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|Title:||Evaluation of instruments for turbulence measurements, 1949-1950|
|Authors:||United States. Mississippi River Commission.|
U.S. Army Engineer Waterways Experiment Station.
|Publisher:||U.S. Army Engineer Waterways Experiment Station.|
Engineer Research and Development Center (U.S.)
|Series/Report no.:||Potamology investigations report ; no. 10-4.|
Introduction: The instruments described in this report were developed for use in the Potamology Investigations of 1949-1950. Selection of these particular instruments was based on two factors: (1) decisions of Hydraulics Division personnel as to the desired measurements; and (2) evaluation of earlier instruments for guidance in providing suitable instruments for securing the measurements. For an evaluation of earlier potamology instrumentation, reference may be made to the reports “Preliminary Development of Instruments for the Measurement of Hydraulic Forces Acting in a Turbulent Stream”, dated June 1948, and “Instrument Evaluation Report No. 2”, dated March 1951. During the 1949-1950 high-water season of the Mississippi River the turbulence study undertaken by the Waterways Experiment Station was further intensified. In line with this study, and at the recommendation of special hydraulic consultants as well as Waterways Experiment Station engineers, it was considered most desirable to measure the turbulence forces near the thalweg as well as at various points along the bank. Manifestations of these forces and the need for the recommended measurements were evident at Reid Bedford Bank during the 1948-1949 high water, where regions of intense turbulence could be seen in areas several hundred feet beyond the instrument installation along the bank as described in the latter reference above. Measurement of these forces wherever they persisted was considered essential to an analysis of the stability of revetted banks. It was recognized that in order to make the measurements, special instruments and operating procedures would be required. The following paragraphs describe the instruments and operational procedures that were followed.
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