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Quantifying the Effects of Land Use Change and Population on Water Quality

Quantifying the Effects of Land Use Change and Population on Water Quality. Mark Dougherty Civil & Environmental Engineering Virginia Tech 26 October, 2001. Objectives. Quantify how changes in land use and population impact water quality in a watershed

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Quantifying the Effects of Land Use Change and Population on Water Quality

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  1. Quantifying the Effects of Land Use Change and Population on Water Quality Mark Dougherty Civil & Environmental Engineering Virginia Tech 26 October, 2001

  2. Objectives • Quantify how changes in land use and population impact water quality in a watershed • Develop a methodology for estimating the impact of future land use and population on water quality

  3. Plan of Attack • Relevant literature review • Consolidate available data • Investigate relationships with land use, population, and water quality • Calibrate/verify water quality model(s) • Develop future land use/population scenarios • Compare model predictions with statistical methods (trend, correlation, regression analyses)

  4. Literature Review Topics • Previous studies in the basin • Water quality impacts of urbanizing areas • Land use analysis techniques • GIS and watershed analysis • Statistical analysis of water resources • Water quality models

  5. Land Use Data • Aerial photography and DOQQ’s • Existing maps from regional agencies • Remotely sensed imagery • Products from RESAC or Univ. of MD • Data developed directly from acquired imagery

  6. Proposed water quality parameters • BOD5 • Total suspended solids • Total phosphorus • Total Kjeldahl nitrogen • Ammonia nitrogen • Oxidized nitrogen

  7. Issues and challenges with this research • Large quantities of data need to be summarized in a meaningful manner • Statistical analyses must account for spatial distribution of land uses within the watershed • Water quality data is available from only one monitoring station • Remotely sensed imagery or products may become costly

  8. Occoquan Reservoir

  9. Landsat 7 land cover map Chesapeake Bay watershed Occoquan Dam Source: Mid-Atlantic Regional Earth Science Applications Center (RESAC), 1998

  10. Occoquan Basin 1985 Land Use Map Rt.50 Rt.234 I-66 Rt.234 Rt.28 Source: NVRC

  11. Cub Run Subwatershed1985 Land Use Map

  12. Cub Run Subwatershed1995 Land Use Map Source: NVRC

  13. Have a nice day. I hope you enjoyed the show!

  14. Urban change detection (Masek et al., 2000)

  15. Urban sprawl regression (Masek et al., 2000)

  16. Example of building encroachment on stream buffer Source: RESAC

  17. Example of forest buffering of agricultural land Source: RESAC

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