Data from a Directional Waverider Buoy off Waimea Bay, North Shore, Oahu during December 2001 - July 2004 (NODC Accession 0001626)

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Frequently anticipated questions:


What does this data set describe?

Title:
Data from a Directional Waverider Buoy off Waimea Bay, North Shore, Oahu during December 2001 - July 2004 (NODC Accession 0001626)
Abstract:
Through various funding channels, the Department of Oceanography at the University of Hawaii (UH) has maintained a Datawell Directional Waverider Buoy roughly 5 km northwest of Waimea Bay, Oahu in roughly 200 m ocean depth since 9 December, 2001. The buoy is a 0.9 m metallic floating sphere with a combination of a bungee and chain anchoring system. The long-term availability of this mooring is uncertain.

The directional waverider measures the horizontal and vertical components of acceleration of the buoy, which rides up and down with the waves as it floats on the surface. The sampling rate is 1 Hz and the acquisition time is 20 minutes. From the accelerations of each acquisition time, spectra of energy by frequency and direction are derived. In addition, significant wave height and dominant wave period are calculated. The information is relayed to a shore data logging platform every 30 minutes. The Coastal Data Information Program (CDIP) are the primary stewards of the real-time data while UH handles maintenance duties.

Supplemental_Information:
Entry_ID Unknown Sensor_Name Datawell Waverider Buoy Project_Campaign: Oahu Wave Modeling Originating_Center Datawell Waverider Buoy Storage_Medium ASCII Online_size: 9730 kbyte

Resource Description: NODC Accession Number 0001626

  1. How might this data set be cited?
    Mr. Jerome Aucan, University of Hawaii, and Dr. Mark Merrifield, University of Hawaii, Unknown, Data from a Directional Waverider Buoy off Waimea Bay, North Shore, Oahu during December 2001 - July 2004 (NODC Accession 0001626): None None, Unpublished Material, Unpublished Material.

    Online Links:

  2. What geographic area does the data set cover?
    West_Bounding_Coordinate: -158.1176
    East_Bounding_Coordinate: -158.1176
    North_Bounding_Coordinate: 21.6726
    South_Bounding_Coordinate: 21.6726
  3. What does it look like?
  4. Does the data set describe conditions during a particular time period?
    Beginning_Date: 16-Dec-2001
    Ending_Date: 14-Jul-2004
    Currentness_Reference: ground condition
  5. What is the general form of this data set?
  6. How does the data set represent geographic features?
    1. How are geographic features stored in the data set?
    2. What coordinate system is used to represent geographic features?
  7. How does the data set describe geographic features?
    Entity_and_Attribute_Overview:
    ASCII text files are found in ../../data

    Data File Corresponding Comment Description File 8band_dir.txt 8band_dir_desc.txt Direction by period band 9band_ene.txt 9band_ene_desc.txt Energy by period band parameter.txt parameter_desc.txt Sig. height, Dominent Period, Average Period, Dominant Direction, SST

    Entity_and_Attribute_Detail_Citation: none

Who produced the data set?

  1. Who are the originators of the data set? (may include formal authors, digital compilers, and editors)
  2. Who also contributed to the data set?
    Department of Oceanography, School of Ocean and Earth Science and Technology, University of Hawaii and Coastal Data Information Program, Scripps Institute of Oceanography
  3. To whom should users address questions about the data?
    Jerome Aucan
    University of Hawaii
    Graduate student
    1000 Pope Rd.
    Honolulu, Hawaii
    USA

    (808) 956-7633 (voice)
    jaucan@soest.hawaii.edu

Why was the data set created?

The wave data were acquired for application to physical models and near shore wave studies.

How was the data set created?

  1. From what previous works were the data drawn?
  2. How were the data generated, processed, and modified?
    Date: Unknown (process 1 of 1)
    The .9 meter diameter Waverider measures wave height by measuring the vertical acceleration of the buoy. The discrepancy between vertical movement of the Waverider and the movement of the sea surface is small. When a moored Waverider follows the waves, the force of the mooring line will change. This force is produced by the changing immersion of the buoy, resulting in a error of max. 1.5%. With decreasing wave length, the buoy will not follow the wave amplitude if the wave length is less than 5m [wave period below 1.8 sec.]. If the wave length is less than 2.5m [wave period 1.25 sec.] the buoy's response decreases quickly. The directional Waverider measures wave height in the same manner as the Waverider. The directional wave measurements are calculated from the x, y, and z accelerations of the buoy. Person who carried out this activity:
    Jerome Aucan
    University of Hawaii
    Graduate student
    1000 Pope Rd.
    Honolulu, Hawaii
    USA

    (808) 956-7633 (voice)
    jaucan@soest.hawaii.edu
    Data sources used in this process:
    • none
  3. What similar or related data should the user be aware of?

How reliable are the data; what problems remain in the data set?

  1. How well have the observations been checked?
  2. How accurate are the geographic locations?
  3. How accurate are the heights or depths?
  4. Where are the gaps in the data? What is missing?
    none
  5. How consistent are the relationships among the observations, including topology?
    see lineage, process step

How can someone get a copy of the data set?

Are there legal restrictions on access or use of the data?
Access_Constraints: None
Use_Constraints: Dataset credit required
  1. Who distributes the data set? (Distributor 1 of 1)
    NOAA/NESDIS/National Oceanographic Data Center
    Attn: User Services Team
    SSMC-3 Fourth Floor
    Silver Spring, MD
    USA

    301-713-3277 (voice)
    301-713-3302 (FAX)
    NODC.Services@noaa.gov
    Hours_of_Service: 8am-5pm, Monday through Friday
  2. What's the catalog number I need to order this data set? Downloadable Data
  3. What legal disclaimers am I supposed to read?
    NOAA makes no warranty regarding these data, expressed or implied, nor does the fact of distribution constitute such a warranty. NOAA and NODC cannot assume liability for any damages caused by any errors or omissions in these data, nor as a result of the failure of these data to function on a particular system.
  4. How can I download or order the data?

Who wrote the metadata?

Dates:
Last modified: 06-Jan-2021
Last Reviewed: 16-Sep-2009
Metadata author:
Mr. Patrick C. Caldwell
NOAA/NESDIS/NODC/NCDDC
Hawaii/US Pacific Liaison
1000 Pope Road, MSB 316
Honolulu, Hawaii
USA

(808)-956-4105 (voice)
(808) 956-2352 (FAX)
caldwell@hawaii.edu
Hours_of_Service: 8 AM to 5 PM weekdays
Contact_Instructions: check services@nodc.noaa.gov if not available
Metadata standard:
FGDC CSDGM (FGDC-STD-001-1998)

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