. Raccolte le ristampe / Atlantic oceanografia e laboratori meteorologici [e] Pacifico laboratori oceanografici. Oceanografia periodici.. 65 LA NATURA 269, n. 5631, 790-791. Imaging acustico della Nuova Inghilterra shelf-pendio acqua interfacce di massa a impulsi ad alta frequenza acustica ha dimostrato di avere delle applicazioni uniche per il rilevamento e la misurazione della Oceanic fenomeni come le onde interne""' e dispersione di ocean-oggetto di dumping fanghi di depurazione' ' o dragare materiale". Con moderata ad alta velocità di ripetizione di impulsi, praticamente un con- tinuous record della colonna d'acqua resistenza di dispersione è ava

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. Collected reprints / Atlantic Oceanographic and Meteorological Laboratories [and] Pacific Oceanographic Laboratories. Oceanography Periodicals.. 65 Nature 269, No. 5631, 790-791. Acoustic imaging of the New England shelf-slope water mass interfaces Pulsed high frequency acoustics has been shown to have unique applications in the detection and measurement of oceanic phenomena such as internal waves'"' and dispersion of ocean-dumped sewage sludge' ' or dredge material'. With moderate to high pulse repetition rates, a virtually con- tinuous record of water column scattering strength is available to depths of the order of 500 m from a ship travelling at speeds of 4 or 5 knots. We used this feature to detect acoustically the interfaces associated with an intrusion of cold New England shelf water into the warmer slope water during a 9-d period in June 1976. From 15 to 23 June 1976 measurements of effects of internal waves were made from the National Oceanic and Atmospheric .Administration (NOAA) ship George B. Kelez in an area on the New England continental shelf partly shown in Fig. 1. Although measurements were made on three tracklines shown, most of the work concentrated on the centre trackline. A 1-kW 20-kHz pulsed acoustic system, specially modified for detection of weak signals scattered from the water column, was operated continuously through- out the cruise. Field operation of this system has been described previously*'. Profiles using expendable bathy- thermographs (XBT) and a conductivity-temperature-depth probe (CTD) were obtained at regular intervals. Throughout the cruise, the acoustic record revealed a reflecting layer (Fig. 2) of limited horizontal extent and rather variable location. Some observations of the offshore boundary of this layer are indicated in Fig. 1. The layer was observed in all cases (18 observations) to have a slope opposite to that of the bottom. As shown along the ship's trackline, the layer displayed apparent widths of 2.8-7.4 km

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