Effect of Digital Elevation Model (DEM) Resolution on the Hydrological and Water Quality Modeling
Publication: World Environmental and Water Resource Congress 2006: Examining the Confluence of Environmental and Water Concerns
Abstract
The resolution of digital elevation model (DEM) used for watershed delineation and data extracted from the delineated watershed relevant to hydrography plays an important role in the calibration of hydrological models. The effect of DEM resolution on the drainage length, watershed area and average slope are studied in many earlier works. DEM resolution can have impact on hydrologic modeling parameters, water quality simulation results. The impacts of DEM resolution on results of the watershed response and water quality modeling are studied using HSPF (Hydrologic Simulation Program Fortran) model applied to a watershed in Kentucky in this study. Three major streams in this watershed are impaired due to pathogen pollution according to the current state of Kentucky water quality standard set for recreation. The effects of DEM resolution on water quality modeling and calibration for fecal coliform bacteria are studied using a HSPF model. Results from this study indicate that the DEM resolution affects hydrography parameters of the delineated watershed, influence the calibration process, and the non-point and point source loadings to the streams in the watershed.
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© 2006 American Society of Civil Engineers.
History
Published online: Apr 26, 2012
ASCE Technical Topics:
- Calibration
- Discrete element method
- Engineering fundamentals
- Environmental engineering
- Hydrographs
- Hydrologic engineering
- Hydrologic models
- Hydrology
- Measurement (by type)
- Methodology (by type)
- Models (by type)
- Numerical methods
- Pollution
- River engineering
- River systems
- Simulation models
- Water and water resources
- Water pollution
- Water quality
- Water treatment
- Watersheds
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