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Tower System Design


General Information

  • Satellite and HF Radio communications
  • Low-level wind profiler up to 200m above platform level
  • ASIMET Meteorological sensors suite including wind speed and direction, air temperature, air pressure, precipitation, and solar radiation
  • Water temperature and salinity near the surface, mid-depth and bottom of the water column
  • Water speed and direction throughout the water column
  • Wave height, period and direction
  • Scalable charging system to meet computer, sensor, and communication needs

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Figure 1. T23 ("C") Tower, ~15 nm offshore from Oregon Inlet, Nags Head, NC.

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Figure 2. SCINTEC Low-Level Wind Profiler

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Figure 3. Redundant Anemometers with lightening protection circuits at top of tower truss.

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Figure 4. Anemometer frame fixed to deck of tower truss with analog-to-digital converter, serial connection at instrument to main system computer in Figure 5.

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Figure 5. Tower Metereological System -- Rain Gauge, Barometer, Temperature/Humidity, Long- and Short-wave radiation sensors are located next to main enclosure and solar panels. The acquisition computer, communications, and power distribution are located in the main enclosure.

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Figure 6.


Power

  • Up to six (6) 12 V Sun-Xtender PVX-1080T Sealed Solar Batteries
  • Up to four (4) 125 Watt Kyocera KC-Series Solar Panels
  • Outback Power Systems MX60 Charge Controller
  • Xantrex Link10 Power Monitor
  • Optional Sunwiz Tech Wind Generator

Parameters

Table 1. Wind Profiler Data ASCII Example

Store binary, log and ascii data on Scintec Computer every 30 minutes. For realtime transmission grab the day's ascii file every hour. Daily binary file trasmitted once per day.
Main Data
#
# variable definitions
#
height # z # m # Z1 # 0 # 99999
wind speed # speed # m/s # G1 # 0 # 99.99
wind direction # dir # deg # R1 # 0 # 999.9
wind W # W # m/s # S # 0 # 99.99
sigma W # sigW # m/s # S # 0 # 99.99
backscatter # bck #  # S # 0 # 9.99E+37
error code # - - - - - - - - groundclutter - - - - - - -  #  # E # IIIIIIIIWIIIIIII
#
# beginning of data block
#

2009-07-07 00:30:00 00:30:00
#   z  speed    dir      W   sigW       bck   error 
   10  99.99  999.9   0.04   0.53  3.99E+02       0
   15   2.12   91.6   0.06   0.26  4.71E+02     256
   20   2.83   79.8   0.00   0.25  4.48E+02     256
   25   3.24   77.3  -0.11   0.24  4.94E+02     256
   30   3.89   82.3  -0.09   0.23  7.25E+03     256
   35   4.93   79.3  -0.12   0.24  7.06E+03     256
   40   4.96   74.6  -0.10   0.21  1.24E+04       0
   45   4.93   72.8  -0.08   0.19  1.33E+04       0
   50   5.06   72.7  -0.08   0.26  1.31E+04       0
   55   4.97   74.1  -0.05   0.27  1.57E+04     256
   60   5.16   74.3  -0.03   0.26  1.73E+04       0
   65   5.30   75.2  -0.01   0.25  1.90E+04     256
   70   5.46   75.1  -0.02   0.27  1.71E+04       0
   75   5.54   75.7  -0.03   0.30  1.88E+04       0
   80   5.66   76.3  -0.04   0.23  1.78E+04       0
   85   5.90   77.2  -0.04   0.21  1.87E+04       0
   90   6.10   77.4  -0.06   0.31  1.92E+04       0
   95   6.24   76.6  -0.07   0.30  1.86E+04       0
  100   6.23   77.1  -0.09   0.26  1.82E+04       0
  105   6.14   77.3  -0.09   0.31  9.99E+37       0
  110   6.21   78.4  -0.09   0.24  2.18E+04       0
  115   6.19   77.8  -0.08   0.36  9.99E+37       0
  120   6.53   78.6  -0.09   0.35  9.99E+37       0
  125   6.54   78.3  -0.09   0.25  9.99E+37       0
  130   6.76   78.0  -0.07   0.30  9.99E+37       0
  135   6.73   76.3  -0.04   0.37  9.99E+37       0
  140   6.96   75.1  -0.03   0.36  9.99E+37       0
  145   6.79   72.8  -0.03   0.32  9.99E+37       0
  150   6.88   70.7   0.03   0.40  9.99E+37       0
  155   6.81   72.3   0.08   0.54  9.99E+37       0
  160   6.70   73.8   0.05   0.53  9.99E+37       0
  165   6.63   81.8   0.01  99.99  9.99E+37       0
  170   7.23   87.3  -0.02  99.99  9.99E+37       0
  175  99.99  999.9   0.17  99.99  9.99E+37       0
  180  99.99  999.9   0.28  99.99  9.99E+37       0
  185  99.99  999.9   0.36   0.56  9.99E+37       0
  190  99.99  999.9   0.25  99.99  9.99E+37       0
  195  99.99  999.9   0.30  99.99  9.99E+37       0
  200  99.99  999.9   0.26  99.99  9.99E+37       0

Table 1. Standard Meteorological (ASIMET) Parameters

Eac ASIMET module has C530 microprocessor and stored calibration coefficients handling conversion to scientific units capable of providing raw and calibrated data. The "C" command after address gets latest 1 minute average of calibrated data. "B" gets both calibrated and raw. "V" gets last 1 hour average. "L" lists all the settings including calibration coefficients.
Parameter Description
WND01 RM Young Wind speed and Direction Anemometer 1
- Ve Vn WSavg WSmax WSmin LastVane LastComp TiltXAvg TiltYAvg<crlfetx>
- "#WND01C 2.34 1.45 4.9 5.2 4.7 123.1 234.5 0.2 0.3<crlfetx>"
WND02 RM Young Wind speed and Direction Anemometer 2
- "#WND02C 2.34 1.45 4.9 5.2 4.7 123.1 234.5 0.2 0.3<crlfetx>"
- -
HRH01 Relative Humidity and Air Temperature
- RH% degc<crlfetx>
- "#HRH01C 76.163 23.555<crlfetx>"
PRC01 Precipitation
- PRC Level in mm<crlfetx>
- "#PRC01C 35.24<crlfetx> "
BPR01 Barometric Pressure
- BPRmbar<crlfetx>
- "#BPR01B 1026.31 : 1026.31<crlfetx> "
SWR01 Shortwave Radiation
- W/m^2<crlfetx>
- "#SWR01C 735.2<crlfetx>"
LWR01 Longwave Radiation
- dome and body temperatures in degrees Kelvin, thermopile voltage in microvolts, LW flux in watts/meter^2
- "#LWR01C 292.21 289.33 203.65 122.7 <crlf>"
- -
TOTAL  

Table 2. Standard Meteorological Parameters

Parameter Recorded 1-6 min Reported each 1 Hr Description
TIME x x Time and Date (UTC) of sample average
- - - -
TOTAL      

Table 3. Tower System Health and GPS Time

GPS -- Garmin GPS 16 OEM (NMEA output strings)

LINK10 -- Xantrex Link10 Power Monitor

Parameter Recorded each 1 Hr Reported each 1 Hr Description
TIME x x Time and Date (UTC) of string received at computer
GPRMC x x time, lat, lon, speed and bearing, date, magnetic variation [used to set DAQ computer clock]
-     "$GPRMC,010040,A,3554.5571,N,07903.1342,W,000.0,109.8,260107,008.6,W*77"
- - - -
LINK10 x x link10 time, kWh, amps, volts, amp hours, Peukert amp hours, Peukert amps, time remaining, bar graph state, temperature (deg C) [used to assess power system and system case or battery box temperature]
-     "32453,-00.08,-0000.0,13.25,-0000.0,-0000.0,-0000.0,255.0,5,08"
- - - -
TOTAL 2 1 strings

Table 4. In-water Instruments (Commanded via serial cable (??) for real-time data transmission)

ADCP -- Current Profile and Waves using RDI Teledyne ADCP-WavesMon (Workhorse with pressure sensor) (internally store raw data, but use ascii LogData output for real time transmission, and/or get raw binary)

CTD -- Bottom Ocean Temperature and Salinity w/ Pressure (CTD) using Seabird SBE 16-series

Parameter Recorded ea 6 min Reported each 1 Hr Description
TIME x x Time and Date (UTC) of string received at computer
CTD1 x x command echoed, sample num, water temp, conductivity, depth, ctd sample date/time
-     "#00TS 03586, 26.5634, 5.60928, 2.244, 11 Feb 1980, 02:07:35"
CTD2 x x command echoed, sample num, water temp, conductivity, depth, ctd sample date/time
-     "#01TS 03585, 26.4831, 5.59853, 11.444, 11 Feb 1980, 02:07:32"
CTD3 x x sample num, water temp, conductivity, depth, ctd sample date/time
-     "#02TS 03586, 26.5634, 5.60928, 32.244, 11 Feb 1980, 02:07:35"
ADCP x x ensemble number, YY,MM,DD,hh,mm,ss, Hs (m), Tp (sec), Dp (degN), water depth (m/1000), Dmax (m), Tmax (sec), nbins, [spd, dir]*nbins
-     "73, 07, 12, 01, 11, 52, 50, 28, 0.39, 9.10, 129.0, 8664.000, 0.50, 8.00, 50, 0.024, 182, 0.028, 197, 0.038, 165, 0.041, 164, 0.027, 121, 0.020, 96, 0.026, 162, 0.022, 177, 0.021, 183, 0.042, 117, 0.022, 156, 0.016, 117, 0.021, 127, 0.141, 231, 0.350, 220, 0.270, 209, 0.187, 258, 0.184, 259, 0.183, 268, 0.214, 266, 0.235, 272, 0.281, 276, 0.206, 259, 0.291, 15, 0.124, 339, -32768.000, -32768, -32768.000, -32768, -32768.000, -32768, -32768.000, -32768, 0.625, 227, 0.486, 233, 0.215, 254, 0.182, 351, 0.339, 11, 0.428, 22, 0.527, 44, 0.424, 45, 0.657, 41, 0.847, 65, 1.118, 73, 0.766, 52, -32768.000, -32768, -32768.000, -32768, -32768.000, -32768, -32768.000, -32768, 0.537, 271, 0.363, 231, 0.334, 245, 0.229, 257, -32768.000, -32768"
- - - -
TOTAL 4 1-10 strings

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