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Science 27 April 1984:
Vol. 224. no. 4647, pp. 384 - 387
DOI: 10.1126/science.224.4647.384
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Articles

Turbidity Currents: Monitoring Their Occurrence and Movement with a Three-Dimensional Sensor Network

FRANK H. WEIRICH 1

1 Department of Geography, University of California, Los Angeles 90024

Detailed field data on the occurrence, flow pattern, and internal dynamics of both surge and continuous turbidity currents have been obtained with a three-dimensional array of optical and thermal sensors. The array, operated in a glacial lake in southeastern British Columbia, collected detailed information on the character of surge events with velocities reaching 110 centimeters per second and continuous underflows exceeding 90 centimeters per second. Thefindings (i) indicate that such currents are frequent events, occurring with density differences between the incoming stream water and the lake water as low as 0.19 kilogram per cubic meter of water; (ii) document the differences in the initiation and internal characteristics of the continuous and surge events; and (iii) support the concept of erosion by turbidity currents.

Submitted on February 17, 1983
Accepted on February 10, 1984


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