PRIMARY FLOW FEATURES1 Lopez Pass open boundary: Peak daily tidal flow >1 m/s. Highly

turbulent and well mixed. Detailed measurements will be harmonically analyzed at each tidal component so conditions can be predicted from continuous tide gage data.

2 Lopez Sound open boundary: Flows expected to be small. Similar measurement and prediction program to Lopez Pass.

3 Lopez Pass into body of Hunter Bay: Highly turbulent area with strong surface features and possibly generation of internal waves.

Primary signal is position of tidal front.

1 Rim, Ram and Rum Island channels: Three similar but different width channels driven by the same Lopez Pass currents. Each drops from the Lopez Pass plateau into deeper water with varying steepness. Expect non-hydrostatic conditions.

5 Mud bay: a shallow bay with drying flats. Expect maximum affect of surface fluxes in this area.

Lopez Island Study Area (LISA)

Washington – BC Area San Juan Islands Lopez Island

1

2

3

4

5

FACILITIES and SENSORS

HUBB: HUnter Bay Base (lab, dock, shop, TG). All data will be input to HUBB via a LISA wide wireless intranet. All sensor data and model results will be archived and posted on the LISA web site.

“RV TRACER”: 22’ SeaSport (ADCP, CTD, ES)

TG: Tide Gage

ES: Environmental Suite (wind, air, etc.)

BA: Bottom Mounted (movable) ADCPs

FC: Fixed Cameras

MB: Moored Buoy (ADCP, CTD, ES)

DB: Dynamically Positioned Buoy (ADCP, CTD, ES)

WB: Wireless Intranet Bridge

HUBB

SPERRYPENINSULA

LOPEZ SOUND

MUD BAY

HUNTER BAYBASIC FLOW AND ADCP TRACK

SURFACE FEATURES FROM FC1

CENTER I

DECATUER I

ADCP TRANSECT

CROSSTRACK

ALONGTRACK

VERTICAL

ROMS SIMULATION

LOPEZ PASSILLUSTRATIVE SAMPLES FOR FLOOD CONDITIONS

( NOT TAKEN AT THE SAME TIME OR BASED ON SAME FORCING)

SPERRY PENINSULA

Lopez Island is part of the San Juan Archipelago, at the eastern end of the Strait of Juan de Fuca, between Washington State and British Colombia. LISA is an area on the east side of Lopez Island, approximately 5X8 km, with several bays, small islands and channels. There is an energetic tidal forcing through Lopez Pass where currents exceed 1 m/s on a daily basis. Within LISA, there are distinct sites with repeatable conditions of interest including high turbulence, dissipation and mixing, non-hydrostatic flow, internal wave generation, flow separation, wetting and drying and significant tidal depth variations. Over the next several years, we intend to develop a comprehensive, long-term monitoring system for the physical oceanography at LISA using ADCPs, CTDs, tide gages and stereographic cameras. We will also implement one or more detailed numerical models, beginning with ROMS, and including data assimilation from the sensor suite. Our primary research interest is the understanding and modeling of stratified flow over topography. However, LISA will also be available for biological and other research that can benefit from a detailed knowledge of the physical environment. We expect that the new tangent linear and adjoint features of ROMS 3 will play an important role in this work, for example in sensitivity analysis and data assimilation.

PHASE I MOORED BUOY

ADCP, CTD, ENVIRONMENTAL, GPScatamaran hull, conventional

mooring

PHASE II DP BUOY

ADCP, CTD, Environmental, GPSDisk hull, Dynamic Positioning by

drift, thrusters and mooring

RV “TRACER”

ADCP, CTD, ENVIRONMENTAL, GPS22’ SeaSport, 25 knots

1km

1

2

3

44

5

TG

TG

TG

TG

ES

ES

HUBBWB

BA

BA

FC

FC

FC

FC

MB

MB

WB

DB

MB

MOBILE PLATFORMS

DB

TG

TG

HUBB

50

25

8

30

7

20

20

4

1

2

TG

1

FC

Mid-depth currents: blue to west, red to east

(Depths in Meters)

Juan de Fuca

Juan de Fuca

VictoriaWashington

Vancouver Is.

Seattle

LopezIsland

Wayne Martin UWwmartin@ocean.washington.edu

400 x 650 Gridded Bathymetry(~10 m grid)

Lopez Island

PolypropyleneHull with Batteries

and Thrusters

LISA AUTONOMOUS SURFACE VEHICLE

Vertical ProfilingSensor Package

And Anchor

Light, Flag,Antenna, GPS

and Sensors

Bumpers

Payload Container, Winch and ADCP

Tidal Height - ft

Current Speed in Lopez Pass – m/s

FORCING THIS WEEK

WINCH: Precise up/down control,no slip rings, any size cable

BAT BAT

INSTRUMENT BOX: Laptop, Watch Dog Timer, 8 Port USB/RS232, Weather I/F, RF Modem, Control I/O

ADCP: CurrentVelocities, Back Scatter, Heading, Pitch, Roll

Catamaran Hulls(Old Hobicat)

WINCH: Precise up/down control,no slip rings, any size cable

Profiling CDT and other Instruments

Meteorological Sensors,Light, and Antenna

LISA Prototype Profiling Buoy

4 Point Mooring

Estimated Cost w/oSensors: $5000with Baseline Sensors: $20000