Abstract
A 3‐MHz acoustic concentration meter (ACM), which measures the intensity of backscattered acoustic energy, has been deployed in the laboratory and in the field in order to estimate the concentration of suspended sand. Techniques for measuring the profile of the concentration of suspended sand close to the seabed with a vertical resolution of about 1 cm are discussed. The scattering characteristics of suspended sand in a laboratory tank were used to provide a method of calibration for the ACM. The dependence of the scattering coefficients upon sediment size was also investigated. The ACM was deployed in the surf zone at Starthope Lane, Prince Edward Island, Canada, in October 1984. In the surf zone, the limitations of such profilometers are (a) air bubbles injected into the water by breaking waves, and (b) the possible variations in sand size with height above the seabed. [Work supported by Naval Facilities Engineering Command.]
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