Abstract
Dissipation basins are usually constructed downstream of spillways to dissipate energy, causing large pressure fluctuations underneath hydraulic jumps. Little systematic experimental investigation seems available for the pressure parameters on the bed of the US Department of the Interior, Bureau of Reclamation (USBR) Type II dissipation basins in the literature. We present the results of laboratory-scale experiments, focusing on the statistical modeling of the pressure field at the centerline of the apron along the USBR Type I and II basins. The accuracy of the pressure transducers was ±0.5%. The presence of accessories within basinII reduced the maximum pressure fluctuations by about 45% compared to basinI. Accordingly, in some points, the bottom of basinII did not collide directly with the jet due to the hydraulic jump. As a result, the values of pressure and pressure fluctuations decreased mainly therein. New original best-fit relationships were proposed for the mean pressure, the statistical coefficient of the probability distribution, and the standard deviation of pressure fluctuations to estimate the pressures with different probabilities of occurrence in basinI and basinII. The results could be useful for a more accurate, safe design of the slab thickness, and reduce the operation and maintenance costs of dissipation basins.
Highlights
IntroductionHydraulic jump with the turbulent entrainment process is a function of time and position
Hydraulic jump with the turbulent entrainment process is a function of time and position.This phenomenon is a complex and stochastic process, so that hydrodynamic pressure fluctuations can be analyzed using statistical methods
Energy dissipation through the hydraulic jumps with the conversion of energy downstream of spillways is usually confined within the dissipation basins [1]
Summary
Hydraulic jump with the turbulent entrainment process is a function of time and position This phenomenon is a complex and stochastic process, so that hydrodynamic pressure fluctuations can be analyzed using statistical methods. Energy dissipation through the hydraulic jumps with the conversion of energy downstream of spillways is usually confined within the dissipation basins [1]. Due to the large heads upstream of spillways, dissipation basins may be subjected to enormous instantaneous pressure and velocity fluctuations, causing significant stresses in such energy dissipators. This may cause the uplift of a basin lining, making it necessary to provide this structure with sufficient weight or anchorage. Through the analysis of collected data, it is possible to characterize the forces under a hydraulic jump according to the values of mean pressures, pressure fluctuations, and extreme pressures [2]
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