CALCULATION OF CRITICAL DEPTH IN OPEN COMPOUND CROSS SECTIONS CONSIDERING MOMENTUM TRANSFER EFFECT

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KORDI E.; AYOUBZADEH SEYED ALI; ZIATABAR AHMADI M.KH.; ZAHIRI A.A.R.

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Journal: Journal of Agricultural Sciences and Natural Resources Year:2007 | Volume:14 | Issue:4 Page(s): 220-231

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Information Journal Paper

Title

CALCULATION OF CRITICAL DEPTH IN OPEN COMPOUND CROSS SECTIONS CONSIDERING MOMENTUM TRANSFER EFFECT

Author(s)

KORDI E. | AYOUBZADEH SEYED ALI | ZIATABAR AHMADI M.KH. | ZAHIRI A.A.R. | Issue Writer Certificate

Keywords

COMPOUND CROSS SECTIONQ2

CRITICAL DEPTHQ2

CROSS SECTION SEPARATION METHODQ3

COHERENCEQ3

CORRECTED ONE-DIMENSIONAL METHODQ3

Abstract

In hydraulic analysis of open COMPOUND CROSS SECTIONs, the calculation of the CRITICAL DEPTH is very important. There are different methods for estimating the number and amount of CRITICAL DEPTHs such as unit cross section, the conventional method with separation of cross section, energy method, momentum method and weighted Froude Number method. In all these methods the momentum transfer effect resulting from occurrence of cross gradient of velocity between main cross section and flood plains are not considered. This phenomenon, which is described as interaction effect, is ambiguous and complicated and the results of the works of researchers have not ended to the introducing and proposing of a practical and comprehensive method for design and investigation about COMPOUND CROSS SECTION yet. The conventional method calculates average velocities higher in main cross section and lower in flood plains than real values. In this paper, the CORRECTED ONE-DIMENSIONAL METHOD for estimation of CRITICAL DEPTH was introduced the interaction effect is considered. In this study, the average flow velocity in main cross section and flood plain and consequently partial and total discharge rates have been corrected using the COHERENCE method. Results showed that the conventional method with separation of cross section gives higher CRITICAL DEPTH and specific energy. This increase depends on geometry and hydraulic condition of flow, and varies from few millimeters in small scale laboratory to tens of centimeter in the rivers. The variation range in minimum specific energy is higher than in CRITICAL DEPTH.

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APA: Copy

KORDI, E., AYOUBZADEH, SEYED ALI, ZIATABAR AHMADI, M.KH., & ZAHIRI, A.A.R.. (2007). CALCULATION OF CRITICAL DEPTH IN OPEN COMPOUND CROSS SECTIONS CONSIDERING MOMENTUM TRANSFER EFFECT. JOURNAL OF AGRICULTURAL SCIENCES AND NATURAL RESOURCES, 14(4), 220-231. SID. https://sid.ir/paper/9332/en

Vancouver: Copy

KORDI E., AYOUBZADEH SEYED ALI, ZIATABAR AHMADI M.KH., ZAHIRI A.A.R.. CALCULATION OF CRITICAL DEPTH IN OPEN COMPOUND CROSS SECTIONS CONSIDERING MOMENTUM TRANSFER EFFECT. JOURNAL OF AGRICULTURAL SCIENCES AND NATURAL RESOURCES[Internet]. 2007;14(4):220-231. Available from: https://sid.ir/paper/9332/en

IEEE: Copy

E. KORDI, SEYED ALI AYOUBZADEH, M.KH. ZIATABAR AHMADI, and A.A.R. ZAHIRI, “CALCULATION OF CRITICAL DEPTH IN OPEN COMPOUND CROSS SECTIONS CONSIDERING MOMENTUM TRANSFER EFFECT,” JOURNAL OF AGRICULTURAL SCIENCES AND NATURAL RESOURCES, vol. 14, no. 4, pp. 220–231, 2007, [Online]. Available: https://sid.ir/paper/9332/en

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