University of TehranIranian Journal of Soil and Water Research2008-479X47420161221Evaluate and develop new relationships to estimate submerged hydraulic jump characteristicsEvaluate and develop new relationships to estimate submerged hydraulic jump characteristics7557645998210.22059/ijswr.2016.59982FAAminGhassemiMohammad HoseinOmid0000-0003-4684-3970MohsenNasrAbadiAliRaeesi EstabraghJournal Article20160112In this research, in order to develop new relationships with reasonable accuracy for estimation of the submerged hydraulic jump characteristics, a study has been conducted experimentally. Experiments have been done in a rectangular channel with a length of 9 m, a width of 0.5 m and a depth of 0.45 m. Froude numbers in these tests range from 3.5 to 11.5 and between submergence ratios of 0.1 to 4. According to the results, the water surfaces profiles have been obtained in different Froude numbers and submergence ratios. Also, some relationships with high accuracy to estimate such characteristics as jump length, submerged depth on the gate, and the relative energy loss have been developed. The results also showed that, in a given Froude number, length and relative energy loss for submerged hydraulic jump are, respectively, more and less than those for free hydraulic jumps. In addition, for submerged hydraulic jump, at a given Froude number, by increasing the submergence ratio, the jump length and submergence depth on the gate increases and relative energy loss decreases. Finally, using sensitivity analysis technique, the effectiveness of dominant parameters on the developed expressions on the changes in submergence depth on the gate parameters and relative energy loss has been determined.In this research, in order to develop new relationships with reasonable accuracy for estimation of the submerged hydraulic jump characteristics, a study has been conducted experimentally. Experiments have been done in a rectangular channel with a length of 9 m, a width of 0.5 m and a depth of 0.45 m. Froude numbers in these tests range from 3.5 to 11.5 and between submergence ratios of 0.1 to 4. According to the results, the water surfaces profiles have been obtained in different Froude numbers and submergence ratios. Also, some relationships with high accuracy to estimate such characteristics as jump length, submerged depth on the gate, and the relative energy loss have been developed. The results also showed that, in a given Froude number, length and relative energy loss for submerged hydraulic jump are, respectively, more and less than those for free hydraulic jumps. In addition, for submerged hydraulic jump, at a given Froude number, by increasing the submergence ratio, the jump length and submergence depth on the gate increases and relative energy loss decreases. Finally, using sensitivity analysis technique, the effectiveness of dominant parameters on the developed expressions on the changes in submergence depth on the gate parameters and relative energy loss has been determined.https://ijswr.ut.ac.ir/article_59982_c690e6c97bfb6549a6adf8c58f7ef8a2.pdf