An Experimental Study On The Effect Of Oxygen Increase On Outflow Under Gates In The Channel

Based on the theory of oxygen transfer,hydraulic jump could increase the contact area of water-gas,so it could increase the dissolved oxygen value of water.Compared with the plank,broad-crested weir and weir shaped in curve,we do research the effect on different condition concerning about flowing through the opening gate.We got the conclusion below:1.Without the ridge,it has a high degree of efficiency on increasing the dissolved oxygen with the e ascends when e/H is a C.What’s more,e/H is a smaller value and the effect of increasing the dissolved oxygen is better when the value of e is a constant.2.When water go through the broad-crested weir,the effect of increasing the dissolved oxygen value has a positive correlation with the increase of the e/H.When the H is a constant,the effect is supreme.And the effect goes through the limitation with an increase of e.The value is evident when the range of e is between 2cm and 3cm.What’s more,Length will also lead to the effect of dissolved oxygen.And the effect is optimistic when the Length is 0.5 cm.3.When the weir is in the shape of curve,e will lead the variation of the volume of dissolved oxygen.When e transfers to the 3cm,the effect of dissolved oxygen is stable.Noticeable,when the value of K is constant,there is a negative correlation when the Length is increasing.And via the sill,there is an increase of volume of dissolved oxygen,approximately 5 percentage.4.It is attainable that we could get the equation and image via the program called Rgui.And combining two uncorrelated sectors,it is convenient to get an equation,DO=1.118-0.254L~2+0.221~2-0.002-0.183.When K=0.41 L=0,the volume of dissolved oxygen is maximum.