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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.

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Descriptive Columbia River estuary and plume II

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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

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


Salinity intrusion

Salinity (psu)

Tide range (m)

Q (m3/s)

am169


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


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.


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


Salinity intrusion length

Responsive

SIL has a clear response to river discharge …


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)


Freshwater diatoms?

Slide by Charles Seaton


Oceanic and freshwater diatoms?

Oceanic diatoms

Freshwater diatoms

Slide by Charles Seaton


Myrionecta rubra?

Slide by Charles Seaton


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


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


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


Why do we see surface signatures of internal waves?

Internal waves

Slide by Jiayi Pan


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


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


Internal waves in Columbia River estuary (CRE)

Characteristics of internal waves in the CR

Slide by Jiayi Pan


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


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