O. H. Pilkey J. V. A. Trumbull K. A. Grove 1982 Hurricanes David (August 29-30, 1979) and Frederick (September 2-5, 1979) caused major flooding of the Rio de La Plata in northern Puerto Rico. A thin mud layer was deposited across the narrow insular shelf adjacent to the river mouth. Within 5 months, fair-weather shelf-winnowing processes moved the mud layer entirely from the shelf, 0.5 to 2 km to the shelf break at the 50-m contour and beyond. The process of mud movement is termed 'mud hopping.' ?? 1982 A. M. Dowden, Inc. application/pdf 10.1007/BF02462803 en Springer-Verlag Mud transportation on a steep shelf, Rio de La Plata shelf, Puerto Rico article