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Status of Incorporating Ice Into NWS Hydraulic Models

Status of Incorporating Ice Into NWS Hydraulic Models. Janice Sylvestre NOAA NWS Office of Hydrologic Development In Collaboration with Dr. Steven F. Daly ERDC/CRRL. 2004 Cold Regions Workshop November 15-18, 2004 NWS Training Center Kansas City, MO. Objective.

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Status of Incorporating Ice Into NWS Hydraulic Models

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  1. Status of Incorporating Ice Into NWS Hydraulic Models Janice Sylvestre NOAA NWS Office of Hydrologic Development In Collaboration with Dr. Steven F. Daly ERDC/CRRL 2004 Cold Regions Workshop November 15-18, 2004 NWS Training Center Kansas City, MO

  2. Objective • Add river ice modeling capability to NWS FLDWAV model based on ERDC/CRREL methodology developed by Dr. Steven Daly. After Daly, 2004

  3. Hydraulic Component: Modifications to account for the presence of ice  • Geometric terms in continuity and momentum equations: • Area, Hydraulic Radius, roughness, conveyance • Dynamic modification of geometric “look-up” tables • Representation of the dynamic ice cover extent • Time varying ice roughness    After Daly, 2004

  4. FLDWAV Modeling Assumptions • River ice is stationary • Ice information from observations

  5. FLDWAV Input Parameters • For each ice block along the river: • Upstream & downstream location of ice block • Time period of ice block existence • Ice block formation period • Ice thickness • Specific weight of ice • Roughness coefficient for ice • A sensitivity analysis will be done on the parameters to determine how critical they are – which ones can be given default values?

  6. FLDWAV Test Area • River ice effects were observed when calibrating the Susquehanna River system • FLDWAV ice effect enhancement is being tested using this data

  7. March 20, 1999 – August 11, 2000 Affected by ice Verification Flood Period

  8. Ice jam confirmed in Wyoming County on Jan 25th. No other info available.

  9. Jan 5, 2000 Feb 16, 2000

  10. Continued Research • Test FLDWAV capability thoroughly in areas with observed data • Add ice movement option • Determine feasibility of modeling ice cover formation operationally

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