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Investigation of low cost hydraulic structures using rock protected slopes

Investigation of low cost hydraulic structures using rock protected slopes
Investigation of low cost hydraulic structures using rock protected slopes

Weirs formed of earth or river bed material with upstream and downstream faces protected by tipped rocks appear to be an economically viable form of construction in certain areas of the world. A number of experimental investigations have been carried out to observe and define the failure mode of such weirs which seems to confirm that the failure occurs on the downstream slope close to the point where flow has accelerated to its maximum velocity. In the present investigation the flow over downstream rock protected slope and the stability of the rock protection have been studied. Five hydraulic models have been built and tested in the laboratory flumes. The first, second, and the third models were used for the failure and scour tests. The fourth model was used for the flow characteristics, turbulence and hydraulic resistance studies, and both the fourth and fifth models were used for the measurements of the hydrodynamic forces acting on a bed particle with and without the seepage effects. Detailed velocity distributions with their time fluctuations over the entire depth of flow at different locations along the surface of the rock protection were obtained for the turbulence and hydraulic resistance studies. Also detailed measurements for the hydrodynamic forces with their time fluctuations acting on the selected bed particle were obtained, analyzed, and used in formulating the stability criteria. The seepage through the core of the structure was found to have no effect on the stability of the protection layer and the structure as a whole. Computer programs for the stability analysis and the design have been developed utilizing the experimental results and the formulated stability criteria, based on a stochastic approach using a computer model for simulating the instantaneous values of the forces. All results were compared with the work of previous investigators, also the derived stability criteria confirmed experimentally. (D72242/87)

University of Southampton
Putrus, Putrus Khadouri
Putrus, Putrus Khadouri

Putrus, Putrus Khadouri (1986) Investigation of low cost hydraulic structures using rock protected slopes. University of Southampton, Doctoral Thesis.

Record type: Thesis (Doctoral)

Abstract

Weirs formed of earth or river bed material with upstream and downstream faces protected by tipped rocks appear to be an economically viable form of construction in certain areas of the world. A number of experimental investigations have been carried out to observe and define the failure mode of such weirs which seems to confirm that the failure occurs on the downstream slope close to the point where flow has accelerated to its maximum velocity. In the present investigation the flow over downstream rock protected slope and the stability of the rock protection have been studied. Five hydraulic models have been built and tested in the laboratory flumes. The first, second, and the third models were used for the failure and scour tests. The fourth model was used for the flow characteristics, turbulence and hydraulic resistance studies, and both the fourth and fifth models were used for the measurements of the hydrodynamic forces acting on a bed particle with and without the seepage effects. Detailed velocity distributions with their time fluctuations over the entire depth of flow at different locations along the surface of the rock protection were obtained for the turbulence and hydraulic resistance studies. Also detailed measurements for the hydrodynamic forces with their time fluctuations acting on the selected bed particle were obtained, analyzed, and used in formulating the stability criteria. The seepage through the core of the structure was found to have no effect on the stability of the protection layer and the structure as a whole. Computer programs for the stability analysis and the design have been developed utilizing the experimental results and the formulated stability criteria, based on a stochastic approach using a computer model for simulating the instantaneous values of the forces. All results were compared with the work of previous investigators, also the derived stability criteria confirmed experimentally. (D72242/87)

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Published date: 1986

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Local EPrints ID: 460819
URI: http://eprints.soton.ac.uk/id/eprint/460819
PURE UUID: d7c28565-0b7b-4f08-9089-b1a3a0492305

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Date deposited: 04 Jul 2022 18:30
Last modified: 04 Jul 2022 18:30

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Author: Putrus Khadouri Putrus

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