LOCAL SCOUR DUE TO RECTANGULAR JET DOWNSTREAM OF FLIP-BUCKET SPILLWAYS WITH NO UNIFORM BED SEDIMENT

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MOMENI VESALIAN R.; MOUSAVI JAHROMI S.H.; SHAFAEI BAJESTAN MAHMOUD

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Paper Information

Journal: Journal of Agricultural Sciences and Natural Resources Year:2008 | Volume:15 | Issue:2 Page(s): 203-216

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Title

LOCAL SCOUR DUE TO RECTANGULAR JET DOWNSTREAM OF FLIP-BUCKET SPILLWAYS WITH NO UNIFORM BED SEDIMENT

Author(s)

MOMENI VESALIAN R. | MOUSAVI JAHROMI S.H. | SHAFAEI BAJESTAN MAHMOUD | Issue Writer Certificate

Keywords

SCOURINGQ1

FALLING JETQ3

RECTANGULAR JETQ3

FLIP-BUCKETQ2

ENERGY DISSIPATERQ3

Abstract

Bucket spillways are used at the end of high dam spillways due to low cost compare to other types of ENERGY DISSIPATER structures. Impingement of FALLING JET on the river bed can create scour hole which can cause damage to the spillways, dams body or nearby structures. Accumulation of sediment downstream of scour hole can increase the tailwater and reduce the hydropower generation. Therefore it is important to predict the scour depth when using flip bucket as ENERGY DISSIPATER. The purpose of this study is to conduct experimental tests to understand the mechanism of this phenomenon and to develop relationships for predicting the scour holes dimensions. To reach these goals, at first by dimensional analysis, general relation was developed. The maximum depth of scour holes was found as a function of variable containing discharge, jet thickness, height of falling, particle size and densimetric froude number (SN), which is the ratio of the total active force to the total resistance force acting on a single particle. Then an extensive experimental program was conducted under different size materials and flow conditions. Using the experimental data, different models were examined and the best models were selected. The best models for predicting the maximum scour hole were achieved with variables of discharge, height of falling and particle size. No accurate models were achieved to predict the height of point bar upstream and downstream of scour hole. Finally, these models were tested by applying experimental data from other investigators and it was found that the models presented in this paper can predict the scour depth accurately.

Cites

SCALING AND SPATIAL ANALYSIS OF INFILTRATION AT THE REGIONAL SCALE (CASE STUDY: THE SHAHREKORD WATERSHED)

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APA: Copy

MOMENI VESALIAN, R., MOUSAVI JAHROMI, S.H., & SHAFAEI BAJESTAN, MAHMOUD. (2008). LOCAL SCOUR DUE TO RECTANGULAR JET DOWNSTREAM OF FLIP-BUCKET SPILLWAYS WITH NO UNIFORM BED SEDIMENT. JOURNAL OF AGRICULTURAL SCIENCES AND NATURAL RESOURCES, 15(2), 203-216. SID. https://sid.ir/paper/9650/en

Vancouver: Copy

MOMENI VESALIAN R., MOUSAVI JAHROMI S.H., SHAFAEI BAJESTAN MAHMOUD. LOCAL SCOUR DUE TO RECTANGULAR JET DOWNSTREAM OF FLIP-BUCKET SPILLWAYS WITH NO UNIFORM BED SEDIMENT. JOURNAL OF AGRICULTURAL SCIENCES AND NATURAL RESOURCES[Internet]. 2008;15(2):203-216. Available from: https://sid.ir/paper/9650/en

IEEE: Copy

R. MOMENI VESALIAN, S.H. MOUSAVI JAHROMI, and MAHMOUD SHAFAEI BAJESTAN, “LOCAL SCOUR DUE TO RECTANGULAR JET DOWNSTREAM OF FLIP-BUCKET SPILLWAYS WITH NO UNIFORM BED SEDIMENT,” JOURNAL OF AGRICULTURAL SCIENCES AND NATURAL RESOURCES, vol. 15, no. 2, pp. 203–216, 2008, [Online]. Available: https://sid.ir/paper/9650/en

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