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Comparison of Sediment Loading and Non-Point Source Pollution in the Mission and Aransas Rivers

This research aims to compare sediment loading and non-point source pollution in the Mission and Aransas Rivers, analyzing land cover, nitrogen, phosphorus, lead, and zinc levels to assess pollution and sediment accumulation downstream. Data sources include NHDPlus, Catchments, and more. Predictions indicate higher nitrogen and sediment in Aransas due to high-intensity development, while Mission has lower pollutants due to forests and grasslands. Future work includes adding lead, zinc, and phosphorus measurements and comparing with acceptable thresholds.

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Comparison of Sediment Loading and Non-Point Source Pollution in the Mission and Aransas Rivers

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  1. Comparison of Sediment Loading and Non-Point Source Pollution in the Mission and Aransas Rivers Jena R. Campbell Department of Marine Sciences November 29, 2007

  2. Mission-Aransas NERR • 30 miles NE of Corpus Christi • 27th Reserve • Designated May 3, 2006 • Only one in Western Gulf of Mexico • Area for research in a natural setting • UTMSI lead State Agency • Mission River • Mission Bay • Aransas River • Copano Bay http://www.utmsi.utexas.edu/nerr/index.htm

  3. Study Area – Mission & Aransas Rivers

  4. Purpose • Original idea – too ambitious • Compare between Mission and Aransas Rivers • Land Cover • Sediment Loading • Nitrogen • Phosphorus • Lead • Zinc • Pollution & Sediment accumulation downstream

  5. Data Sources • Exercise 5 • NHDPlus • Catchments • Flowlines • National Land Cover Data Set • Hydroseek

  6. Catchment & Flowline Relationships

  7. High Intensity Development Aransas Catchments Mission Catchments

  8. Row Crops Aransas Catchments Mission Catchments

  9. Deciduous Forests Aransas Catchments Mission Catchments

  10. Grassland Aransas Catchments Mission Catchments

  11. Predictions • Aransas River • More Nitrogen • More Sediment • Reason – land cover (agriculture, high intensity) • Mission River • Less Pollutants • Less Sediment • Reason – land cover (forests, grassland)

  12. Hydroseek Measurements - Nitrogen

  13. Hydroseek Measurements – Unfiltered Residues

  14. Future Work • Add lead, zinc, and phosphorus measurements to the map • Sediment and pollutant accumulation farthest downstream • Make concentration grid based on the run-off in each catchment • Exercise from 2005 • Compare actual measurements to acceptable thresholds

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