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The ATLSS High Resolution Topography/Hydrology Model

The ATLSS High Resolution Topography/Hydrology Model. Scott M. Duke-Sylvester ATLSS Project : University of Tennessee. Project web-site : www.atlss.org E-mail : sylv@tiem.utk.edu. Overview of Presentation.

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The ATLSS High Resolution Topography/Hydrology Model

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  1. The ATLSS High Resolution Topography/Hydrology Model Scott M. Duke-Sylvester ATLSS Project : University of Tennessee Project web-site : www.atlss.org E-mail : sylv@tiem.utk.edu

  2. Overview of Presentation • Purpose of the High Resolution Topography (HRT)/High Resolution Hydrology (HRH) models • HRT/HRH creation • Verification, calibration and validation • Versions and availability

  3. Purpose of the HRT/HRH • To provide an estimate of finer scale spatial variation in hydrology for the ATLSS models • Resolution : 500x500 meters • Used by all ATLSS models including: • SESI models • Fish model (ALFISH) • Deer/panther model

  4. Why 500x500 meters? • Plants and animals respond to local variations in hydrology at a spatial resolution finer than the 2x2 mile SFWMM blocks: • Tree islands • Transition from slough to prairie • Permanent ponds vs. marsh with transient water depths

  5. Tree Island : Skinner’s Camp 4 miles HRT SFWMM 4 miles

  6. Slough to prairie transitionVariation in water depths SFWMM HRH Wet 0 Dry

  7. HRT Features • Common resolution : 500x500 meters • Available : 30x30 meters • Coverage : Most of the natural areas of SF

  8. HRH features • Common resolution : 500x500 meters • Common time step : 5 days • Time span : Jan 1 1965 - Dec 31 1995 • Adaptable to longer SFWMM runs • Spatial coverage : SFWMM region • Adaptable to use with other data sets

  9. HRT Creation • Basic premise : Plants are present in locations where local topography and hydrology combine to create favorable hydroperiods • Topography + Hydrology => Vegetation • Vegetation + Hydrology => Topography

  10. Inputs • Hydrology : SFWMM Calibration/verification run • Vegetation : FGAP • Hydroperiod ranges : Literature, expert opinion • Adaptable to other data sets

  11. Hydrology Data • Transform the Stage Height data into hydroperiod histograms. • Describes the number of days at or above each elevation. • We use an average of values from 1986 to 1995. • Currently based on the Calibration/Validation (Cal/Val) run of the SFWMM.

  12. Hydroperiod values for vegetation types. • For each vegetation type in the FGAP map we estimate a range of hydroperiods. • The hydroperiod used for any particular cell in the FGAP map is interpolated as follows: • Hydroperiod values are drawn from the literature.

  13. Vegetation Map • Raster Map • high spatial resolution • high spatial heterogeneity • Each cell contains an index value which represents one vegetation type. • Currently based on the Florida GAP Map.

  14. Processes Ep

  15. HRH Creation • 2x2 mile SFWMM hydrology data is distributed over a 500x500 meter HRT • Redistribution takes place on a 2x2 mile cell basis • Total daily water volume is preserved in each cell • Resulting hydrology has a 500x500 meter resolution

  16. Verification • Simple visual inspection • e.g. tree islands are higher than surrounding slough • Comparison to independently computed values • Function testing

  17. Calibration • The main features of the HRT that can be calibrated are the hydroperiod ranges for each vegetation type. • Hydroperiod ranges estimated from published literature • Expert opinion

  18. HRH Validation • Comparison of HRH water depths to measured water depths • Time series : Feb, Apr, Jul, Oct, Dec 1995 • Region : WCA-3 and Shark River Slough • 16 sites, 3 plots at each site • r2 for HRH to field data : 0.289 • r2 for SFWMM to field data : 0.236 • Gaff, H. 1999. Spatial heterogeneity in ecological models : two case studies. PhD. Dissertation, University of Tennessee.

  19. Comparison to USGS HAED Compared the mean elevation and variance between the HRT, USGS High Accuracy Elevation Data (HAED) and SFWMM data. HRT variance is more similar to HAED variance HRT mean is lower than either SFWMM or HAED mean HRT Validation

  20. Conclusion • HRT is not an exact fit to measured elevations. • HRT is generating a level of topographic variation consistent with the HAED data in many instances. • Further calibration of model will improve the fit between the HRT output and HAED.

  21. Application to Restoration Planning • Provides an estimate of topography and hydrology to other models at a spatial resolution relevant to ecological modeling

  22. Versions • Version 1.0 • Available for use today • Has been used in the past • 1997-1998 hydrology scenario evaluation • Based on: • FGAP 2.1 • Hydroperiod values from Michael Huston • SFWMM 3.4, Calibration/verification run • Version 2.0 • Available by June 30 2002 • Based on: • FGAP 6.6 • Hydroperiod values from Paul Wetzel • SFWMM 3.5, Calibration/verification run • Calibrated with latest USGS HAED

  23. Availability • HRT maps • Created at UT • Maps are available to collaborating agencies • ENP, SFWMD … • High Resolution Hydrology • Created as part of the ATLSS SESI package • Sun/Solaris Workstations • ENP

  24. Collaborators/Contributors • FGAP : Leonard Pearlstine • SFWMM : Ken C. Tarboton, SFWMD • ATLSS : • Paul Wetzel, ATLSS • Charley Comiskey, ATLSS • Michael Huston, ORNL

  25. E-mail : sylv@tiem.utk.edu • Web site : www.atlss.org/~sylv

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