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

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Presentation transcript:

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

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

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 3 Virginia Smith CE 397

Sediment Data in the Basin 4 Virginia Smith CE 397

Classifying the Gages 5 Virginia Smith CE 397

Mainstream Sediment Gages 6 Virginia Smith CE 397

Sediment Rating Curves 7 Virginia Smith CE 397

Dam Influence 8 Virginia Smith CE 397

Dam Influence 9 Virginia Smith CE 397

Catchment Sediment Gages 10 Virginia Smith CE 397

11Virginia Smith CE 397

12 Virginia Smith CE 397

Delineating Catchments 13 Virginia Smith CE 397

Natural Regions 14 Virginia Smith CE 397

Land Cover 15 Virginia Smith CE 397

Data Attached to Counties 16 Virginia Smith CE 397

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

Correlation Precipitation / Precipitation Intensity / Vegetation Cover Density Hill slope/Erosion Rate Agriculture and Forest Land 18 Virginia Smith CE 397 HillslopeAvg Flood DepthErosionsVegetationPrecipitationPrecip IntensityUrbanAgricultureForest Hillslope1 Average Flood Depth Erosions (Tons/year) Vegetation Cover Density Precipitation (mm/month) Precipitation Intensity (mm/month) Urban Agriculture Forest

Regression SAS Conc. = Hill slope*(5.16) t=5.16 R 2 =0.792 p-value = F = Excel matched the results of SAS 19 Virginia Smith CE 397

Conclusions Virginia Smith CE 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

Questions Virginia Smith CE

Mainstream Flow Duration Curves 22 Virginia Smith CE 397

SAS Regression Data Virginia Smith CE

Excel Regression Data Virginia Smith CE SUMMARY OUTPUT Regression Statistics Multiple R R Square Adjusted R Square Standard Error Observations8 ANOVA dfSSMSF Significan ce F Regression Residual Total Coefficien ts Standard Errort StatP-value Lower 95% Upper 95% Lower 95.0% Upper 95.0% Intercept0#N/A Hillslope

Storm DepthData Virginia Smith CE 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

Correlation Virginia Smith CE Spearmans Rho HillslopeAvg Flood DepthErosionsVegetationPrecipitationPrecip IntensityUrbanAgricultureForest Hillslope1 Average Flood Depth Erosions (Tons/year) Vegetation Cover Density Precipitation (mm/month) Precipitation Intensity (mm/month) Urban Agriculture Forest Kendall's Tau HillslopeAvg Flood DepthErosionsVegetationPrecipitationPrecip IntensityUrbanAgricultureForest Hillslope1 Average Flood Depth Erosions (Tons/year) Vegetation Cover Density Precipitation (mm/month) Precipitation Intensity (mm/month) Urban Agriculture Forest

NCRS Dams 27 Virginia Smith CE 397

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