Abstract
Studies have been carried out on the oceanic bottom boundary layer using 20 kHz and 3 MHz sound systems. Data will be presented on the generation of a suspended layer of sediment, essentially confined within the bottom boundary layer, by nonlinear internal wave groups on the N.Y. Continental shelf in 120 m of water. Data will also be presented on the existence of a large underwater “cloud” of material found on the continental slope (water depth typically (600-300 m) which has been observed consistently over the last several years and which is highly acoustically reflective. Some data from a high resolution (≃ 1 cm) 3 mHz-acoustical system on particulate concentration estimation will be presented.
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