Integrated Groundwater Surface Water Modeling of the Green Swamp, Florida
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1 Integrated Groundwater Surface Water Modeling of the Green Swamp, Florida Data Management Challenges and Opportunities Peter J. Singhofen, P.E. Gordon L. McClung, P.E Streamline Technologies, Inc Town Plaza Ct. Winter Springs, FL AWRA Spring Specialty Conference GIS and Water Resources VIII May 12-14, 2014 Snowbird Resort Salt Lake City, Utah All Rights Reserved
2 2 Work in Progress All Results are Preliminary
3 The Green Swamp (895 sq.mi.) Cape Canaveral Orlando Tampa Bay 3
4 Headwaters to Three Rivers Withlacoochee River (91%) Ocklawaha River (4%) Hillsborough River (5%) 4
5 5 Source: SWFWMD
6 6 Source: SWFWMD
7 7 Source: USGS, 1961
8 Diffused Leakage Lateral Seepage Source: USGS,
9 A A Out Crop Area (no confining layer) 9
10 10 Source: SWFWMD
11 2004 Hurricane Season Charley August 14 th Frances September 5 th Jeanne September 26 th Three Hurricanes in Six Weeks 11
12 Charley Frances Jeanne 22 of Rain 12
13 A Pot. Surface September 30 Ground A Pot. Surface August 1 Slope < 0.02% (very flat) 13
14 Intersection of Potentiometric and Ground Surfaces August 1, 2004 Produced in ArcScene 14
15 Intersection of Potentiometric and Ground Surfaces September 30, 2004 Produced in ArcScene 15
16 Important Modeling Considerations Complexities of Riverine Flow with Broad Flood Plains Interactions with Surficial Aquifer Upward and Downward Leakage Spatiotemporal Boundary Counditions Rainfall ET Potentiometric Surfaces Continuous Simulation 16
17 ICPR 4 1D/2D Surface Hydraulics 2D Groundwater (Regional Approach) Flexible Computational Meshes Single Event Plus Continuous Simulation Georeferenced 64-Bit Application Multi-Core Processing 17
18 18 Development of Spatiotemporal Boundary Conditions
19 19 Deep Well Locations
20 20 Records Obtained from the SWFWMD WMIS
21 Individual gridded DEMs created at 3-day intervals from August 1to November 1, The 31 DEMs were imported to ICPR and intersected with the GW computational mesh to form spatiotemporal boundary conditions. Empirical Bayesian Kriging ESRI Geostatistical Analyst Tool Set 21
22 926 2x2km cells 15-minute increments from 1995 to present is available NEXRAD FISHNET Imported as Thematic Polygon Layer 22
23 NEXRAD Data obtained from SWFWMD GIS in ICPR format 1 text file per pixel placed in Resources folder NEXRAD DATA 23
24 Other Thematic Polygon Layers Soil Zones Land Cover Zones GW Property Zones % Impervious Fillable Porosity Soil Moisture Vert. Conductivity Surface Roughness Horiz. Conductivity Crop Coefficients Leakage Factors Root Depths Irrigation 24
25 Mesh Generation finite volume approach - 2d surface flow - Honeycombs (lump mass balance eqs) Triangles 25 Diamonds (lump momentum eqs)
26 2D Groundwater Flow Finite Element Approach Triangular Mesh 6-Point Quadratic Interpolation Function Heads are calculated at nodes Includes: Saturated Horizontal Flow Leakage Through Confining Layer Seepage at the Ground Surface 26
27 Mesh Generation finite element approach - 2d groundwater flow - Triangles Honeycombs formed around vertices and mid-nodes 27
28 NEXRAD SW Honeycomb Soils Land Cover 28 GW Honeycomb
29 Each intersecting sub-polygon serves as a conduit between the SW system and the GW system. 868,000 sub-polygons 147,000 surface edges 116,500 gw nodes 29
30 30 Simulation Results
31 September 30, Flood Depths > 3
32 September 30, 2004 Out Crop Polygon 32 Change in GW Elevation
33 September 30, 2004 Out Crop Polygon 33 Seepage Locations
34 Model Recorded 34 Trilby Gage Withlacoochee River (570 sq. mi.)
35 Water Budget Component Volume (inches) Inflows Rainfall Upward Leakage 2.11 External 0.21 Total Inflow Outflows ET 7.11 Surface Outflow 8.07 Total Outflow Storage Vadose 1.38 Surficial Aquifer Surface 3.52 Total Storage Total Area: 895 sq. mi.
36 Upward Leakage (flow from Floridan Aquifer to surficial aquifer) Upward leakage is 7.0% of total inflow Most of the upward leakage occurs near the main stem of the Withlacoochee River The 2.11 of leakage is 26.1% of the total surface outflow (8.07 ) 36
37 Seepage (flow from surficial aquifer to surface) Total seepage: 5.81 Seepage from inundated areas: 4.63 Seepage from uninundated areas: 1.18 Leakage as % of total seepage: 36.3% 37
38 Questions (circa 1880s) 38
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Integrated 2D Surface-Groundwater Modeling of the Green Swamp, Florida Peter J. Singhofen, P.E. Gordon L. McClung, P.E Streamline Technologies, Inc. 1900 Town Plaza Ct. Winter Springs, FL 32708 407-679-1696
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