| Abstrakt: |
Changes in river morphology are intimately related to the flow phenomenon at river bends. These changes affect the scouring of cliffs along river bends. Groyne installation is simply one of many steps to lessen scouring frequency. The Groyne is a riverside structure that regulates water flow and protects the river bend wall. This study assesses how installing an impermeable groyne affects the amount of scour and how shifting the angle and distance at which such a groyne is installed affects the amount of scour mitigated at river bends. The lab tested open channel flow models through their paces with varying installation angles (45°, 90°, and 135°) and Groyne distances (5 cm, 10 cm, and 15 cm). The investigation results indicated that Groyne was not used in 56% of the scouring operations. For a distance of 5 cm, there was 21%, 13%, and 5% scour at 45°, 90°, and 135° from the sphere's center, respectively. The percentages of scour at 45°, 90°, and 135° off-center are 33%, 28%, and 17%, respectively, when measured at a distance of 10 cm. Scour percentages at 45°, 90°, and 135° with a 15-cm distance were 38%, 30%, and 21%, respectively. As a result, installing the Groynes at a 135° angle and spacing them 5 cm apart results in the least amount of scouring; a 45° installation angle and 15 cm Groyne spacing results in the highest percentage. Accordingly, the scouring degree is inversely proportional to the angle at which the Groyne was installed. In contrast, the amount of scouring is proportional to the distance between the grooves. [ABSTRACT FROM AUTHOR] |
