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The ATLSS High Resolution Topography HRT and High Resolution Hydrology HRH Models

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Cape Sable Sea Side Sparrow. Wading Birds. Fresh Water Fish. Alligator. Snail Kite ... Sparrows. Motivation for the HRT and HRH ... – PowerPoint PPT presentation

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Title: The ATLSS High Resolution Topography HRT and High Resolution Hydrology HRH Models


1
The ATLSS High Resolution Topography (HRT) and
High Resolution Hydrology (HRH) Models
Scott M. Duke-Sylvester The Institute for
Environmental Modeling University of
Tennessee sylv_at_tiem.utk.edu www.atlss.org/sylv L
ouis J. Gross University of Tennessee
2
Original idea and direction for the High
Resolution Topography and High Resolution
Hydrology came from Michael Huston at ORNL in
Oak Ridge, TN.
3
ATLSS Across Trophic Level System Simulation
  • Panther
  • Deer
  • Vegetation
  • Cape Sable Sea Side Sparrow
  • Wading Birds
  • Fresh Water Fish
  • Alligator
  • Snail Kite
  • High Resolution Topography
  • High Resolution Hydrology

4
Overview
  • Model Motivation and Goals
  • Model Design and Implementation
  • Inputs
  • Processes
  • Outputs
  • Results
  • Comparison to SFWMD elevation
  • Comparison to USGS High Accuracy Elevation Data
  • Discussion

5
ATLSS Philosophy
  • Fauna and flora of an area respond to local
    variation in the environment.
  • Differences between locations can have a strong
    influence upon dynamics at higher levels of
    organization.
  • Population
  • Community
  • Ecosystem

6
Motivation for ATLSS
  • Recently the motivation has been to provide an
    assessment of the relative impacts of different
    hydrology scenarios upon various biotic
    components of the South Florida Everglades.
  • Panthers
  • Sparrows

7
Motivation for the HRT and HRH
  • To model the responses of fauna and flora to
    differences in local conditions we need
    topography and hydrology with spatial variation.
  • We need to cover an area which is relevant for
    both the species in question and our need to
    understand the system.
  • Current elevation maps and hydrology data sets do
    not include the resolution and extent appropriate
    for modeling detailed biotic response to changing
    hydrology.

8
Extent
  • The area for which we need elevation data is
    described by the SFWMD Hydrology modeling area.

9
Resolution used by current ATLSS models
  • Deer 100x100 meter cells
  • Panther 100x100 meter cells
  • Fresh Water Fish 500x500 meters
  • Vegetation 100x100 meters

The HRT model is capable of generating elevation
data at a 30x30 meter resolution.
10
Elevation data sets currently available.
USGS High Accuracy Elevation Data
South Florida Water Management Districts
Elevation Map
11
Question
  • How do we generate topography and hydrology at
    the scale and extent relevant to the species of
    SF?
  • We combine data sets which are available to
    extrapolate small scale elevation for SF.

12
Model Design and Implementation
  • Model combines three primary inputs to compute
    elevation
  • Hydrology data
  • Vegetation type map
  • Vegetation hydroperiod values
  • The vegetation types are assumed to be at
    locations and elevations with appropriate
    hydroperiods for the species within them.

13
Input Hydrology Data
  • Spatial scale
  • most of SF
  • 2x2 mile resolution
  • Temporal scale
  • 1979-1995
  • daily time step
  • SFWMM Cal/Val

14
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.

15
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.

16
Spatial scale of inputs
  • It is important to note that the hydrology data
    and the vegetation data are provided at
    difference spatial scales.
  • Veg 30x30 meters
  • Hydro 2x2 miles
  • We need to preserve each resolution.
  • Veg resolution is needed for topography
  • Hydro resolution is needed to preserve water
    volume.

17
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.

18
Processes
Ep
19
Result High Resolution Topography (HRT)
4 miles
4 miles
20
4 miles
4 miles
4 miles
4 miles
21
High Resolution Hydrology
  • Created by combining the ATLSS HRT map and the
    SFWMD hydrology data.
  • Preserves water volume in each of the 2x2 mile
    cells of the SFWMD hydrology data.

22
High Resolution Hydrology
4 miles
4 miles
4 miles
4 miles
23
Comparison to the USGS High Accuracy Elevation
Data (HAED)
  • Compared the HRT, the SFWMD and the HAED.
  • Point-wise for each HAED region
  • Regional elevation means for each HAED region.

24
Comparison Results
  • Compared regional elevation means between the
    SFWMD, HAED and HRT (ANOVA)
  • Inconclusive, some means differ, some do not. No
    discernable pattern.
  • HRT has regional variance in elevation greater
    than SFWMD data.
  • The results indicate a need to refine the
    hydroperiod parameters
  • A more complete analysis of the differences
    between the HRT and HAED data can be found at
    www.atlss.org/sylv

25
Important outcome
  • At a regional scale the HRT is generating more
    spatial variability in elevations than the SFWMD
    elevation data.
  • HRT is capable of producing spatial variability
    which is more appropriate for modeling detailed
    biotic responses to changing hydrology.

26
Future Directions
  • Update to the Florida GAP v6.6
  • Implementing hydroperiod parameters.
  • Implement new algorithm
  • Genetic algorithm
  • Optimal search algorithm
  • Seek new input parameters
  • Make additional comparisons

27
Open problems
  • Scale of hydrology data
  • small areas represented by few cells.
  • How to handle water control structures
  • canals
  • levees
  • How to deal with SFWMM cell boundaries.
  • How to incorporate the HRT methodology and new
    elevation data sets.
  • How to use the HRT and the NSM together
  • Estuarine areas

28
Movie
29
Goals
  • To provide hydrology data with spatial
    heterogeneity at a scale which is meaningful to
    the plants and animals of South Florida.
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