Abstract
The length of hydraulic jump is a parameter needed to design the stilling basin dimension in the downstream of the weir or the other water structure in the river and channel. To determine the hydraulic jump length was needed function with some flow variables associated with the hydraulic jump phenomenon. One of variable to obtain the hydraulic jump was the hydraulic jump length coefficient (Cj). A study to determine the hydraulic jump length coefficient was conducted experimentally in laboratory. The data of experiment result was analyzed by regression technic. The results are the hydraulic jump length coefficient in fixed value and function with variable is a ratio of upstream and downstream depth of the the hydraulic jump.
Highlights
In the case of the waterworks structure construction in the river or canal, so the waterworks will cause the flow pattern in the canal will change
The sketch of the flow pattern in upstream and downstream of the canal gate can be seen in Figure 1a and 1b
As mentioned in above paragraphs that the hydraulic jump length coefficient functions which desired are such as in equation (11) and (12). In those equations Cj is a function of h1/h2 ratio, to find the coefficient and power of the both equations are required regression analysis
Summary
In the case of the waterworks structure construction in the river or canal, so the waterworks will cause the flow pattern in the canal will change. As an example if in the canal has been built a weir or canal gate for irrigation purpose (Figure 1), in upstream and the downstream of the structure the flow parameters will be change. In the upstream exist the slow flow (the flow velocity will be decrease and the flow depth will be increase). In the downstream of the gate the flow velocity will be increase, the flow depth will be decrease, and the flow pattern to be complicated. The hydraulic jump generated in downstream of the gate on flow pattern as Figure 1a or 1b. The sketch of the flow pattern in upstream and downstream of the canal gate can be seen in Figure 1a and 1b
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