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

More documents

Recommendations

Info

for the transfer process. Also, the project, flow, and plan hydraulic files in HEC-RAS are updated to set up a new run configuration.Figure 3.8 Time Series Transfer Component3.4.2 External Execution of HEC-HMSA previously set HEC-HMS hydrologic model for the basin is called withreference to the previous precipitation records now stored in the HEC-DSSsystem. The execution of HEC-HMS is done through a batch file based on theproject file and proper RUNID name.3.4.3 Transferring Flow Records to GeodatabaseThe output flow discharges from HEC-HMS corresponding to watershedoutlet points that in turn represent flow change locations (Cross Sections) in HEC-RAS are transferred to the Geodatabase. This component is used at various stepsalong the process to transfer time series back and forth from HEC-DSS to GIS-Geodatabase format and vice versa.40
3.4.4 External Execution of HEC-RASA previously set HEC-RAS model for the river system is called withreference to the previous flow change location records. The execution of HEC-RAS is done through the HEC-RAS object library that exposes some executionand writing options.3.4.5 Automated Floodplain DelineationFlood mapping also plays an important role in floodplain analysis. Thetask of generating a flood depth and flood extent map relies heavily on the qualityof the previous modeling phase as well as on the quality of the available terrainmodel of the floodplain (Digital Elevation Model).The simulated volumes of water must follow flow paths that honor thenatural and artificial barriers over the floodplain. For this, adequate modeling andterrain representations of the stream-floodplain system must be available to carryon reliable standard and automated methodologies for floodplain delineation.3.5 INTEGRATING ELEMENTSIt is a common engineering practice to use a hydrologic model (i.e., HEC-HMS) to compute the runoff from a watershed and then use a hydraulic model(i.e., HEC-RAS) to compute the resulting water surface profiles with great levelaccuracy for use in flood related studies, like FEMA’s flood insurance studies(FIS) (Bedient and Huber, 1992). Under the Map2Map application framework,HEC-HMS and HEC-RAS simulations are integrated through flow exchangepoints georeferenced in a GIS framework, and executed in an integrated sequenceusing the new visual programming environment for batch geoprocesses, the41
Page 3 and 4: Table of ContentsList of Figures ..
Page 5 and 6: 4.1.12 The XML2GDB Script Tool ....
Page 7 and 8: Figure 3.24 Components of a Steady
Page 9 and 10: Figure 4.50 Create Flood Inundation
Page 11 and 12: Chapter 1 Introduction1.1 BACKGROUN
Page 13 and 14: for undeveloped or natural conditio
Page 15 and 16: All the previous statements favor t
Page 17 and 18: science, and engineering models as
Page 19 and 20: Different approaches have been used
Page 21 and 22: generic and self-described formats,
Page 23 and 24: externally executed from a central
Page 25 and 26: though GIS-based, the system does n
Page 27 and 28: Geographic Information Systems, Arc
Page 29 and 30: By defining the three basic functio
Page 31 and 32: containing an inventory of damage s
Page 33 and 34: Data Models in charge of storing an
Page 35 and 36: Figure 3.1 Floodplain Modeling Sche
Page 37 and 38: either with Schematic Nodes (for Su
Page 39 and 40: channel cross sections, available H
Page 41 and 42: sequential data, called pathnames,
Page 43 and 44: Figure 3.5 NEXRAD square cells (873
Page 45 and 46: geodatabase formatted with the Arc
Page 47 and 48: The CrossSection feature class in A
Page 49: geodatabase (under Arc Hydro format
Page 53 and 54: analysis. In particular, GIS has be
Page 55 and 56: 3.5.3 Model-Specific ElementsA geog
Page 57 and 58: Figure 3.11 Geographic and Hydrolog
Page 59 and 60: For HEC-RAS, the connectivity is ac
Page 61 and 62: cross sections in the hydraulic mod
Page 63 and 64: Section line for a RAS cross-sectio
Page 65 and 66: from the geodatabase back into the
Page 67 and 68: Figure 3.19 Relationship Classes fo
Page 69 and 70: Figure 3.20 DSS Time Series content
Page 71 and 72: Figure 3.22 Extended Time Series Co
Page 73 and 74: Figure 3.23 Creating a Flow File fr
Page 75 and 76: etween the HEC-DSS file system and
Page 77 and 78: The more specific steps for the pos
Page 79 and 80: Chapter 4 Map2Map Components4.1 MOD
Page 81 and 82: A subset of NEXRAD time series data
Page 83 and 84: A folder location is also provided
Page 85 and 86: Figure 4.4 Radar2GDB Model Componen
Page 87 and 88: ecords. Figure 4.6 illustrates the
Page 89 and 90: Figure 4.8 Time Series Tables and R
Page 91 and 92: having different formats and that a
Page 93 and 94: Part E: Time Interval of stored dat
Page 95 and 96: execution time and for their corres
Page 97 and 98: on the steps needed to transfer the
Page 99 and 100: Len_sBTime (I): The length of the s
Page 101 and 102:
52: Invalid precision exponent spec
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
Page 115 and 116:
ased on a process handle (a program
Page 117 and 118:
These simple command line statement
Page 119 and 120:
To programmatically accomplish this
Page 121 and 122:
to provide the hydraulic input for
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
Page 133 and 134:
accomplish this have been developed
Page 135 and 136:
straight forward for all time stamp
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
Page 145 and 146:
There are not specific valid values
Page 147 and 148:
catalog list. For the DSS2GDB appli
Page 149 and 150:
4.1.9.1 Opening the HEC-DSS fileThe
Page 151 and 152:
channel (the hydraulic representati
Page 153 and 154:
the model if the new configuration
Page 155 and 156:
the main program as a public module
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
Page 187 and 188:
case that was developed for Map2Map
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
Page 195 and 196:
for it. Finally, the DigitalStorm2H
Page 197 and 198:
model for water resources (Maidment
Page 199 and 200:
Hydro, the HydroJunctionHasCrossSec
Page 201 and 202:
involved in the transformation of r
Page 203 and 204:
process model in sequence. For the
Page 205 and 206:
5.6 A TRUE SPATIAL APPROACHAutomate
Page 207 and 208:
time series between NEXRAD, the HEC
Page 209 and 210:
value of the entire runoff hydrogra
Page 211 and 212:
case study. Bigger watersheds (abov
Page 213 and 214:
The first step consists in installi
Page 215 and 216:
3.7 Map2Map UsageAll of the model b
Page 217 and 218:
Congratulations! You have successfu
Page 219 and 220:
Once the simplified version of Arc
Page 221 and 222:
cells that cover your study area an
Page 223 and 224:
Second, the user needs to modify th
Page 225 and 226:
Appendix BMap2Map CD Content1 CD Da
Page 227 and 228:
o hmsproj - contains folders with H
Page 229 and 230:
Goodchild, M.F., Steyaert, L.T., an
Page 231 and 232:
Olsen R. J., Beling, P. A., Lambert
Page 233 and 234:
Werner, M. G. F. 2001. Impact of gr
show all

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

You also want an ePaper? Increase the reach of your titles

Delete template?

Save as template?