Converting a NEXRAD Rainfall Map into a Flood Inundation Map by ...

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implement a call to the ZCLOSE subroutine to properly release control over thesource DSS file.4.1.9 The GDB to RASDSS Script ToolThe ability to read data from HEC-DSS has been also added to HEC-RASin order to extract flow and stage data for use in water surface profile calculations.The extraction of flow data is normally done from DSS files generated by HEC-HMS simulations over the same watershed study area under hydraulic analysis.The GDB2RASDSS script tool transfers time series data from thegeodatabase to a HEC-RAS DSS binary file. Additionally, the tool updates theHEC-RAS project file (.prj), plan file (.p0*), and flow file (.f0*) to reflect the newtime series records being fed by the geographic integration. This tool is run priorto HEC-RAS execution, to provide streamflows at certain cross sectionsrepresenting flow exchange points.Figure 4.26 GDB2RASDSS Model Component138
4.1.9.1 Opening the HEC-DSS fileThe first thing done by the GDB2RASDSS script tool is to open orgenerate the HEC-DSS file that stores the streamflow records for the new HEC-RAS input configuration. The ZOPEN DSS subroutine is used for attaching thenew or existing DSS file to the GDB2RASDSS application and also for obtainingbasic information from the file that allows the application to write new records toit. As mentioned before, the ZOPEN is the first DSS subroutine to be called wheninterfacing with the HEC-DSS system. Again, the DSS file does not need to existbefore the ZOPEN subroutine is called and it will be created if it is not present.4.1.9.2 Reading Time Series InformationThe next section of the application is in charge of reading the Arc Hydrotime series table and the DSSTSType with all the HEC-DSS descriptors for eachflow change location. By reading this information the application is able to writeinto a new or existing HEC-DSS file, and write the new flow file based on thenew flow hydrographs and for the HEC-RAS setup.The application reads the DSSTSType table to get all the DSS descriptorsfor each pathname containing records for a flow change location from the DSScatalog. The DSS descriptors (Figure 3.21) are stored in a 2-D array in which thefirst dimension contains each flow change location point and the seconddimension contains each of the needed DSS descriptors. The DSS descriptorsneeded for the writing of records into a HEC-DSS file are described in Table 4.9.139
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Table of ContentsList of Figures ..
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4.1.12 The XML2GDB Script Tool ....
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Figure 3.24 Components of a Steady
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Figure 4.50 Create Flood Inundation
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Chapter 1 Introduction1.1 BACKGROUN
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for undeveloped or natural conditio
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All the previous statements favor t
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science, and engineering models as
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Different approaches have been used
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generic and self-described formats,
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externally executed from a central
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though GIS-based, the system does n
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Geographic Information Systems, Arc
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By defining the three basic functio
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containing an inventory of damage s
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Data Models in charge of storing an
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Figure 3.1 Floodplain Modeling Sche
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either with Schematic Nodes (for Su
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channel cross sections, available H
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sequential data, called pathnames,
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Figure 3.5 NEXRAD square cells (873
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geodatabase formatted with the Arc
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The CrossSection feature class in A
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geodatabase (under Arc Hydro format
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3.4.4 External Execution of HEC-RAS
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analysis. In particular, GIS has be
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3.5.3 Model-Specific ElementsA geog
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Figure 3.11 Geographic and Hydrolog
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For HEC-RAS, the connectivity is ac
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cross sections in the hydraulic mod
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Section line for a RAS cross-sectio
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from the geodatabase back into the
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Figure 3.19 Relationship Classes fo
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Figure 3.20 DSS Time Series content
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Figure 3.22 Extended Time Series Co
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Figure 3.23 Creating a Flow File fr
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etween the HEC-DSS file system and
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The more specific steps for the pos
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Chapter 4 Map2Map Components4.1 MOD
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A subset of NEXRAD time series data
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A folder location is also provided
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Figure 4.4 Radar2GDB Model Componen
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ecords. Figure 4.6 illustrates the
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Figure 4.8 Time Series Tables and R
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having different formats and that a
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Part E: Time Interval of stored dat
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execution time and for their corres
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Page 99 and 100: Len_sBTime (I): The length of the s
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Page 103 and 104: methods: user hyetograph, user gage
Page 105 and 106: Once the hyetograph is defined (for
Page 107 and 108: The resulting runoff hydrograph is
Page 109 and 110: Thus, the time period for the entir
Page 111 and 112: After the ZSRTS subroutine is execu
Page 113 and 114: Figure 4.12 HMSCaller Model Compone
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Page 117 and 118: These simple command line statement
Page 119 and 120: To programmatically accomplish this
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Page 123 and 124: information into the extended Arc H
Page 125 and 126: The HydroJunction, used for connect
Page 127 and 128: Once the identification of flow cha
Page 129 and 130: As with the GDB2HMSDSS, the first t
Page 131 and 132: 4.1.7 Time Series ExtractionOnce th
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Page 137 and 138: As opposed to HEC-DSS, the Arc Hydr
Page 139 and 140: Table 4.4: Variable Type Equivalenc
Page 141 and 142: ZCAT DSS subroutines) and stored in
Page 143 and 144: Table 4.5: Time Interval Equivalenc
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Page 147: catalog list. For the DSS2GDB appli
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Page 157 and 158: Then, the RASCaller application acc
Page 159 and 160: Figure 4.31 ProjectName Property in
Page 161 and 162: Figure 4.33 RunSteady Method in RAS
Page 163 and 164: Figure 4.34 ExportGIS Method in RAS
Page 165 and 166: data structures delivered by every
Page 167 and 168: The two most well-known models for
Page 169 and 170: The water surface elevations obtain
Page 171 and 172: Once the water surface elevations f
Page 173 and 174: Generate a suitable water surface m
Page 175 and 176: Figure 4.42 2 Foot-Contour Lines fo
Page 177 and 178: Figure 4.43 Rosillo Creek’s terra
Page 179 and 180: standard ArcGIS tool), is used in M
Page 181 and 182: By doing this, the water surface el
Page 183 and 184: Figure 4.49 Create Flood Polygon Mo
Page 185 and 186: Int OperationThe Integer operation
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Page 189 and 190: contours (isohyetals) or by interpo
Page 191 and 192: design storm input given its possib
Page 193 and 194: Figure 4.55 Workflow for Extracting
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Hydro, the HydroJunctionHasCrossSec
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involved in the transformation of r
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process model in sequence. For the
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5.6 A TRUE SPATIAL APPROACHAutomate
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time series between NEXRAD, the HEC
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value of the entire runoff hydrogra
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case study. Bigger watersheds (abov
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The first step consists in installi
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3.7 Map2Map UsageAll of the model b
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Congratulations! You have successfu
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Once the simplified version of Arc
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cells that cover your study area an
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Second, the user needs to modify th
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Appendix BMap2Map CD Content1 CD Da
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o hmsproj - contains folders with H
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Goodchild, M.F., Steyaert, L.T., an
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Olsen R. J., Beling, P. A., Lambert
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Werner, M. G. F. 2001. Impact of gr
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Converting a NEXRAD Rainfall Map into a Flood Inundation Map by ...

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