Some Hydraulic Aspects During Overflow Above Inflatable Flexible Membrane Dam

Chanson, Hubert (1996) Some Hydraulic Aspects During Overflow Above Inflatable Flexible Membrane Dam. CH47/86, Department of Civil Engineering, The University of Queensland.

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Author Chanson, Hubert
Title Some Hydraulic Aspects During Overflow Above Inflatable Flexible Membrane Dam
School, Department or Centre Department of Civil Engineering
Institution The University of Queensland
Report Number CH47/86
Publication date 1996-05-01
Subject 290501 Mechanical Engineering
291200 Maritime Engineering
260500 Hydrology
291199 Environmental Engineering not elsewhere classified
290899 Civil Engineering not elsewhere classified
290800 Civil Engineering
290801 Structural Engineering
240502 Fluid Physics
260502 Surfacewater Hydrology
290000 Engineering and Technology
291100 Environmental Engineering
291299 Maritime Engineering not elsewhere classified
291899 Interdisciplinary Engineering not elsewhere classified
291800 Interdisciplinary Engineering
300100 Soil and Water Sciences
299901 Agricultural Engineering
290701 Mining Engineering
300199 Soil and Water Sciences not elsewhere classified
290802 Water and Sanitary Engineering
300105 Applied Hydrology (Drainage, Flooding, Irrigation, Quality, etc.)
Abstract/Summary Inflatable flexible membrane dams (IFMD) have been used for the past 40 years in river and coastal engineering applications. In open channels, they are commonly used to raise water levels, to increase water storage or to prevent chemical dispersion. The interest in inflatable dams is increasing because of the ease of placement. Such structures can be installed during later development stages : e.g., to increase the performance of existing facilities (IFMD placed along spillway crest). Despite the increasing interest for IFMD, little information is available on the hydraulic performance of IFMD during overflow periods. Overflow above IFMD may induce some form of fluid-structure interaction, which might cause vibrations of the IFMD structure. Such instabilities might damage or destroy the inflatable dam and they are not acceptable. Overflow situations may occur with deflated or inflated membranes. Both situations are reviewed in the present report. The investigation details the fluid-structure interactions. Several flow instability mechanisms are analysed and the associated hazards are discussed. For overflow situations above inflated dams, the author analyses IFMD without deflector and IFMD with deflector (also called fin). New ideal-fluid flow calculations provide information on the wall pressure distribution along the downstream face of the dam in absence of deflector. The mechanism of flow separation is explained. Jet trajectory calculations are also developed for inflated IFMD with deflector. New information is derived for the optimum design and location of the deflector. Guidelines for future research are discussed at the end. Physical modelling of overflow above IFMD is complex because of the large number of intervening parameters.
Keyword inflatable flexible membrane dams
rubber dams
hydraulic design
fluid-structure interactions
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Additional Notes Hydraulic odel Report Series CH, 60 pages, ISBN 0 86776 644 1.

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