انجمن هیدرولیک ایران نشریه علمی هیدرولیک 2345-4237 7 3 2012 10 22 Investigation of the Effect of Roughness Wave Length on the Hydraulic Jump Characteristics of Roughened bed بررسی تغییرات ویژگی های پرش هیدرولیکی بر روی بستر زبر نسبت به تغییرات طول موج زبری ها 33 42 85347 10.30482/jhyd.2012.85347 FA محمد بزاز بهزاد قربانی دانشیار گروه مهندسی آب، دانشگاه شهرکرد محمود اسکینی Journal Article 2012 03 20 In this study, variation of hydraulic jump characteristics including jump length and secondary depth<br />and the variation of the effective length of roughness in relation to the wave length were studied. For<br />this purpose, the characteristics of hydraulic jump under four different wave lengths and four different<br />Froude numbers were experimentally determined. Totally, 84 tests have been carried out in the range<br />of Froude numbers from 5.84 to10.13 in a flume with length of 12 m , width of 40 cm, and height of<br />40 cm. The results showed that the characteristics of hydraulic jump such as length of jump and<br />secondary depth declines as the length of roughness increases. It was also found that, the effective<br />roughness length on the secondary depth increases as the wave length increases, but the effect of<br />roughness length on the length of jump is reverse. Regarding the derived relationships, the optimum<br />dimensionless wave length was obtained to be 4.5. https://jhyd.iha.ir/article_85347_923fd87995c88091a2c7118be00321d9.pdf