Scour control around Submerged pipeline on the river bed using an impermeable Spoiler

Abstract

Through experiments in a straight Plexiglass flume, the scour control performance of a spoiler installed under a submerged pipe laid on the river bed was studied. The experiments were carried out with four different pipe sizes, four variable flow rates, and four spoiler widths under clear-water conditions. The results were suggestive of the efficiency of the attached spoiler in reducing the length but increasing the depth of scour. On average, the incorporation of the spoiler shrunk the scour under the pipe by 21% in length while making it approximately 22% deeper. Furthermore, with both the pipe and the spoiler under it, the maximum increase in the scour depth 55% was obtained with a relative width of 0.26 and a pipe diameter of 4.8 cm at Fr = 0.42. The statistical software package SPSS was employed to formulate Equations Was obtained based on a linear regression between the maximum scour depth and length.

Keywords

• Froudenumber
• Scour depth
• Spoiler
• Submerged pipe