
#CONTRIBUTOR(S), INSTITUTE(S), CONTACT INFORMATION:
Jessica Podoski
U.S. Army Corp. of Engineers
Building 230, Fort Shafter, HI 96858-5440
(808) 438-1069
email: jessica.h.podoski@poh01.usace.army.mil

#ORIGINATOR(S), INSTITUTE(S), CONTACT INFORMATION:
Kent K. Hathaway
Research Oceanographer 
Coastal and Hydraulics Laboratory, Field Research Facility
U.S. Army Engineer Research and Development Center
1261 Duck Road
Kitty Hawk, NC 27949
(252) 261-6840 (x224)
(252) 261-4432  (FAX)
Kent.K.Hathaway@usace.army.mil

Stan Boc
Coastal and Hydraulics Laboratory
U.S. Army Engineer Research and Development Center
3009 Halls Ferry Raod
Vicksburg, MS  39180

#TITLE: 
Wave and Current Data from Southeast Oahu, Hawaii during August -
September 2005

#ABSTRACT: 
Field data collection was conducted for the U.S. Army Engineer District,
Pacific Ocean, Honolulu (POH), during August 9 - September 14, 2005,  
off Kailua, Lanikai, and Waimanalo, Oahu, Hawaii.  Wave and current data 
were collected at five fixed locations using bottom-mounted RD Instruments 
Workhorse, 1.2 MHz, ADCPs (Acoustic Doppler Current Profilers) and Sontek
Hydra ADVs (Acoustic Doppler Velocimeters).  The ADCPs include wave 
measurements.  

Four inexpensive current drogues (drifters) were designed and built at the 
CHL Field Research Facility (FRF) that used GPS tracking and radio telemetry 
for positioning.  Deployments were made on 10 August and 13 September.
June.

#PURPOSE:  
Learn of current and wave patterns in the bay for design considerations.

#PROJECT:
US Army Corp. of Engineers Regional Field Study--
Southeast Oahu 2005

#FUNDING:
Funding for the study was provided by the POH District of the U.S. Army Corps
of Engineers 

#ACKNOWLEDGEMENTS:
The field data collection study of the Southeast Oahu, Hawaii
was performed for the U.S. Army Engineer District, Pacific Ocean,
Honolulu (CEPOH) with support from the U.S. Army Engineer Research and 
Development Center (ERDC), Coastal and Hydraulics Laboratory's (CHL) 
Field Research Facility (FRF).

#LOCATION EXTREMES:
SOUTHERNMOST LATITUDE:  21.329912
SOUTHERNMOST LATITUDE HEMISPHERE: N
NORTHERNMOST LATITUDE:  21.398416
NORTHERNMOST LATITUDE HEMISPHERE: N
WESTERNMOST LONGITUDE: 157.71798
WESTERNMOST LONGITUDE HEMISPHERE: W 
EASTERNMOST LONGITUDE: 157.67976
EASTERNMOST LONGITUDE HEMISPHERE: W  

#LOCATION KEYWORDS: 
North Pacific, Hawaii, Oahu, Southeast Oahu, Kailua, Lanikai, Waimanalo

#SAMPLING STATIONS:
Maps and specific locations given in
../data/0-data/SoutheastOahu_FieldData/HiRSM.analysis-2.0.doc
../data/1-data/SoutheastOahu_FieldData/HiRSM.analysis-2.0.txt

#BEGIN AND END DATES: 
yyyymmdd
20050809 - 20050914

#SAMPLING PERIODS:
See Reports noted above

#PARAMETERS: 
u-component current velocity
v-component current velocity
w-component current velocity
current speed
current direction
amplitude of acoustic backscatter
temperature
depth
wave height
wave direction
wave dominant period
wave spectrum
wave directional spectrum

#METHODOLOGY:
The following was taken from the above mentioned report:

ADCP Gauges:
The ADCP gauges were RD Instruments 1200 kHz Workhorse, bottom mounted facing
upward with the sensor head approximately 0.4 m off the bottom.  Figure 2
(report) shows the custom built mount that was held to the bottom with 
about 80 lbs of lead weight.  These gauges have four acoustic transducers 
for measuring currents and a pressure sensor, from which horizontal and 
vertical current profiles were computed at 0.2 m vertical spacing.  These 
units sampled at 2 Hz for directional wave measurements.  Each hourly wave 
burst was approximately 34 minute long, starting at the top of each hour, 
and consisted of 4096 points.  There is a 0.44 m blanking distance from the 
transducer head, and with a 0.2 m bin width this makes the first sample 
0.72 m past the transducer, or about 1.12 m off the bottom.  Current profiles 
were collected every 10 minutes from a 200 point average.

Deployments were on 9 Aug 2005 and retrieved on 14 Sep 2005.  ADCP-2 was
reprogrammed on 10 Aug so collection started a day later, and the batteries
were depleted on 4 Sep, about 10 days before retrieval of the other gages.

ADV Gauges:
The three ADV gages were the Sontek's Hydra model that sample a single
point current velocity (U, V, and W) and contained an external pressure
sensor.  The instrument frame and ADV transducer are shown in Figure 3 (
report, after gauge retrieval). The sample volume for the current 
measurement is approximately 1-2 cm in size and about 0.17 m from the 
center transducer.  This unit uses three beams to determine the three 
current components.

Current Drogues:
Four inexpensive current drogues (drifters) were designed and built at the CHL
Field Research Facility (FRF) that used GPS tracking and radio telemetry for
positioning. They were constructed with off the shelf plumbing supplies (PVC
pipe, vertical risers, rubber unions, hose clamps), a Garmin Geko GPS
receivers, and MaxStream (model XStream-PKG-R) radio modems (Figure 4, report).
The sails had about a one meter cross-section. The lower vertical PCV pipe
(submerged) contained the modem and batteries, the upper horizontal pipe
contained the GPS receiver and radio antennas.  A NEMA GPS data string was
transmitted once per second and the Garmin GCP unit internally recorded
positions every 30 seconds.  These GPS units are WAAS enabled and should have
a horizontal accuracy of about 3 m.  The radio tracking was partially
successful- it required line of sight which was not possible to
simultaneously receive drifters in the Kailua and Waimanalo Bays.  Also the
antennas and connectors should be more robust, two broke during deployment.

#INSTRUMENT TYPES:
RD Instruments Workhorse ADCPs (Acoustic Doppler Current Profilers)
Sontek Hydra ADVs (Acoustic Doppler Velocimeters)
current drogues (drifters)

#REFERENCES: 
Similar instruments and procedures are described in:
Hathaway, K. K and S. Boc, 2008. Field Data Collection Study Final
Report: Natatorium Current Study, Waikiki, HI.  U.S. Army Engineering
POH District, Honolulu, HI., ERDC/CHL TR-08. 55p.

#SUBMITTING MEDIUM:
DVD

#DIRECTORY ORGANIZATION, FILE NAMES AND FORMATS:

Note: all times are in UTC

within ../data/

0-data/ : This directory contains the original set of directories and files
1-data/ : Directories and files prepared by NODC (such files are
          prepared if original formats are non-proprietary)

Contents of 0-data/:
Directory SoutheastOahu_FieldData/adcp1/

Files:
HI010adc.20050809_20050914.meta
HI010adc.sum.20050809_20050916.txt
Comment:
Deployment summaries from instrument configuration files.

File:
HI010adc_vac_2005_mm.txt  (mm=month, ie, 08, 09)
Comment:
Vertically averaged current (VAC) by month.  Uave = positive going
eastward (mm/s), Vave = positive going north (mm/s).

file:
readAdcpDSpec.m
comment:
Matlab code snippet to read directional wave spectra files (DSpec/).

subdirectory: adcp1/Dspec
comment:
Wave directional spectra files (reformatted) from RDI WavesMon 
program.  One file for each hour.  See the Matlab code snippet 
readAdcpDSpec.m.  Units are m^2/Hz/Deg.

subdirectory adcp1/Fspec
comment:
Non-directional ADCP spectra, one file each hour
Filename example: VSPspec.HIAD1.200508092100.UTC.asc 
This example is for 09 Aug 2005 at 2100 UTC.

Format:
Columnar ASCII spectra from ADCP Velocity, Surface, and Pressure (VSP).
Energy units are m^2/Hz/Deg, And frequency is in Hz.

subdirectory adcp1/Stats
comment:
wave and current statistics files by month (08=Aug, 09=Sep)

file:
HI010adc_cur_2005_mm_pfl.mat
comment:
(by month, mm)
Matlab format current profile data
        Variables:
           Uave1 = vertically averaged east current (mm/s)
           Vave1 = vertically averaged north current (mm/s)
           Ux1 = east current profile (cm/s)
           Vx1= north current profile (cm/s)
           depth = nominal depth of center of each bin
           stime = Matlab time format
ASCII text files of all parameters 
in ../data/1-data/SoutheastOahu_FieldData/adcp1/Stats 

file:
HI010adc_wmo_2005_mm_UTC.txt
comment:
(by month, mm)
Wave and current profiles, file by month, mm, columnar ASCII, one line per
wave collection, space delimited.  Format follows:
        Burst# YY MM DD HH mm ss cc Hs(m) Tp(s) Dp(deg) Depth(mm) Hmax(m)
        Tmean(s) bins depthlevel1Magnitude(m/s) depthlevel1Direction(deg)
        depthlevelNMagnitude(m/s) depthlevelNDirection(deg)
        Symbols:
        YY      Year
        MM      Month
        DD      Day
        HH      Hour
        mm      Minute
        ss      Second
        cc      1/100ths seconds
        Hs      Significant Wave Height = 4*sqrt(area under the power spectrum)
        Tp      Peak period             = Wave period associated with the 
                                          largest peak in the power spectrum
        Dp      Peak Direction          = peak direction at the peak period.

subdirectory adcp2/
See explanation for filenames, directory names, and formats in adcp1/

subdirectory advData/
Processed ADV files.  Files listed below are for ADV-1, there are similar 
files for ADV-2 and 3. The ADV wave data from ViewHydra was suspect and 
has been removed from the dataset use
adv_??.curWave.txt files (?? = y1, g2, and r3).

file:
README.advFormat
comment:
summary of formats for files on this directory

file:
adv_??config.txt
comment:
configuration files

file:
adv_??.curWave.txt
comment:
 Wave and curent stats with some QC data (where ?? = Gauge ID: y1, g2, or r3)
See README.advFormat for details

subdirectory advData/spec
comment:
Columnar ASCII spectra files, one per collection per gauge
(see README.advFormat).

subdirectory drogue/
comment:
GPS drogue (drifter) data, 10 Aug and 13 Sep.  

file: 
gpsNmmm.dat 
comment:
N: track number of the drogue
mmm: month (Aug or Sep); for example, gps1Aug.dat is for track-1 on 10 Aug.

columnar ASCII, with UTC time, (ignore data in column 6) 
latitude and longitude minutes (from Lat 21 degrees N and Lon 157 degrees W),
drogue speed (m/s) and direction going towards 
    (degrees positive clockwise from north).

#DATASET SIZE:
231756 kbytes

#NUMBER OF DATA UNITS:
5 stations; 2 drogue deployments

#MISCELLANEOUS:
Similar sets at NODC
NODC Accession  Comment
0044080         Wave and current data Natatorium, Waikiki August 2007
0051060         Wave and current data Hilo, Hawaii March-June 2007
