Secondary Circulation Data Acquisition System

by Misganaw Demissie, Illinois State Water Survey, Champaign, IL, USA,
Nani G. Bhowmik, Illinois State Water Survey, Champaign, IL, USA,
W. Hall C. Maxwell, Illinois State Water Survey, Champaign, IL, USA,
Ta-Wei David Soong, Illinois State Water Survey, Champaign, IL, USA,



Document Type: Proceeding Paper

Part of: Hydraulics and Hydrology in the Small Computer Age

Abstract: A computerized field data collection system was developed for a project investigating secondary circulation in natural rivers. The instrumentation includes a Commodore mini-computer with tape drive, a Marsh-McBirney electromagnetic current meter and an interface between the current meter and the computer. A computer program was developed for the Commodore to retrieve, process and store field data on cassette tapes. Once in the computer's memory space, the information is processed by a computer program to give velocity readings in ft/sec and directions in degrees. The velocity data can then be recorded onto cassette tapes either in a summary form with the mean velocities and their standard deviations or in detail with all the individual readings for every time interval during the sampling period.

Subject Headings: Data processing | Data collection | Field tests | Hydrologic data | Computer software | Water circulation | Rivers and streams

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