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Sediment in the Trinity River Basin

Sediment in the Trinity River Basin. Virginia Smith CE397 – Spring 2009. Outline. The Trinity River Basin Sediment Data Trends of the Main Channel Trends of the Catchments Conclusions. The Trinity River Basin. Large population and growing Lots of agriculture

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Sediment in the Trinity River Basin

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  1. Sediment in the Trinity River Basin Virginia Smith CE397 – Spring 2009 Virginia Smith CE 397

  2. Outline • The Trinity River Basin • Sediment Data • Trends of the Main Channel • Trends of the Catchments • Conclusions Virginia Smith CE 397

  3. The Trinity River Basin • Large population and growing • Lots of agriculture • 80-90% of the basin’s water supply is from surface water • 28 water supply reservoirs • The first was in 1911 • The master planning has 13 remaining reservoirs to built Virginia Smith CE 397

  4. Sediment Data in the Basin Virginia Smith CE 397

  5. Classifying the Gages Virginia Smith CE 397

  6. Mainstream Sediment Gages Virginia Smith CE 397

  7. Sediment Rating Curves Virginia Smith CE 397

  8. Dam Influence Virginia Smith CE 397

  9. Dam Influence Virginia Smith CE 397

  10. Catchment Sediment Gages Virginia Smith CE 397

  11. Virginia Smith CE 397

  12. Virginia Smith CE 397

  13. Delineating Catchments Virginia Smith CE 397

  14. Natural Regions Virginia Smith CE 397

  15. Land Cover Virginia Smith CE 397

  16. Data Attached to Counties Virginia Smith CE 397

  17. Regression • Variables Collected • Hill slope • Storm Depth • Vegetation Density • Precipitation • Precipitation Intensity • Urban Land • Agricultural Land • Forested Land • Variance Inflation Factors Virginia Smith CE 397

  18. Correlation • Precipitation / Precipitation Intensity / Vegetation Cover Density • Hill slope/Erosion Rate • Agriculture and Forest Land Virginia Smith CE 397

  19. Regression • SAS • Conc. = Hill slope*(5.16) t=5.16 R2=0.792 p-value = 0.0013 F = 26.65 • Excel matched the results of SAS Virginia Smith CE 397

  20. Conclusions • Sediment Rating Curves: a greater slope means a higher concentration • Dams have influenced the transport of sediment in the main channel • Hill slope is the main influence of sediment in the Trinity River Basin Virginia Smith CE 397

  21. Questions Virginia Smith CE 397

  22. Mainstream Flow Duration Curves Virginia Smith CE 397

  23. SAS Regression Data Virginia Smith CE 397

  24. Excel Regression Data Virginia Smith CE 397

  25. Storm DepthData • Storm Depth • Rainfall depth during a storm • L moment statistics • Based on hourly rainfall during the storm duration • Data • Data by county • Data in inches Virginia Smith CE 397

  26. Correlation Virginia Smith CE 397

  27. NCRS Dams Virginia Smith CE 397

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