B08_Attachment_-_Specifications_(2).pdf

Requisition#

US Geological Survey

St. Petersburg Coastal and Marine Science Center St Petersburg, FL 33701

I. FUNCTIONAL REQUIREMENTS

The USGS Coastal and Marine Science Center in St. Petersburg Florida requires five instrument packages to measure near-real time directional waves in 20 m water depth for coastal hazards studies. Each instrument package shall consist of a solar powered GPS wave buoy. The system shall be capable of collecting data autonomously for periods of at least 6 months. The wave buoy shall be small, less than 45 cm in diameter and weight less than 6 kg without ballast and mooring, to allow for transport and deployments off small vessels. The buoy shall measure wave frequencies from at least 0.03 to 1 Hz with a sampling rate of at least 2.5 Hz. The wave displacement accuracy shall be greater than ±2 cm under normal operating conditions. Calibration of the wave buoy shall not be required. 3D displacement data shall be stored on the wave buoy on a removable data card of at least 16 GB. The wave buoy shall have onboard processing of common wave statistics: significant wave height, peak period, mean period, peak direction, mean direction, peak directional spread, mean directional spread, variance density spectrum, and directional moments. The wave buoy must provide estimates of wind speed and direction. The wave buoy must have the ability to transmit data in near-real time via cellular or satellite connectivity. A mooring line or cable for the wave buoy shall be included to securely tether the wave buoy to a bottom mounted mooring. Access to a web interface and api needs to be provided for viewing and downloading data. The instrument package needs to be robust for use in salt water and large wave conditions. Enclosures, sensors, and cables should be made of corrosion resistant materials such as plastics and polyurethane, use of metals to be kept to a minimum and to corrosion resistant alloys such as stainless steel and titanium.