EVALUATING THE AFFECTION OF USED MATERIAL POROSITY ON ENERGY DISSIPATION IN GABION STEPPED WEIRS

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AZIZI A.; MEFTAH HALAGHI M.; ZIATABAR AHMADI M.KH.; GOLMAEI S.H.

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Journal: Journal of Agricultural Sciences and Natural Resources Year:2008 | Volume:15 | Issue:1 Page(s): 150-158

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Title

EVALUATING THE AFFECTION OF USED MATERIAL POROSITY ON ENERGY DISSIPATION IN GABION STEPPED WEIRS

Author(s)

AZIZI A. | MEFTAH HALAGHI M. | ZIATABAR AHMADI M.KH. | GOLMAEI S.H. | Issue Writer Certificate

Keywords

STEPPED GABION WEIRSQ3

ENERGY DISSIPATIONQ2

POROSITYQ2

DIMENSIONLESS EQUATIONQ3

Abstract

Gabion weirs and specially stepped gabion spillways are structurally stable and efficient energy dissipaters with a wide application in hydraulic engineering. Since flow equations in porous media such as stones are difficult to solve, estimation of ENERGY DISSIPATION and structure behavior as a function of effective parameters using physical models seems rational. Energy dissipation with stepped gabion spillways is a function of up and down slope inclinations, POROSITY and drop number (as a function of flow). A change in POROSITY affects the ratio of inflow to over-flow, affecting energy loss. A considerable reduction in energy loss ratio was observed with increasing POROSITY, above 38 percent specially, using twelve physical models with two parameters, including four porosities (30, 34, 38 and 42 percent) and three inclinations. The inflow to overflow ratio is increased with increasing POROSITY, indicating the energy loss with flow over the steps is greater relative to friction with stones, contrary to a reduction in inflow friction loss with the increasing POROSITY. With 1:1, 1:2 and 1:3 Weirs down slope inclinations and different inflow rates from 10~40 lit/s, four equations were obtained for the combined effect of all parameters on the ratio of energy loss using SPSS and SAS soft wares in this research. The results indicate that the POROSITY is more efficient than downstairs slope on ENERGY DISSIPATION. With decreasing the POROSITY, the energy loss increase and from POROSITY=38%, the energy loss increase much more.

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APA: Copy

AZIZI, A., MEFTAH HALAGHI, M., ZIATABAR AHMADI, M.KH., & GOLMAEI, S.H.. (2008). EVALUATING THE AFFECTION OF USED MATERIAL POROSITY ON ENERGY DISSIPATION IN GABION STEPPED WEIRS. JOURNAL OF AGRICULTURAL SCIENCES AND NATURAL RESOURCES, 15(1), 150-158. SID. https://sid.ir/paper/9591/en

Vancouver: Copy

AZIZI A., MEFTAH HALAGHI M., ZIATABAR AHMADI M.KH., GOLMAEI S.H.. EVALUATING THE AFFECTION OF USED MATERIAL POROSITY ON ENERGY DISSIPATION IN GABION STEPPED WEIRS. JOURNAL OF AGRICULTURAL SCIENCES AND NATURAL RESOURCES[Internet]. 2008;15(1):150-158. Available from: https://sid.ir/paper/9591/en

IEEE: Copy

A. AZIZI, M. MEFTAH HALAGHI, M.KH. ZIATABAR AHMADI, and S.H. GOLMAEI, “EVALUATING THE AFFECTION OF USED MATERIAL POROSITY ON ENERGY DISSIPATION IN GABION STEPPED WEIRS,” JOURNAL OF AGRICULTURAL SCIENCES AND NATURAL RESOURCES, vol. 15, no. 1, pp. 150–158, 2008, [Online]. Available: https://sid.ir/paper/9591/en

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