Advanced Coherent Technologies, LLC (ACT) is using a multi-spectral, multi-channel imaging system to detect and monitor marine mammals. The system, designed with US Navy funding, is intended to monitor mammals on US Navy submarine training ranges prior to and during Navy active acoustic training activities. ACT has conducted system tests and data collection activities at the St. Lawrence Seaway (Quebec, Canada), at Ma'alaea Bay (Maui, Hawaii), and from the Coronado Bay Bridge (San Diego, California). A description of the imaging system and the results of the data collections are discussed and presented.
This work presents an electro-optical multispectral capability that detects and monitors marine mammals. It is a continuance of Whale Search Radar SBIR program funded by PMA-264 through NAVAIR. A lightweight, multispectral, turreted imaging system is designed for airborne and ship based platforms to detect and monitor marine mammals. The system tests were conducted over the Humpback whale breeding and calving area in Maui, Hawaii. The results of the tests and the system description are presented. The development of an automatic whale detection algorithm is discussed as well as methodology used to turn raw survey data into quantifiable data products.
A comparison of results from mapping using a swath bathymetric sonar system in the Tay Estuary, Scotland, and remote sensing data on the position of frontal systems, indicates that the frontal systems are controlling the distribution of sedimentary features in the estuary. The boundaries between zones, defined by the advancing flood fronts and exiting fresh water, are sharply defined both by the front and the bottom bedforms. Static fronts, usually axial fronts, exist at well-defined bathymetric changes and result in relatively stable bedforms. However, measurements of current velocities at migrating fronts suggest that the vertical component of velocity accelerated at the front boundary will cause erosion at the bed and migrating bed features. Predictions of sediment movement and sediment feature migration rates across areas where these fronts migrate are confirmed by the bathymetric sidescan sonar results that show asymmetry of the sedimentary dune features. The use of new high-resolution sonar, together with its repeatable precision in locating sedimentary bedforms, has significant implications for long-term modelling of sediment transport in estuaries and other similar areas.
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