1 / 19

Descriptive Columbia River estuary and plume II

Descriptive Columbia River estuary and plume II. EBS566: Estuary and Ocean Systems II – Lecture 6, Winter 2010 Instructors: T. Peterson, M. Haygood, A. Baptista Division of Environmental and Biomolecular Systems, Oregon Health & Science University. Plume regions.

galena-hanson
Download Presentation

Descriptive Columbia River estuary and plume II

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Descriptive Columbia River estuary and plume II EBS566: Estuary and Ocean Systems II – Lecture 6, Winter 2010 Instructors: T. Peterson, M. Haygood, A. Baptista Division of Environmental and Biomolecular Systems, Oregon Health & Science University

  2. Plume regions Summary by David Jay of research by A. Horner-Devine et al.

  3. Salinity intrusion Salinity (psu) Tide range (m) Q (m3/s) am169

  4. Biology in context? Oceanic diatoms • Riverine phytoplankton: washed down river, lyse in saline water • Myrionectarubra: develops blooms within the estuary, mobile • Oceanic diatoms: washed into the estuary, generally tolerant of low salinity water Freshwater diatoms Myrionecta rubra Slide by Charles Seaton

  5. Internal waves A SAR image taken at 01:56:27 GMT, July 8, 2007 showing the surface roughness as a manifestation of IWs in the Columbia River estuary Spatial coverage of the radar from the bridge (right) to the river mouth (left) (background courtesy of Google Earth). The red rectangle shows the approximate location of the internal waves. Middle: Photo of the internal waves taken from the deck of the R/V Pt. Sur at 1600 PDT on September 8, 2009 (courtesy of Craig McNeil). Bottom: image produced from radar data showing the internal waves at 1740 PDT on the same day. The intensity [dB (100V)2] is related to internal wave amplitude while the spacing indicates wavelength.

  6. Salinity intrusion length (a) Data collected by David Jay on LMER and NOAA cruises Chawla, Jay, Baptista, Wilkin and Seaton, CSR 2008 Predicable (with some challenges) (b) Salinity in psu at an upstream station (data in red, model in black, blue and magenta) 6.8 0.0 Aug 26, 2004 27 28 29 30 31 Sep 1 2

  7. Salinity intrusion length Responsive SIL has a clear response to river discharge …

  8. Salinity intrusion length Responsive … relatively easy to characterize (“noise” is useful to characterize other influences) SIL2psu ≈ 5.949Q-0.288 r2=0.823 SIL (Km) Based on DB16 River discharge, Q (m3/s)

  9. Freshwater diatoms? Slide by Charles Seaton

  10. Oceanic and freshwater diatoms? Oceanic diatoms Freshwater diatoms Slide by Charles Seaton

  11. Myrionecta rubra? Slide by Charles Seaton

  12. What are internal waves Internal waves are gravity waves that oscillate within, rather than on the surface of, a water body in association with a stratified fluid in motion Slide by Jiayi Pan

  13. How are estuarine internal waves generated in the CR? U CRE bottom topography is a key factor for generation of internal waves Internal waves 25 m 2 km Lee wave is the generation mechanism Flood tide current interacts with the bottom topography to generate internal waves Slide by Jiayi Pan

  14. Internal waves in Columbia River estuary (CRE) Why are estuarine internal waves important in the CR? Internal waves can cause vertical velocity shear, which can intensify vertical mixing process Not a representation of the CR Through vertical mixing in the North Channel, internal waves may be quite important for the ecology of the Columbia River Estuary (CRE). In particular, internal waves may substantially modulate ocean influences, which are felt predominantly through the North Channel Slide by Jiayi Pan

  15. Why do we see surface signatures of internal waves? Internal waves Slide by Jiayi Pan

  16. Internal waves in Columbia River estuary (CRE) Can we see internal waves in fixed station records ? am12 ADCP U velocity ( Saturn 01 Location) am12 ADCP U velocity horizontal Velocity (east-west) Tides dominate After removing tidal signals U velocity Tidal Residual horizontal velocity Internal waves Internal waves Slide by Jiayi Pan

  17. Characteristics of internal waves in the CR The statistics of CRE internal waves from 10 SAR images showing internal waves There are 107 waves in these images Wavelength distribution Statistical Results of the wavelength Slide by Jiayi Pan

  18. Internal waves in Columbia River estuary (CRE) Characteristics of internal waves in the CR Slide by Jiayi Pan

  19. Early modeling x=31 x=31.5 x=32 x=32.5 x=33 x=33.5 x=34 x=34.5 x=35 x=35.5 x=36 x=36.5 x=37 x=37.5 x=38 x=38.5 S t (hours) Credit: Joseph Zhang

More Related