ADCP-Based Determination of Directional Wave Spectra in the

York River Estuary

John Brubaker, Lorraine BrasseurCarl Friedrichs, Todd Nelson, Don Wright

QARTOD II, February 28 – March 2, 2005

Outline• VIMS Observing system overview

– The context in which wave data will be provided.– Use observing system to develop/test wave data

sampling and QA/QC

• Preliminary wave analyses– Hurricane Isabel deployment– ADCP/AWAC deployment

• Addressing challenges of small-amplitude, short-period waves

Global to Local Observing Programs

• Global: GOOS=Global Ocean Observing System– National: IOOS=Integrated Ocean O S

• Regional: MACOORA=Mid-Atlantic Coastal Ocean Observing Regional Association

- Sub-regional: CBOS=Chesapeake Bay O S- Local: VIMS Observing System- Local: U. Md.- Local: ODU- Local: more!

Blue = proposed

• platforms• power• communications• sensors/cameras• control/coordination

DODS server

• Met data wind, air temp…• ADCP current• ADCP waves• Water quality temp, salinity…

System overview with respect to DODS/OPeNDAP

• Camera imagesinternet

Matlab• command line• GUI

Observing system web site, portal

Models

Data analysis

OPeNDAP Data Connector

Direct URL entry into browser

Note: some data is internet accessible with and without DODS.

Outline• VIMS Observing system overview

– The context in which wave data will be provided.– Use observing system to develop/test wave data

sampling and QA/QC

• Preliminary wave analyses– Hurricane Isabel deployment– ADCP/AWAC deployment

• Addressing challenges of small-amplitude, short-period waves

Outline• VIMS Observing system overview

– The context in which wave data will be provided.– Use observing system to develop/test wave data

sampling and QA/QC

• Preliminary wave analyses– Hurricane Isabel deployment– ADCP/AWAC deployment

• Addressing challenges of small-amplitude, short-period waves

Initial problems when processing with default parameters

Sensitivity to processing parameters—further work underway

Transition

• Phase I: Emerging observing system– Waves on back burner– 600 kHz ADCP– Opportunistic deployments– Results promising, interesting, need work

• Phase II: Obs sys infrastructure in place– 1200 kHz ADCP (also plan to acquire AWAC)– Systematic trials for wave data– Need to identify basic QA/QC acceptance criteria

Outline• VIMS Observing system overview

– The context in which wave data will be provided.– Use observing system to develop/test wave data

sampling and QA/QC

• Preliminary wave analyses– Hurricane Isabel deployment– ADCP/AWAC deployment

• Addressing challenges of small-amplitude, short-period waves

Working with vendor, refine post-collection processing

Exploit observing system as development environment

• Rapid, efficient trials with different (existing) command configurations.

• In situ development of new data acquisition modes.

• Independent wave information, initially from images.

VIMS humans RDIftp, email, phone

Cameras are mounted on buoyand on pier piling.

Conclusions

• In estuaries, wave data from acoustic profilers is highly desirable– Relatively secure on bottom– Along with waves, get currents, backscatter

profile, turbulence, water level

• State of the art inadequate for specification of QA/QC criteria

• Outlook is promising• Observing system infrastructure can facilitate

progress