CSI-09
Location: Grand Isle Blocks, Coordinates: 89º58.69',29º6.09'
CSI-09 NEAR REAL TIME DATA (Pressure Sensor)
Last Updated: 9/26/2017 2:45 (UTC)
(CST)
Sustained Wind Speed: 1.577 m/s (3.07 knots)
Wind Direction: 104 degrees
Gust: 2.626 m/s (5.1 knots)
Air Temperature: N/A ºC
Barometric Pressure: 1011.15 mb
Humidity: -9999%
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About CSI-9 CSI-9 Information (collapse)
   
Near-Real-Time Meteorological and Hydrodynamic Monitoring:
Concept, Fabrication, and Data Processing

Both the hardware and software were designed and fabricated at the Coastal Studies Institute (CSI) at Louisiana State University (LSU). The hardware comprising the monitoring station consists of three components; power supply, measurement module, and communication module. The software includes the remote control and communication module as well as the data processing module.

Hardware

The hardware package was designed and assembled by the Field Support Group at the Coastal Studies Institute, at Louisiana State University.

1. Power Supply: The ventilation fans and computer monitor, the ADCP Rio Grand Workhorse (1200Khz) and the Belfort Visibility Sensor (Model 6100) are each powered by a deep cycle lead/acid marine battery of 115 ampere-hour capacity. The batteries are charged by a Newmar 12Vdc (Model RM-2033) battery charger capable of charging 3 isolated battery banks. The measurement module (CR23X4M) is powered by two internal 6 ampere/hour sealed lead acid batteries charged by a 120 VAC/18VAC plug-in transformer. The CR23X provides the power needed for the operation of most of the sensors, and the storage and transmission of data. The On-Site Computer is powered by a 24Vdc power system consisting of 2 115 Amp/Hour batteries connected in series. The computer has a special ATX power supply designed to run off of 24Vdc. These batteries are charged by a Newmar 24Vdc battery charger (Model RM-2415). The present power supply system for the station was designed to run the entire station for 24 hours. The actual time is closer to 36 hours as proven during Hurricane Lili when the oil platform’s generator shut down about 12 hours before the storm actual passage over the station. The present power supply has proven to be adequate for the designed hourly sampling and data transmission. The system has not experienced a power shortage since going on line in 2000.

2. Sensor Package and Data Storage: The sensor package includes above water meteorological sensors and underwater hydrodynamic sensors. The meteorological sensors,including a windbird, a barometer, and an electronic thermometer, provide measurements of wind speed, wind direction, air temperature, humidity, visibility and barometric pressure. The hydrodynamic sensors, including a digiquartz pressure transducer and an electronic thermometer, provide measurements of waves, water level, and near-surface water temperature. The on-site data are stored in a Campbell CR23X Data-Logger. The CR23X also functions as the central control of the remote station. The entire automated operation is executed by the software developed by Coastal Studies Institute personnel upon the operation-platform and interface-drivers provided by Campbell Scientific Inc and the Field Support Group. The user-developed software controls the sampling scheme and the operational control of all of the sensors and the computer.

3. Communication Package: Retrieval of the data is done through a dedicated telephone line at the receiving station. The automated communication is controlled by Symantic’s PC Anywhere software with the capability of regular data downloading and remote control from the Coastal Studies Institute. The sampling and communication schemes can be modified remotely from Coastal Studies Institute. The remote control also allows quality checks of the sensors and power supply. The entire hardware is mounted on a Chevron/Texaco manned oil platform (TS-217A). LSU and Coastal Studies Institute sincerely thank Chevron/Texaco for providing the facilities and support necessary to make this vital and important program a success. The wind speed and direction, and air temperature are measured at approximately 20 m above mean water level. The barometric pressure is measured at approximately 12 m above mean water level. The near-surface water temperature and water-level fluctuation are measured at approximately 2 m below mean water level to minimize the depth-attenuation of strength of the high-frequency wave signal.

SOFTWARE

The software package includes a communication control module, an automated data processing module, and an automated online database.

1. Communication Control: Symantic’s PC Anywhere communications software allows for the hourly transfer of the Campbell data and the ADCP data. This software also allows us to remotely access both the ADCP and the CR23X directly so that troubleshooting and changes can be made in real time to one or both systems. The communications with the CR23X was developed on the platform of Campbell PC208 software. PC208W initiates the automated data downloading every hour and also allows irregular manual data downloading. It also controls when the ADCP data is taken. Remote modification of the on-site operation can be executed from a Coastal Studies Institute laboratory via PC Anywhere.

2. Sampling Scheme and Data Processing: The meteorological parameters, including wind speed and direction, barometric pressure, air temperature, and water temperature are sampled at 1 Hz for a 10-min period beginning 10 minutes before the top of every hour. The hydrodynamic parameters, including water depth and current velocity, are sampled at 2 Hz for approximately 17 minute period at the beginning of every hour. Two thousand and forty-eight samples are collected during each wave burst. The high-frequency sampling was designed to ensure reliable measurements of locally wind-generated waves in the sound, which have peak periods typically ranging from 2 to 4 seconds. The data processing, including data averaging and directional spectral analysis, is initiated automatically immediately after each data downloading. The posted wind speed and direction, barometric pressure, air temperature, and near-surfacewater temperature represent averages over the 10 minute period at the beginning of the hour. Wind gust, the highest 5-s average during the sampling period, is calculated on site. Water depth, current velocity, and current direction are averaged over the 8.5-min sampling interval. Directional wave spectra are calculated following the procedure described by the US Army Corps of Engineers (USACE) Field Wave Gaging Program (FWGP). The automated directional wave spectra analysis software was mostly developed at the Coastal Studies Institute. Two central functions, the fast-Fourier transformation and computation of cross-spectral density, were included from the Wave Data Analysis Standard Spectral Analysis Program (WDASSAP) developed by USACE. Wave parameters posted on the Internet include significant wave height, maximum wave height,dominant wave direction, peak wave period, and average wave period. Detailed directional wave spectra are archived for future analysis. The RD Instrument’s ADCP is controlled and initiated by the computer via the PC208 Software. The wavesmon program controls the ADCP and provides for the storage of the raw data as well as the processing of the data. Water currents and the water current direction are provided from near the bottom to near the surface in 35cm bins. Significant wave height, peak wave height, average period, peak period, peak wave direction and the directional wave spectra are the parameters that are separate from the CR23X data but included in separate files that are transferred to Coastal Studies Institute via the PC Anywhere program.

3. Online Information: The data are processed automatically following successive data downloading every hour. The information is archived in a relational database, and posted to the web page simultaneously. The interactive web page is designed not only for users to acquire the latest updated information, but also to provide an interface for users to access our online database. All information in the database can be retrieved, queried, and graphically viewed on the web page. The Raw ADCP data is retrieved periodically from the site and archived. This data can be obtained by contacting Dr. Changxing Li. Arrangements can then be made on how to best transfer the data set that you are interested in.

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