Document Detail


Regional scale flood modeling using NEXRAD rainfall, GIS, and HEC-HMS/RAS: a case study for the San Antonio River Basin Summer 2002 storm event.
MedLine Citation:
PMID:  15854726     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
This paper develops a framework for regional scale flood modeling that integrates NEXRAD Level III rainfall, GIS, and a hydrological model (HEC-HMS/RAS). The San Antonio River Basin (about 4000 square miles, 10,000 km2) in Central Texas, USA, is the domain of the study because it is a region subject to frequent occurrences of severe flash flooding. A major flood in the summer of 2002 is chosen as a case to examine the modeling framework. The model consists of a rainfall-runoff model (HEC-HMS) that converts precipitation excess to overland flow and channel runoff, as well as a hydraulic model (HEC-RAS) that models unsteady state flow through the river channel network based on the HEC-HMS-derived hydrographs. HEC-HMS is run on a 4 x 4 km grid in the domain, a resolution consistent with the resolution of NEXRAD rainfall taken from the local river authority. Watershed parameters are calibrated manually to produce a good simulation of discharge at 12 subbasins. With the calibrated discharge, HEC-RAS is capable of producing floodplain polygons that are comparable to the satellite imagery. The modeling framework presented in this study incorporates a portion of the recently developed GIS tool named Map to Map that has been created on a local scale and extends it to a regional scale. The results of this research will benefit future modeling efforts by providing a tool for hydrological forecasts of flooding on a regional scale. While designed for the San Antonio River Basin, this regional scale model may be used as a prototype for model applications in other areas of the country.
Authors:
M R Knebl; Z-L Yang; K Hutchison; D R Maidment
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't; Research Support, U.S. Gov't, Non-P.H.S.    
Journal Detail:
Title:  Journal of environmental management     Volume:  75     ISSN:  0301-4797     ISO Abbreviation:  J. Environ. Manage.     Publication Date:  2005 Jun 
Date Detail:
Created Date:  2005-04-27     Completed Date:  2005-08-11     Revised Date:  2008-11-21    
Medline Journal Info:
Nlm Unique ID:  0401664     Medline TA:  J Environ Manage     Country:  England    
Other Details:
Languages:  eng     Pagination:  325-36     Citation Subset:  IM    
Affiliation:
Department of Geological Sciences, University of Texas at Austin, 1 University Station C-1100, Austin, TX 78712-0254, USA.
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MeSH Terms
Descriptor/Qualifier:
Computer Simulation
Databases, Factual
Disasters*
Geographic Information Systems
Geography
Models, Theoretical*
Radar
Rain*
Rivers*
Texas

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine


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