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Nutrient Loading in Coastal Streams, Variation with Land Use in the Carpinteria Valley

Nutrient Loading in Coastal Streams, Variation with Land Use in the Carpinteria Valley. Timothy H. Robinson Bren School of Environmental Science and Management University of California Santa Barbara. Introductions. Overview. Creeks of the Carpinteria Valley:. Arroyo Paredon

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Nutrient Loading in Coastal Streams, Variation with Land Use in the Carpinteria Valley

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  1. Nutrient Loading in Coastal Streams, Variation with Land Use in the Carpinteria Valley Timothy H. Robinson Bren School of Environmental Science and Management University of California Santa Barbara

  2. Introductions

  3. Overview Creeks of the Carpinteria Valley: • Arroyo Paredon • CSM North Tributaries • Santa Monica • Franklin • Carpinteria/Gobernador • Lagunitas My research project: • Nutrient export • Modeling • Predictions

  4. Methodology Identify land use classes and sampling site locations: Chaparral/Forest, Avocado, Greenhouse, Open-Field Nursery, Residential and Commercial Sampling strategies: Subcatchment, point discharge and above-below Sampling methods: Manual sample or ISCO auto-sampler GIS database development Data analysis Nutrient flux calculation (hydrology and stream chemistry) Nutrient export coefficient model development Integration with an urban growth model

  5. Sampling Site Locations

  6. Measuring Nutrient Concentrations Grab samples and ISCO auto- samplers

  7. Specifics: Analyzing for: Ammonium (NH4+), Nitrate (NO3-), Total Dissolve Nitrogen (TDN), Phosphate (PO43-), Total Particulate Carbon (TPC), Total Particulate Nitrogen (TPN), Total Particulate Phosphate (TPP), Total Suspended Sediments (TSS) and major ions at selected locations • Frequency: • Regular sampling: • Once every 2 weeks during the dry season • Once a week during the wet season • Storm sampling: • Every hour on the rising limb of the hydrograph • Every 2-4 hours on the falling limb of the hydrograph Project duration: WY2001, WY2002 and WY2003

  8. Measuring Stream Flow Staff Gauges and Pressure Transducers Surveying the Cross-Sections Developing Rating Curves

  9. Stream Chemistry and Hydrology Carpinteria Creek (WY-2002)

  10. 10000 baseflow stormflow 1000 100 nitrate (µM) 10 1 Franklin Carpinteria Santa Monica 100 baseflow stormflow 10 phosphate (µM) 1 Franklin Carpinteria Santa Monica General Trends in Nutrient Concentrations by Watershed

  11. Nutrient Loading Development of a Nutrient Flux Model Stream Chemistry Observed Stage PT Stage (5-min) Stage-Discharge Relationship (HEC-RAS) Stream Chemistry Observed Flow PT Flow (5-min) Flow (hourly) Stream Chemistry (hourly) Observed Flow (hourly) Flow (hourly) Identify: Baseflow, Peakflow.. Nut. Conc. Stream Chemistry (model/obs) Flow (hourly) Linear extrapolation Annual Nutrient Loading Nut. Flux (conc/flow)

  12. Cumulative Nutrient ExportFranklin Creek Watershed WY 2001

  13. Cumulative Nitrate ExportNursery Site

  14. WY2001 Basin Outlet Mass Flux WY 2001

  15. Comparison of Flux afterNormalizing with Runoff

  16. S+P +ASMC Nutrient Export Coefficient Model E A GIS Datm LTER Datm Literature I Interview I Literature K Literature L k t D/V a LU GIS • Abbreviation key: • E – Export Coefficient Function • B – Watershed Response Variable • S – Soils • P - Precipitation • ASMC – Antecedent Soil Moisture Content • K – Down Stream Distance-Decay Function • k + a – Coefficients • t – Time • D – Distance Traveled Downstream • V – Average Velocity Traveled • Downstream

  17. Integration with an Urban Growth Model (SLEUTH) • SLEUTH : an urban growth model implemented for the Santa Barbara area that predicts future land use, example 2050 • Enables comparison of future loadings to standards being set for stream water quality regulations (TMDLs) • Evaluation of proposed BMP mitigations

  18. Significance of the Project • Presentations: • PhD Seminar, Bren School UCSB • Santa Barbara Coastal LTER Seminar, UCSB • University of California Toxic Substances Research & Teaching • Program, Annual Symposium, Long Beach • Coastal Water Resources, American Water Resources • Association 2002 Spring Conference, New Orleans • Southern California Wetlands Recovery Project, 2002 • Symposium, Ventura • California and the Worlds Oceans 02 Conference, Santa Barbara

  19. Questions Thank you!!

  20. Sampling Teams • Three teams sampling in and around storm events • Lower reach sites • Upper reach sites • Restricted sites

  21. Percentage Land Use Class by Land Use Sub-Area

  22. Santa Monica Debris Basin

  23. Gobernador Debris Basin

  24. SM05 Chaparral/Forest Sites CP05 GB05

  25. Residential Site(CP30)

  26. Commercial Site(CP20)

  27. Greenhouse Site

  28. Nursery Site(FK06+FK07)

  29. Getting to Know Your Local Streams

  30. Carpinteria Creek (first storm) CP00 – outlet CP20 – commercial CP30 – residential GB04 – chaparral/ forest

  31. Franklin Creek (first storm)

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