Abstract
In order to reduce the local scour before the antiscour device of piers, this paper proposed an improvement on a “V-type” device. That was to say, wing plates were set on the surface of the “V-type” device to enhance the diversion and reduce the local scour. To explore the protection effect of the modified device, the inclination angles of the wing plates were set to three angles, and the scour characteristics around the device were studied through the flume scour test and numerical simulation test. The results showed that the wing plates can reduce the impact force of the diving flow which was at the front end of the protective device. Besides, they could also disturb the flow around both sides of the device and weaken its sediment carrying capacity. Thus, the local scour around the device was effectively reduced. Especially, when the wing plates were 30°, the performance of reducing the local scour was the best.
Highlights
Ey disturbed the upward flow at the front end and both sides of the device and separated the diving flow on the upstream surface, so as to weaken the eddy current system
E inlet section was 0.2 m long, the inlet transition section was 0.7 m long, the test section was 1.2 m long, the outlet transition section was 0.5 m long, and the backwater area was 0.4 m long. e current meter was arranged in front of the pier to monitor the flow rate; the test flow rate was 0.20 m/s. e model pier was PVC pipe with a diameter of 4 cm and height of 40 cm. e protective device was placed 3.5 d away from the pier center
At the front end measuring point, when the inclination angles of wing plates changed from 0° to 30°, the simulated values scour depth decreased from 2.5 cm to 2.1 cm, and the test values scour depth decreased from 1.8 cm to 1.5 cm, and the changes of scour depth of the left and right end measuring points were similar
Summary
0.03 cm thick sheet iron with the size of 30 cm × 8 cm was folded into the protective device along the short side. E protective device had an angle of 60°, a height of 3 h/4 (h denotes the water depth), and a width of wing plates is 9 d/40 (d denotes the pier diameter). E modified protective devices had two rows of wing plates on the upstream surface, and the inclination angles of the wing plates were designed as 0°, 15°, and 30°
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