PREFACE 



Ten experiments were conducted at the Coastal Engineering Research Center (CERC) 

 from 1970 to 1972 as part of an investigation of the Laboratory Effects in Beach 

 Studies (LEBS) , to relate wave height variability to wave reflection from a movable- 

 bed profile in a wave tank. The investigation also identified the effects of other 

 laboratory constraints. The LEBS project is directed toward the solution of problems 

 facing the laboratory researcher or engineer in charge of a model study; ultimately, 

 the results will be of use to field engineers in the analysis of model studies. The 

 work was carried out under the CERC coastal processes research program. 



This report (Vol. VIII) is the last in a series of eight volumes on the LEBS ex- 

 periments. Volume I describes the procedures used in the 10 LEBS experiments, and 

 serves as a guide for conducting coastal engineering laboratory studies; Volumes II 

 to VII are data reports covering all experiments. 



This volume is a comprehensive analysis of results from all 10 experiments, and 

 includes a further analysis of each experiment and how it relates to the other 9 ex- 

 periments on wave height variability, profile equilibrium, and laboratory effects. 



This report was prepared by Charles B. Chesnutt, principal investigator, under 

 the general supervision of Dr. C.J. Galvin, Jr., Chief, Coastal Processes Branch. 



The author gratefully acknowledges the assistance of the following CERC employees 

 who were involved in the LEBS data collection or reduction: J.C. Ahlquist, R.J. Brown, 

 W.J. Brown, S.M. Bruce, J.W. Buchanan, E.G. Burroghs , D.A. Clark, D.M. Clark, G. Davis, 

 W.O. Doll, J.M. D'Ottavio, J.M. Fairchild, E. Fishman, A.B. Frankle, D.C. French, M. 

 Fuhr, H. Goldstein, B.H. Gwinnup, W.J. Herr, F. Holcombe, R.R. Kohler, F. Lago, M.W. 

 Leffler, F.S. Moore, J.J. Moore, D.A. Mowrey, M.J. Murphy, P.C. Pritchett, B.D. 

 Schiappa, K.E. Schreiter, Jr., R.M. .Small, L.C. Tate, C.F. Thomas, W.A. Thompson, T.M. 

 Thrall, and C.V. Willard. Computer programs used in the data reduction were written 

 by J.C. Ahlquist, S.M. Bruce, J.W. Buchanan, and B.A. Sims; programs written by J.C. 

 Ahlquist used techniques developed by W.R. James and O.S. Madsen. Significant contri- 

 butions were made by C.H. Everts, R.J. Hallermeier, C. Mason, and E.F. Thompson through 

 numerous discussions with the author and by reviewing one or more of the early manu- 

 scripts. 



The author extends special appreciation to the following: M.W. Leffler for his 

 assistance in the preparation of the eight manuscripts; C.J. Galvin, Jr., for his 

 guidance and assistance; and R.P. Stafford, for the high quality of the data collected 

 and who coauthored the first seven volumes. 



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. 



Ata* 





JOHN H. COUSINS 



Colonel, Corps of Engineers 



Commander and Director 



