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PRMS-storm and Dimensions

PRMS-storm and Dimensions. consists of PRMS-daily steps More detailed constraints due to routing Plus two additional dimensions. PRMS-storm Mode. Additional Dimensions. Channel Segments (NCHAN) Overland Flow Planes (NOFPL) GIS map of NOFPL == GIS map of NHRU makes life a lot simpler….

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PRMS-storm and Dimensions

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  1. PRMS-storm and Dimensions

  2. consists of PRMS-daily steps • More detailed constraints due to routing • Plus two additional dimensions PRMS-storm Mode

  3. Additional Dimensions • Channel Segments (NCHAN) • Overland Flow Planes (NOFPL) • GIS map of NOFPL == GIS map of NHRU makes life a lot simpler…

  4. NCHAN & NOFPL

  5. Drainage Network as NCHAN Several assumptions: • Strict NCHAN arrangement • NCHAN links should extend to ridge • NCHAN ids must increase downstream • Don’t need to be sequential • NCHAN ids must be packed • Max id = # of NCHANs • No more than 3 upstream NCHANs for each NCHAN • Watch out for short links!!! • Numerical instability • Creates bogus NOFPL/HRUs

  6. HRUs as NOFPL Several assumptions: • Strict NOFPL-NCHAN topology • Each NOFPL adjacent to single NCHAN • Cannot drain to multiple nchans • Each NOFPL extends from channel to ridge • One NOFPL cannot drain to another NOFPL • Only 1 or 2 NOFPLs per NCHAN • “left bank” and “right bank” NOFPLs • Avoid really small NOFPL units • Violations will cause a loss of info to model • Possible numerical instability!

  7. Inter-dimension Relationships • NCHAN is used to derive NOFPL • Must derive NCHAN so that NCHAN is “healthy” • Must derive NCHAN so that NOFPL is “healthy” • Always think about PRMS-storm parameters!

  8. one – watershed outline • usually “basin” (ArcInfo GRID) • has only one zone, which encloses entire area to be modeled PRMS-storm Mode

  9. nhru – number of hydrologic response units • user-specified map name • flexible delineation strategy • Problem Set uses “hillslope” concept PRMS-storm Mode

  10. nradpl – number of radiation plane units • user-specified map name • provides model with information about • Slope • Aspect • Latitude PRMS-storm Mode

  11. nssr: number of sub-surface reservoirs • Normally set to “1” in parameter file • not usually derived with GIS Weasel • Difficult to find GIS data about things below the surface • can use nhru map • Creates one sub-surface reservoir for each hydrologic response unit PRMS-storm Mode

  12. ngw: number of ground-water reservoirs • Normally set to “1” in parameter file • not usually derived with GIS Weasel • Difficult to find GIS data about things below the surface • can use nhru map • Creates one sub-surface reservoir for each hydrologic response unit PRMS-storm Mode

  13. establish AOI dimension one • drainage network “fullpath” dimension nchan • contributing area >> two • ID # Manipulation dimensions nhru,nofpl • radiation plane dimension nradpl • Parameterize • prms-topographic, prms-non-topographic-data_bin PRMS-storm Mode Steps

  14. Good News • You’ve already made these maps for your PRMS-daily exercise • We’ll examine the results now… • then we’ll parameterize

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