Floodplain Visualization using TINs

dc.creatorAzagra, Esteban
dc.creatorOlivera, Francisco
dc.date.accessioned2021-09-14T20:17:29Z
dc.date.available2021-09-14T20:17:29Z
dc.date.issued1999-12
dc.description.abstractFor more than thirty years, computer models have been used as essential tools for floodplain determination. Although the combined use of hydrologic and hydraulic models has significantly increased the ability to predict flooding events, the amount of fieldwork required to create and calibrate a model is still considerable. This document presents a methodology that uses aerial mapping as a basis for creating floodplain maps when using the HEC River Analysis System (HEC-RAS) hydraulic model for floodplain analyses. The approach is based on the use of triangular irregular networks (TINs) within a geographic information system (GIS) environment. This methodology was applied to the Waller Creek watershed in Austin, Texas, and involved three phases. First, flow data required by HEC-RAS were determined using the GIS-based application CRWR-PrePro and the hydrologic model HEC Hydrologic Modeling System (HEC-HMS). During the second phase, tools were developed for embedding structures, such as buildings, into the TIN. Finally, the ArcView GIS extension AVRas was used to extract the information contained in the TIN, export it into HEC-RAS, read the results of the hydraulic model and represent the flooded areas. Two and three dimensional animations were developed to show the visualization capabilities offered by GIS. Both, the comparison of the geometric data extracted from a digital representation of the terrain with field data, and the resulting model, show that TINs can be successfully used for floodplain determination and representation purposes.en_US
dc.description.departmentWaller Creek Working Groupen_US
dc.identifier.urihttps://hdl.handle.net/2152/87719
dc.identifier.urihttp://dx.doi.org/10.26153/tsw/14663
dc.language.isoengen_US
dc.publisherUniversity of Texas at Austin Center For Research in Water Resourcesen_US
dc.relation.ispartofWaller Creek Working Groupen_US
dc.relation.ispartofseriesCRWR;99-5
dc.rights.restrictionOpenen_US
dc.subjectWaller Creeken_US
dc.subjectAustinen_US
dc.subjectwatersheden_US
dc.subjecthydrologic modelen_US
dc.subjecthydraulic modelen_US
dc.subjectflooden_US
dc.subjecttriangular irregular networksen_US
dc.subjectTINsen_US
dc.titleFloodplain Visualization using TINsen_US
dc.typeTechnical reporten_US
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