Please use this identifier to cite or link to this item:
Title: Turbulent flow near an oscillating wall
Authors: University of California, Berkeley. Wave Research Laboratory
United States. Army. Office of the Chief of Engineers
Kalkanis, George
Keywords: Sediment transport
Two-phase flow
Wave action
Oscillating flow
Issue Date: Jul-1957
Publisher: United States, Beach Erosion Board
Engineer Research and Development Center (U.S.)
Series/Report no.: Technical memorandum (United States. Beach Erosion Board) ; no. 97.
Description: Technical Memorandum
From the Introduction: It has been noticed long ago and it is a matter of common knowledge that sediment transport occurs near the beaches of oceans and lakes. This motion has components toward and along the coast and is attributed to the action of the waves. Moreover, recent observations reveal that a considerable amount of sediment movement occurs at localities far beyond the surf zone at depths up to sixty feet and more. An accurate estimate of the transport is very valuable to the successful handling of coastal projects. Laboratory studies have proved that the main cause of motion in this case is again the action of the surface waves. The sand grains which constitute this transport move near or on the bottom in a similar way to the bed load in the case of unidirectional flow. Extensive studies dealing with the latter case proved the existence of a relationship between the flow near the bottom and the movement of the sediment. The modern theories of bed load motion are based on the condition of instantaneous equilibrium between the hydrodynamic and the gravitational forces acting upon the individual grains. (3)(5)* It is reasonable to expect that a similar relationship should also exist in the pre sent case where the flow is not unidirectional, but oscillatory. Our problem thus calls for the derivation of a law describing the flow near the bottom due to surface waves from which the hydrodynamic forces on the grains can be derived. Only the case of waves of small amplitude and great length in relatively deep water has been considered in the present study. Under this condition the flow within the main body of water can be described by applying the irrotational flow theory. (1)
Appears in Collections:Technical Memorandum

Files in This Item:
File Description SizeFormat 
BEB-TM-97.pdf4.18 MBAdobe PDFThumbnail