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The Utility of Spatially Explicit Parameters in Phosphorus Water Quality Monitoring

The Utility of Spatially Explicit Parameters in Phosphorus Water Quality Monitoring. Graduate Student: Mark Breunig Graduate Advisor: Dr. Paul McGinley. PRESENTATION OVERVIEW. Background Information Objectives Methods Discussion. PRESENTATION OVERVIEW. Background Information

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The Utility of Spatially Explicit Parameters in Phosphorus Water Quality Monitoring

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  1. The Utility of Spatially Explicit Parameters in Phosphorus Water Quality Monitoring Graduate Student: Mark Breunig Graduate Advisor: Dr. Paul McGinley

  2. PRESENTATION OVERVIEW Background Information Objectives Methods Discussion

  3. PRESENTATION OVERVIEW Background Information Objectives Methods Discussion

  4. PHOSPHORUS Eutrophication …Models, Legislation

  5. R2 = 43% p < 0.001 2001 – 157 sites 2002 – 78 sites 2003 – 5 sites Total: 240 sites

  6. PHOSPHORUS Although efforts are underway to set stream standards in Wisconsin and elsewhere, there is still controversy regarding the mechanisms that control stream phosphorous concentrations. This represents a collective misunderstanding of the fundamental processes that control water quality at the catchment scale (Boomer et al. 2008).

  7. spatially explicit… WHAT?

  8. 27% Land Use X

  9. 27% Land Use X

  10. spatially explicit parameters… the location of landscape features within a watershed is significant -why?- flow path characteristics are a “driving factor” in this process

  11. flow path characteristics surface overland flow only • distance • time • topography • connectivity • run-on – cumulative effects?

  12. PRESENTATION OVERVIEW Background Information Objectives Methods Discussion

  13. Objectives • Derive spatially explicit parameters • Demonstrate the utility of spatially explicit parameters

  14. PRESENTATION OVERVIEW Background Information Objectives Methods Discussion

  15. Methods Asses the utility of spatial parameters by… • attempting to improve explained variation in observed data set • observed data set => over 200 sites across Wisconsin • wade-able streams • fixed monthly summer sampling • Source: USGS

  16. R2 = 43% p < 0.001 2001 – 157 sites 2002 – 78 sites 2003 – 5 sites Total: 240 sites

  17. Methods Details of data management • 30m DEM - USGS • 30m 2001 NALCD – USGS • SSURGO (feature) – NRCS • Robertson Watersheds • Sampling Locations • Raw Data – Water Quality Results

  18. Methods Details of data management OPERATION SSURGO Visual Basic/Arc Objects: For each county in Wisconsin 1.Query SSURGO database 2.Export query results as table 3.Join table to shapefile 4.Shapefile to 30m raster Next

  19. Methods Details of data management OPERATION FLOWPATH Visual Basic/Arc Objects: For each pixel in watershed Calculate spatially explicit metric along flowpath Next

  20. PRESENTATION OVERVIEW Background Information Objectives Methods Discussion

  21. Pixel Value (proportion – no units) Σ(eFLag* β) Σ(eFLall* β)

  22. Potential Barriers In Recognizing Signal • SPATIAL SCALE • TEMPORAL SCALE • MATHMATICS • WATER QUALITY METRIC • BOUNDARY DELINEATION • RANDOMNESS

  23. SPATIAL SCALE

  24. s Field-Scale vs. Basin-Scale Do remotely sensed basin-scale observations adequately represent surface overland flow paths? *snap plus *micro-topology …sometimes

  25. Resolution Is 30m resolution enough? pixel

  26. TEMPORAL SCALE

  27. Properly Considering Time Is it appropriate to model surface overland flow path characteristics as a “long-term annual average” or must the time step be smaller? *wet years/dry years *variations in rainfall distribution *hour/minute time step– saturated areas

  28. MATHMATICS

  29. SUMMARY STATISTICS What is the best way of summarizing flow path characteristics for thousands of pixels – measures of central tendency?

  30. WATER QUALITY METRIC

  31. BOUNDARY DELINEATION

  32. 27% Land Use X

  33. 27% of “Watershed” not contributing but… % LU changes only 1% RANDOM SPATIAL CONFIGURATION?

  34. HYDROLOGIC CONNECTIVITY Can the utility of spatially explicit parameters be demonstrated without accurately modeling hydrologic connectivity?

  35. …Continued efforts generate a suite of spatially explicit parameters test utility of parameters

  36. The Utility of Spatially Explicit Parameters in Phosphorus Water Quality Monitoring Graduate Student: Mark Breunig Graduate Advisor: Dr. Paul McGinley

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