Laboratory comparison of hydraulic jump models in different flow regimes

Stilling basin plays an important role in the energy dissipation of hydraulic structures. In this study, five hydraulic jump models that have shown good results in certain laboratory conditions, are compared. 32 tests in Froude numbers ranging from 1.02-9.19 with three roughness and three slopes and minimum three discharges are done. Selected beds include a smooth bed, a bed with 1.6 mm roughness and bed with a roughness of 3.6 mm. The results showed that reviewed models have errors in hydraulic jump length prediction at different flow regimes. In hydraulically smooth flow, minimum error is 16 percent for the Parsamehr et al model. All models have high error in hydraulically transitional flow but if needed, can be used the model of Mohseni movahhed et al. with an error 53.7 percent. In hydraulically rough flow rough, none of the models have low error but mohseni movahed model with 57 percent error is more usable.