Automation of DEM Cutting for Hydrologic/Hydraulic Modeling, TR-631, 2015

(2015) Automation of DEM Cutting for Hydrologic/Hydraulic Modeling, TR-631, 2015. Transportation, Department of

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Abstract

Hydrologic analysis is a critical part of transportation design because it helps ensure that hydraulic structures are able to accommodate the flow regimes they are likely to see. This analysis is currently conducted using computer simulations of water flow patterns, and continuing developments in elevation survey techniques result in higher and higher resolution surveys. Current survey techniques now resolve many natural and anthropogenic features that were not practical to map and, thus, require new methods for dealing with depressions and flow discontinuities. A method for depressional analysis is proposed that uses the fact that most anthropogenically constructed embankments are roughly more symmetrical with greater slopes than natural depressions. An enforcement method for draining depressions is then analyzed on those depressions that should be drained. This procedure has been evaluated on a small watershed in central Iowa, Walnut Creek of the South Skunk River, HUC12 # 070801050901, and was found to accurately identify 88 of 92 drained depressions and place enforcements within two pixels, although the method often tries to drain prairie pothole depressions that are bisected by anthropogenic features.

Item Type: Departmental Report
Keywords: Drainage, Flood hydrographs, Flood plains, Hydraulics, Hydrology, Watersheds, Des Moines River, Mississippi River, Missouri River, depressional analysis, digital elevation model, drainage, hydrologic analysis, hydrologic enforcement, LiDAR, watershed characterization, TR-631
Subjects: Natural resources and environment > Water resources
Natural resources and environment > Water resources > Watersheds
Transportation
Transportation > Data and Information Technology
Transportation > Environment > Water
ID Code: 18940
Deposited By: Leighton Christiansen
Deposited On: 02 Mar 2015 13:37
Last Modified: 12 Mar 2015 15:54
URI: http://publications.iowa.gov/id/eprint/18940