PREFACE 
This report is published to provide coastal engineers with an analysis 
of data on suspensions of sediment produced by oscillatory motion in a 
specialized laboratory facility at the Hydraulic Engineering Laboratory 
(HEL), University of California, Berkeley. The work was carried out 
under the coastal processes program of the U.S. Army Coastal Engineering 
Research Center (CERC). 
The report was prepared by Dr. Thomas C. MacDonald, a former graduate 
student at the Hydraulic Engineering Laboratory, and now an engineer with 
Leeds, Hill, and Jewett, San Francisco, under CERC Contract No. DACW72- 
71-C-0024. The report is a modification of report No. HEL 2-39 which was 
originally issued by the Hydraulic Engineering Laboratory. 
The author acknowledges with sincere gratitude the active supervision 
and counsel of the late Professor H.A. Einstein, the advice and the 
opportunity to participate in this project provided by Professor J.W. 
Johnson, and the assistance of Professors J. Harder and L. Talbot during 
the experiments and in the preparation of the report. The cooperation 
and assistance of the staff of the Hydraulic Engineering Laboratory are 
gratefully acknowledged, especially W.A. Hewett, J.C. Allison, and R.W. 
Cambell. 
Dr. M.M. Das, former Hydraulic Engineer in the Coastal Processes 
Branch, and Dr. C.J. Galvin, Jr., Chief, Coastal Processes Branch, were 
the CERC contract monitors, under the general supervision of R.P. Savage, 
Chief, Research Division. 
Comments on this publication are invited. 
Approved for publication in accordance with Public Law 166, 79th 
Congress, approved 31 July 1945, as supplemented by Public Law 172, 
88th Congress, approved 7 November 1963. 
JOHN H. COUSINS 
Colonel, Corps of Engineers 
Commander and Director 
