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Watershed delineation and data preparation for Watershed delineation and data preparation for groundwater modeling using GIS groundwater modeling using GIS
in the Savannah River Sitein the Savannah River Site
GIS term project presentationGIS term project presentation
November 25, 2003November 25, 2003
Prepared by Jaehak JeongPrepared by Jaehak Jeong
OutlineOutline
Introduction
Objective
Data description
Watershed Delineation
Infiltration rate
Conclusion
Future work
ObjectiveObjective
To model the surface water hydrology by
delineating the watershed
To construct the infiltration grid which represents
the topology and the geography for groundwater
modeling
To get friendly with the ArcGIS
Site descriptionSite description• Located at the border of SC and GA
• Occupies 310 square miles. (about the size of the Washington, D.C. beltway)
• Constructed during the early 1950s to produce the basic materials for nuclear weapons (primarily tritium and plutonium-239)
• Included on the National Priorities List (NPL) in 1989.
• Old Radioactive Waste Burial Ground (ORWGB) is identified as a RCRA/CERCLA unit
GIS DataGIS Data
Digital Elevation Model (DEM)Digital Elevation Model (DEM) Downloaded from the “seamless.usgs”, EROS Data CenterDownloaded from the “seamless.usgs”, EROS Data Center Grid cell size = 30mGrid cell size = 30m
National Hydrography Dataset (NHD) National Hydrography Dataset (NHD) Stream network, downloaded from the USGSStream network, downloaded from the USGS
Statsgo - State Soil Database (1:250,000 scale), USDAStatsgo - State Soil Database (1:250,000 scale), USDA Contains soil properties and soil interpretations for engineering, water Contains soil properties and soil interpretations for engineering, water
management, etc and wildlife uses of the soil. management, etc and wildlife uses of the soil. Hydrologic soil groups (A,B,C and D)Hydrologic soil groups (A,B,C and D)
Land Use/Land Cover (LULC) data, EPALand Use/Land Cover (LULC) data, EPA 9 categories of major land use types.9 categories of major land use types.
Data PreparationData Preparation
DEM quadrangles were merged into one. ( from ’52’ to ‘1’ )DEM quadrangles were merged into one. ( from ’52’ to ‘1’ )
Merged DEM was masked onto the 1Km buffered boundary Merged DEM was masked onto the 1Km buffered boundary coverage.coverage.
NHD, Statsgo, LandUse data were clipped on the 1Km buffered NHD, Statsgo, LandUse data were clipped on the 1Km buffered boundary coverage.boundary coverage.
Projection : UTM Zone 17Projection : UTM Zone 17
Datum : North American Datum 1983 Datum : North American Datum 1983
Units : metersUnits : meters
Terrain PreprocessingTerrain Preprocessing
1. DEM Reconditioning
2. Fill Sinks
3. Flow Direction
4. Flow Accumulation
5. Stream Definition
6. Stream Segmentation
7. Catchment Grid
8. Catchment Polygon
9. Drainage Line
10.Adjoint Catchment
11.Drainage Point
Watershed DelineationWatershed Delineation
Infiltration rate estimationInfiltration rate estimation
y = 0.1743x + 9.6831
R2 = 0.2257
0
10
20
30
40
50
60
0 20 40 60 80
Monthly Precipitation (cfs)
Mo
nth
ly R
un
off
(cfs
)
• Infiltration rate ( Precipitation – Runoff – Evaporation ) = 47 in/yr - 0.174 * 47 in/yr - 0.7 * 50 = 3.8 in/yr
• Runoff at the Site No.7 at SRS
Fac : 36,087 cells => 3.5 * 108 ft2
• Precipitation at CLARK HILL 1 W, SC
• Pan Evaporation rate
- 50 in/yr
cfs56.22592000sec
month)
0.3048mft
(30ms36,087cell12inft
month5in
ionPrecipitatVolumetric 2
Data Preparation for Infiltration rate GridsData Preparation for Infiltration rate Grids
SCS curve equation for direct SCS curve equation for direct runoffrunoff
Intersect (GeoProcessing Wizard)Intersect (GeoProcessing Wizard)
+
)0.8S(P)0.2S(P
Q,10CN1000
S2
Land Use Statsgo
Infiltration Grid Infiltration Grid
ORWBG
Four Mile Branch
Infiltration Rate Grids Infiltration Rate Grids
infiltgrid
[in/yr]
12.5
14.8
16.2
ORWBG
Four Mile Branch
MODFLOW 2000MODFLOW 2000
Three-dimensional finite-difference groundwater model Three-dimensional finite-difference groundwater model
‘‘RCH’RCH’ package in MFI2K.EXEpackage in MFI2K.EXE
Groundwater pathlines from ORWBGGroundwater pathlines from ORWBG
to FMBto FMB
Produced by Dr.Charbeneau
Future workFuture work Pollutants loading due to Non-point Source Pollution Pollutants loading due to Non-point Source Pollution Analysis of the Monitoring well dataAnalysis of the Monitoring well data
Thanks toThanks to Gill Strassberg, CRWRGill Strassberg, CRWR Venkatesh M Merwade, CRWRVenkatesh M Merwade, CRWR Lynn Shirley, Ph.D, The University of South CarolinaLynn Shirley, Ph.D, The University of South Carolina Dr.MaidmentDr.Maidment