Energy dissipation at block ramps

Pagliara, Stefano; Palermo, Michele

doi:10.1201/b18441-3

Cited by 1 publication

(2 citation statements)

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“…In the current investigation on the gabion stepped weir, five flow regimes were identified. Figure (2) shows the flow regimes in the normal sequence on model N-CS-4 as an example. For small discharges (Drop number<0.0004), a through-flow regime was observed.…”

Section: Experimental Observationsmentioning

confidence: 99%

“…Indeed, the filling material used in its body formation is the most abundant and economical material in hydraulic engineering practice. Gabion structures are considered environmentally friendly structures due to the ecological performance of their porous body [1][2][3]. Furthermore, there is a biochemical reaction due to the decomposition of organic matter by the bacteria inhabiting the rocks' surfaces.…”

Section: Introductionmentioning

confidence: 99%

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Investigation of the Effect of Downstream Slope and Rockfill Materials on Flow Regimes over Gabion Stepped Weirs

Alabas¹,

Jahad²,

Al-Ameri³

et al. 2023

Pol. J. Environ. Stud.

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It is important to determine the limits of flow regimes in the design of stepped weirs because of the hydraulic performance of each regime. The present study investigates the effect of downstream slope and rock fill materials on flow regimes in gabion stepped weirs. Nine physical models of gabion weirs were used in the experiments. The models' downstream slopes ranged from 1:05 to 1:4 V:H. In addition, two types of rockfill materials: crushed stone of 0.42 porosity and rounded gravel of 0.38 porosity were used to study the effect of rockfill materials on flow regimes. The nominal size of the crushed stone was (37.5 mm -13.2 mm) D50 = 23 mm and the nominal size of the rounded gravel was (26.5 mm -13.2 mm) D50 = 16 mm. Each model has been tested with ten runs for discharge per unit width ranging (from 0.006 to 0.105 m 3 /sec. m) to cover all flow conditions and flow regimes. The onset of each flow regime for all physical models has been observed. The experimental data of the gabion stepped weirs have been used to develop equations to estimate the onset of each flow regime. The coefficient of correlation (R) of the developed equations ranged between 0.95 to 0.97. The results indicated on the steeper downstream slope models (1:0.5, 1:0.83), there is interference between the nappe and transition flow regimes. The nappe flow regime has not appeared on all steps at the same

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Section: Experimental Observationsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%