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Application of GIS and Terrain Analysis to Watershed Model Calibration for the CHIA Project. Sam Lamont Robert Eli Jerald Fletcher. Background. CHIA: Cumulative Hydrologic Impact Assessment of a mine site Required of WVDEP , for each proposed mine permit

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application of gis and terrain analysis to watershed model calibration for the chia project

Application of GIS and Terrain Analysis to Watershed Model Calibrationfor the CHIA Project

Sam Lamont

Robert Eli

Jerald Fletcher

background
Background
  • CHIA: Cumulative Hydrologic Impact Assessment of a mine site
  • Required of WVDEP , for each proposed mine permit
  • Surface and groundwater quality and quantity
wvu s role
WVU’s Role
  • Ultimate goal: Graphical tool to simulate pre- and post-mining conditions
  • Water quantity: Calibrate watershed model (HSPF) to 235 basins in WV
basins gis framework
BASINS-GIS Framework
  • ArcView based environment for display and analysis of watershed features
  • Develops input files for HSPF
  • - watershed file (landuse, slope, area)
  • - stream network
  • - reach attributes
  • - point sources
  • This project: WCMS
hspf hydrologic systems program fortran
HSPF: Hydrologic Systems Program - Fortran
  • Continuous
  • Calculates water balance for each time step
  • R = P – ET – IG – S
  • where: R = Runoff
  • P = Precipitation
  • ET = Evapotranspiration
  • IG = Deep/Inactive Groundwater
  • S = Change in soil storage
  • Surface and sub-surface hydrology
  • Inputs = Precip, PET, Temp
  • Output = Simulated flow
slide7

Modeled Precipitation Grid

- Hourly Precip

- 1948 – 2002

- 5 km resolution

how hspf represents a watershed
How HSPF Represents a Watershed

Outlet point

  • Example:
  • - 5 Sub-watersheds
  • 5 Stream reaches
  • (Storage-Outflow routing)
  • - Land use types
  • Forest (Steep,Moderate, Mild)
  • Shrub-land
  • Pasture/Grassland
  • Urban
  • Mine
  • Barren
  • Row Crop
  • Wetland
  • Surface Water

Watershed boundary

Stream reach

Flow Direction

model calibration
Model Calibration
  • Trial and error:

1. Run Model

2. Compare output

3. Adjust parameters

4. Repeat

  • Other software assists this process
slide14

Further Proposed Terrain Analysis for Calibration Improvement

  • Hoes does watershed shape and structure relate to hydrology?
  • Searching for an index defining hydrologic characteristics.

Some examples…

topographic index
Topographic Index
  • Beven and Kirkby, 1979

TI = ln(a/tanB)

a = area

B = slope

(relative wetness)

Example: Abes Run, Canaan Valley

drainable volume
Drainable Volume

- Volume of watershed above a particular elevation

slide18

Future steps:

- Fine-tune calibration: Continue searching for patterns

- Validate model

- Mine site modeling

- Link with WCMS

Conclusion