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High-resolution sediment dynamics in a salt-wedge estuary

High-resolution sediment dynamics in a salt-wedge estuary. Philip Orton, Doug Wilson, David Jay, Annika Fain Oregon Graduate Institute, Environmental Science & Engineering Funded by The National Science Foundation LMER project Sediment analyses by Denise Reed at U. New Orleans. Summary.

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High-resolution sediment dynamics in a salt-wedge estuary

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  1. High-resolution sediment dynamics in a salt-wedge estuary Philip Orton, Doug Wilson, David Jay, Annika Fain Oregon Graduate Institute, Environmental Science & Engineering Funded by The National Science Foundation LMER project Sediment analyses by Denise Reed at U. New Orleans

  2. Summary • Inverse analysis: optical and acoustical SPM • Several advantages • detection of wide range of sediment sizes • concentrations by settling velocity (Ws) classes • high-resolution compared to tidal timescales • Fraser River estuary - erosion thresholds, resuspension mechanisms

  3. Fraser River estuary, July ‘99

  4. Field Measurements • R/V Sproul - 1999 anchor stations • ABS: 300 kHz BB-ADCP, Dt=20 sec • OBS: CTD-OBS profiles, Dt=30 min • Concentration(C), Dt=2 hrs • Settling rate (Ws), Dt=2 hrs • Zooplankton, primary productivity, etc

  5. Anchor Station Observations, Ebb Tide

  6. Inverse Analysis Approach A N A L Y S E S I N V E R S E

  7. Inverse Analysis: ABS Stage I

  8. Inverse Analysis: OBS Stage I

  9. Theoretical Responses

  10. Inverse Analysis Stage II G : OBS response coeff. g : ABS response coeff.

  11. Response-Modified Acoustic C at 1 m

  12. Response-Modified Acoustic C at 1 m

  13. Future Analyses • Wealth of data from the Columbia River estuary and the Fraser River estuary • Multi-frequency acoustics • For 2000, LISST particle size observations • Modify approach to include advection • Sensitivity analyses are critical

  14. Fraser 1999 Conclusions • Joint acoustic/optic approach invaluable due to wide range of sediment types • IA allows us to... • study sediment erosion, transport by Ws-class • achieve resolution not available with conventional sediment monitoring tools

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