Check dam is a small dam constructed across a stream which is mostly the steep one as sketched in Figure 1a). Series of

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Check Dam Is A Small Dam Constructed Across A Stream Which Is Mostly The Steep One As Sketched In Figure 1a Series Of 1 (62.83 KiB) Viewed 15 times

Check Dam Is A Small Dam Constructed Across A Stream Which Is Mostly The Steep One As Sketched In Figure 1a Series Of 2 (52.67 KiB) Viewed 15 times

Check dam is a small dam constructed across a stream which is mostly the steep one as sketched in Figure 1a). Series of check dams are used in an engineering purpose to control channelized debris flow frequency and volume. In order to study the flow behavior, the tests of flow through series of check dams can be done in the lab with the sketch, shown in Figure 1b). The channel is 0.4 m wide, 0.6 m deep and 6.0 m long. Five dams are installed along the channel and the collected data is averaged from these five scour holes. At first, the check dams are embedded into the initial stream bed with slope of So. The dam spacing, L, can be varied. The various flow rates, Q, have been tested. After a while, the flow is steady and the scour holes are appeared. The equilibrium stream bed, as shown in Figure 1c) can be found. The dimensions of scour depth, ys, and scour length, Is, are collected. The collected data is as shown in Table 1. After the tests are done, the experimenter found that the scour depth, y, can be varied because of; - Initial stream bed slope, So - Dam spacing, - Flow rate, Q - Water density, P - Sediment diameter, d, - scour length, is - Water viscosity, u Determine dimensionless terms and propose the empirical equation for the scour depth prediction. State the reason for proposing this equation

b) Experimental setup before testing Check dam L a) longitudel hot dele de c) Test result Figure 1 Series of check dams Table 1 Collected data Run s, (m/m) L y No. р (kg/m) 998 1 (m) (m) d. (m) 0.001 (m) 1 0.176 0.4 (kg/m-s) 0.001 0.001 0.107 Q (m/s) 0.001467 0.004076 0.000803 0.003066 0.211 2 0.176 0.4 998 0.001 0.138 0.27 3 0.176 0.4 . 998 0.001 0.001 0.089 0.18 4 0.176 0.4 998 0.001 0.001 0.131 0.253 5 0.176 0.4 0.001188 998 0.001 0.001 0.102 0.197 6 0.176 0.6 998 0.001 0.17 0.325 7 0.176 0.6 0.003066 0.00172 0.000762 998 0.001 0.001 0.001 0.14 0.001 0.001 0.253 8 0.176 0.6 0.11 0.208 998 998 9 0.176 0.6 0.002376 0.001 0.001 0.16 0.28 10 0.176 0.6 0.004646 998 0.001 0.001 0.183 0.357