Scour under Structures

Scour under StructuresTERM PAPER PRESENTATIONOE5800:: COASTAL ENGINEERINGHARIKRISHNAN VSRINIJA ATEJASREE D IntroductionScour is the removal by hydrodynamic forces, of granular bed material in the vicinity of a coastal structure.Unlike erosion, it requires presence of the structure.It occurs where sediment is eroded from an area of the seabed due to the forces by waves and currents.scour is a threat to the stability of coastal structures such as piles, breakwaters, seawalls, etc.

Categories of scourGeneral scourLocal scourGlobal or dishpan scourConstriction scourOverall seabed movementLocal and Global ScourLocal scour occurs around the individual structural elements.Global scour occurs beneath and around the structure.

Common scour problems

Physical Processes Of ScourWhen fluid flow meets a structure:

Flow seperationLee-wake vorticesHorse shoe vortexStreamline contractionLocal accelerationShear stress on seabedScour

Scour occurs when Shear strength of soil