3657

3456

كارشناسي ارشد

آب

اصفهان : دانشگاه صنعتي اصفهان ، دانشكده عمران

1386

ده ، 114 [II] ص.: مصور ، جدول ، نمودار

ص. ع. به: فارسي و انگيسي

محمد كريم بيرامي

محمد رضا چمني

5/15/86

عبدالرضا كبيري ، محمود جوان

مهندسي عمران

ID3456

به فارسي و انگليسي : قابل رويت در نسخه ديجيتال

AbstractIn this study characteristics of forced B jumps in stilling basins of an ogee weir with acontinuous sill at the toe of the weir and also with two continuous sills at the weir toe andin the jump are investigated Experiments with one continuous sill showed that byincreasing the sill or by decreasing the sill location from the toe of the sill absorption ofthe energy is high and consequently the sequent depth ratio decreases also the relativeroller length decreases and the energy loss increases Observation of the flow over the sillshowed that flow can divided into four group as 1 free jump 2 undular jump 3 submerged jump and 4 submerged jump with some rollers at the bed zone after the sill In theses experiments by moving the toe of the jump to the higher elevation of the weir effect of sill on decreasing the sequent depth ratio was diminished and because of the bedroller formation after the sill length of the jump roller was also notably decreased Usingtwo small continuous sills in the jump formation showed that the effect of second sill onthe hydraulic characteristics of the jump is not notable In other words the second silldoes not play a roll on the main characteristics of the jump Based on the momentumequation in the horizontal direction a semi theoritical equation for the predicting thesequent depth ratio is presented Using the energy equation and dimensional analyzes theroller length ratio is also estimated The presented methods agree well with the results ofthe experiments

محمد كريم بيرامي

محمد رضا چمني

عبدالرضا كبيري ، محمود جوان