GIS-Hydro Database for Tres Palacios Bay - PowerPoint PPT Presentation

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GIS-Hydro Database for Tres Palacios Bay

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  1. GIS-Hydro Database for Tres Palacios Bay Stephanie Johnson GIS in Water Resources Class Presentation November 21, 2006 Dr. David Maidment – Advisor UT - Center for Research in Water Resources (CRWR)

  2. Study Area

  3. Tres Palacios Bay • Determined to not meet dissolved oxygen standards of 5 mg/L • TCEQ begins a dissolved oxygen TMDL study • Overseen by Dr. Paul Montagna, Texas A&M Corpus Christi • Water quality monitoring for the past 2 years • UT-CRWR asked to help with water quality modeling

  4. Objective of Project • Develop a GIS-based dataset for future water quality modeling • Introductory qualitative analysis of monitoring data • Use as a test for webscraper tool that calculates duration curves

  5. Dataset Roads/Cities Soils • Base map – used as a guide • Developed by Sally Morehead, M.S. at UT-Austin Marine Science Institute for initial efforts in study • Hydrography • Tyler Jantzen at CRWR - NHDPlus data • Jantzen is supported by TNRIS to develop TX NHDPlus Data for his M.S. thesis • General data • Texas General Land Office (GLO) – Political boundaries, roads, etc. • Federal agencies – NRCS soil and landuse, etc. • Local data sources • TCEQ – Water quality monitoring stations • Dr. Paul Montagna – water quality monitoring points in Tres Palacios Bay

  6. Tres Palacios Bay Watershed

  7. 1 USGS flow gage on the Tres Palacios River 27 TCEQ TRACS river monitoring points 4 monitoring points in Tres Palacios Bay 17 TCEQ TRACS monitoring points in Tres Palacios Bay Monitoring Points

  8. Qualitative Analysis • Patterns in low D.O. levels • Location • Time of year • Natural events (flow regime) • Theorize potential sources of pollution • Non-point vs. point • Municipal vs. rural (Yet to be completed)

  9. Load Duration Curve • Basically a cumulative frequency distribution • Derived from a flow duration curve • Multiply flow duration curve by the desired pollutant concentration and a conversion factor • Outcome: allowable load/day

  10. Example Low Flow High Flow Applying the water quality standard of 0.05 mg/L TP: Source: White Paper (1): Advantages and Disadvantages of Using Load Duration Curves to Estimate Existing and Allowable Loads for the Development of Nutrient TMDLs

  11. Webscraper for Duration Curve Creation

  12. Raw Data

  13. Calculations

  14. Calculations (cont.)

  15. Future Work • For GIS Project • Qualitative analysis of monitoring data • Create more duration curves for Tres Palacios River • Future Modeling • Use data to develop a dissolved oxygen water quality model • Use runoff and land use data to determine the nutrient load from each catchment • Create duration curves for non-point source nutrient loads

  16. Credits • Thanks to: Dr. David Maidment, Tyler Jantzen, Dr. Paul Montagna, Ernest To, Sally Morehead, CRWR staff Photos from: http://www.portofpalacios.com

  17. Questions?