software is a good example of the interface
method. Developed as an ArcView GIS extension, GeoRAS allows users to expediently create
input data for their HEC-RAS models. Additional GeoRAS information is provided below.
Integration Method
GIS integration is a combination of a model and a GIS such that the combined program offers
both the GIS and the modeling functions. This method represents the closest relationship
between GIS and floodplain models. Two integration approaches are possible:
1. GIS Based Integration: In this approach, modeling modules are developed in or are called
from a GIS. All the four tasks of creating model input, editing data, running the model,
and displaying output results are available in GIS. There is no need to exit the GIS to edit
the data file or run the model. EPA's BASINS software is a good example of this method.
2. Model Based Integration: In this method GIS modules are developed in or are called from
a computer model. Computation Hydraulics Int.'s (http://www.chi.on.ca/) PCSWMM GIS
software is a good example of this method.
Because development and customization tools within most GIS packages provide relatively
simple programming capability, the first approach provides limited modeling power. Because it
is difficult to program all the GIS functions in a floodplain model, the second approach provides
limited GIS capability. Applications are being developed to connect HEC-HMS and HEC-RAS
models in a single ArcView GIS environment that would allow users to move easily from a
DEM to a floodplain map within a single program (Kopp, 1998).
Conclusion:
Remote sensing data accumulated from past ten years and GIS data base of command area will
give accurate progressive and environmental aspects for the best use for framing policy
decisions. The study area of Raichur district has both Krishna and Tungabhadra river valley with
both posing different set of information‟s for specific policy framework in terms of settlement
pattern and maintenance of post flood social economical and infrastructure fabric.
One of the main aim of study is to take accurate decisions on future settlement pattern in order to
avoid disaster effect in present river valley. Many efforts for disaster management by providing
housing solution in upland locations have failed to bring a change in the social fabric because of
locational disadvantage.
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