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Previous studies of the scour of cohesive materials as presented in engineering literature and as obtained directly by personal contact are briefly reviewed. Exploratory tests for measuring scour resistance are described, and some correlated results are presented for a test involving scour by a vertical submerged jet impinging on the horizontal surface of a soil sample. The characteristics of the scour surface were observed for a remolded and a natural sediment, and the rates of scour were measured by the weight loss of the sample. The results are presented in terms of dimensional parameters. A new apparatus is described which is designed to permit a direct measurement of a uniform shear stress developed at the surface of a cylindrical sample of a cohesive sediment. Comments are made regarding the direction of future research in this area.
Moore et al. (Sun,) studied this question.