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Experiments of Hydraulic Mechanics and Local Scour Characteristics around the Tilted-Single Plant
turbulent kinetic energy
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In recent years, the heavy rainfall converges into river in the watershed and becomes the flooding because of the extreme weather. In Taiwan there are lots of economic crops in floodplain, such as banana and sugar cane. The flood induces the crops to tilt. The tilt crops change the form of riverbed and the flow condition. The study investigated the scour hole, the flow field, and the turbulent kinetic energy (TKE) around the tilt single plant. The experiment used the stainless steel tube to simulate the situation that the plant is affected by flow. Results of an experimental study on clear-water scour at a control set and three different angles (tube with bed; degree of 90, 60, and 45) of the bended tube in uniform bed sediments under steady flow are presented. The velocity field around the tube was measured by Acoustic Doppler Velocimeter (ADV), and we also measured the topography of scour holes by laser range finder. According to the experimental results, the depth and volume of scour hole is consider with the angle when the tube became more tilt. A jet flow after the flow leaving the tube because the flow was clamped by the tube, and the cast-off vortices and wake was also clamp down by the tube. The vertical and streamwise velocity was extremely unstable around the tube. The maximum of TKE occurred around the tube of the set 45 degrees, the value is about 19, and the high TKE area around the tube, the value is roughly 3 to 18 in all sets. TKE distributed along the tube, when the tube gets more tilt, TKE becomes more stretching. In the flow conditions of this study, TKE exists at roughly 2 to 3cm around the tube. Therefore, the experimental results demonstrate that the tube became more tilt, the fewer effect reflect on riverbed. TKE related with flow condition, and TKE’s distribution changes with the tube.
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