The Study of Hydraulic Properties of Quarter-Circular Crested Stepped Spillway

نوع مقاله : مقاله پژوهشی

نویسندگان

1 Former PhD candidate of Hydro-Structure Engineering, Water Engineering Department, Lorestan University and Assistant Professor of Shahid Chamran University of Ahvaz. Iran.

2 Professor, Water Engineering Department, Lorestan University, Khorramabad, Iran.

3 Associate Professor, Soil Conservation and Watershed Management Institute, Tehran, Iran.

4 Lorestan University

چکیده

In this paper, the quarter-circular crested stepped spillway (QCSS) is introduced and its hydraulic properties including the discharge coefficient (Cd) and energy dissipation of flow are investigated. The QCSS consists of a quarter-circular as the crest and a stepped chute. The Cd of QCSS variates between 0.9 and 1.4 considering the range of relative upstream head (hup/R) between 0.1 and 1.0, but at the same range of hup/R, the Cd of the broad crested stepped spillway (BCSS) changes between 0.9 and 1.0. The ratio of energy dissipation changes between 30% and 98% for both hydraulic models. Comparing the performance of QCSS and BCSS shows that in the skimming flow condition, the Cd of QCSS is about 30%more than the BCSS. Whereas, in the same flow regime, the energy dissipation of the flow on QCSS is a bit less than the BCSS about 10%.

کلیدواژه‌ها

موضوعات


عنوان مقاله [English]

The Study of Hydraulic Properties of Quarter-Circular Crested Stepped Spillway

نویسندگان [English]

  • Abbas Parsaie 1
  • AmirHamzeh Haghiabi 2
  • Mojtaba Saneie 3
  • Hasan Torabi 4
1 Former PhD candidate of Hydro-Structure Engineering, Water Engineering Department, Lorestan University and Assistant Professor of Shahid Chamran University of Ahvaz. Iran.
2 Professor, Water Engineering Department, Lorestan University, Khorramabad, Iran.
3 Associate Professor, Soil Conservation and Watershed Management Institute, Tehran, Iran.
4 Assistant Professor, Water Engineering Department, Lorestan University, Khorramabad, Iran.
چکیده [English]

In this paper, the quarter-circular crested stepped spillway (QCSS) is introduced and its hydraulic properties including the discharge coefficient (Cd) and energy dissipation of flow are investigated. The QCSS consists of a quarter-circular as the crest and a stepped chute. The Cd of QCSS variates between 0.9 and 1.4 considering the range of relative upstream head (hup/R) between 0.1 and 1.0, but at the same range of hup/R, the Cd of the broad crested stepped spillway (BCSS) changes between 0.9 and 1.0. The ratio of energy dissipation changes between 30% and 98% for both hydraulic models. Comparing the performance of QCSS and BCSS shows that in the skimming flow condition, the Cd of QCSS is about 30%more than the BCSS. Whereas, in the same flow regime, the energy dissipation of the flow on QCSS is a bit less than the BCSS about 10%.

کلیدواژه‌ها [English]

  • Circular Crested Weir
  • Cascade Weir
  • Discharge Coefficient
  • Flow Measurement
  • Energy dissipation
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