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 High-resolution sediment dynamics in a salt-wedge estuary
14
Embed
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. - PowerPoint PPT Presentation
This document is posted to help you gain knowledge. Please leave a comment to let me know what you think about it! Share it to your friends and learn new things together.
Transcript
Philip Orton, Doug Wilson, David Jay, Annika FainOregon Graduate Institute, Environmental Science & Engineering
Funded by The National Science Foundation LMER project
Sediment analyses by Denise Reed at U. New Orleans
High-resolution sediment dynamics in a salt-wedge
estuary
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, t=20 sec
– OBS: CTD-OBS profiles, t=30 min
– Concentration (C), t=2 hrs
– Settling rate (Ws), t=2 hrs
– Zooplankton, primary productivity, etc
5
Anchor Station Observations, Ebb Tide
6
INVERSE
ANALYSES
Inverse Analysis Approach
7
Inverse Analysis: ABS Stage I
8
Inverse Analysis: OBS Stage I
9
Theoretical Responses
10
OBS response coeff. : ABS response coeff.
Inverse Analysis Stage II
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