Photographic measurements of bottom currents
Bruce, J.G. Jr.; Thorndike, E.M. (1967). Photographic measurements of bottom currents, in: Hersey, J.B. (Ed.) Deep-sea photography. pp. 107-111
In: Hersey, J.B. (Ed.) (1967). Deep-sea photography. The John Hopkins Oceanographic Studies, 3. The John Hopkins Press: Baltimore. 310 pp., meer
In: The John Hopkins Oceanographic Studies. ISSN 0271-2229, meer
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| Auteurs | | Top |
- Bruce, J.G. Jr.
- Thorndike, E.M.
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| Abstract |
Underwater cameras are used in several metbods of making bottom-current measurements. Each method employs a tripod base that rests on the bottom, and the camera is used to photograph various current indicators such as an impeller, suspended balls or pendula of several weights, or neutrally buoyant drops of a liquid immiscible with water. Direction is given relative to a compass placed in the photographic field, and speeds ranging from less than 1 cm/sec to over 50 cm/sec can be measured by proper choice of the indicator. This article describes how such measurements are made, and indicates several other possible applications of photographic current meters. |
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