NDLI: Real-time current and wave measurements in ports and harbors using ADCP

Content Provider	IEEE Xplore Digital Library
Author	Shih, H.H.
Copyright Year	2012
Description	Author affiliation: OceanTech Consulting, Potomac, Maryland, U.S.A., NOAA/National Ocean Service, Physical Scientist (Retired) (Shih, H.H.)
Abstract	Both waves and currents rank highly by user groups among oceanographic observation variables. Real-time information of these variables is especially useful for vessel operators and recreational users in and around ports, harbors and bays. Other applications include coastal land management, ecosystem protection and restoration, mitigation of coast hazards and marine accidents, forecast, warning and search and rescue. The U.S. National Ocean Service (NOS) of NOAA maintains and operates a Physical Oceanography Real-Time System (PORTS®) in the Nation's major ports and harbors. Typical hydrological parameters measured include water levels, currents, conductivity, water temperature and depth. Wave information is of interest to PORTS® users, but has only been obtained recently in a few PORTS® sites. However, continued study and laboratory and field testing of various wave measurement instruments and real-time data telemetry technologies have been conducted since 2003. These instruments and technologies include Triaxys Directional Wave buoy, Directional Waverider buoy, and acoustic Doppler current profilers, underwater acoustic modem and links with radio and satellite. Extraction of non-directional wave information from near shore tide gauges (e.g., air acoustic gage and microwave radar altimeter) has also been studied. Among these, acoustic Doppler current profilers (or ADCP) are of particular interest since they are key instrument in PORTS® for current measurements. It is economically and functionally attractive to measure both currents and waves. This paper summarizes the NOS operational system and results of two NOS field studies of real-time ADCP systems for current and wave measurements in ports and harbors. The operational system includes bottom-mounted ADCP with buried cable in the navigation channel. Later, the system was replaced by a U.S. Coast Guard Aid-to-Navigation (ATON) buoy-mounted ADCP with telemetry radio. Shore based Horizontal ADCPs are also being used for real-time current measurement. The two studies (in 2003 and 2008) used different ADCP instruments and data telemetry techniques. The ADCPs used were RDI Workhorse series and AWAC (with internal processor). The underwater acoustic modems used were models UWM1000 and UWM2000H by LinkQuest. The data telemetry technologies used were FreeWave 900MHz spread spectrum line-of-sight radios, and Iridium satellite.
Starting Page	1
Ending Page	8
File Size	1896283
Page Count	8
File Format	PDF
ISBN	9781457720895
e-ISBN	9781457720918
DOI	10.1109/OCEANS-Yeosu.2012.6263642
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2012-05-21
Publisher Place	Korea (South)
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Modems Current measurement Sea measurements Acoustic measurements Real time systems Instruments Extraterrestrial measurements Satellite Coastal Ocean Observation Real-time Ports Harbors Bays ADCP Underwater Acoustic modem
Content Type	Text
Resource Type	Article

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