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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 [email protected]
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