PREFACE 
Ten experiments were conducted at the Coastal Engineering Research 
Center (CERC) from 1970 to 1972 as part of an investigation of the Lab- 
oratory Effects in Beach Studies (LEBS), to relate wave height varia- 
bility to wave reflection from a movable-bed profile in a wave tank. 
The investigation also identified the effects of other laboratory con- 
straints. 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 pro- 
cesses program. 
This report (Vol. V), the fifth in a series of eight volumes on the 
LEBS experiments, analyzes a movable-bed experiment which shows that 
wave height variability depends on a complex relationship between pro- 
file changes and wave reflection. The experiment, when compared to 
earlier tests, suggests that the tank width is an important parameter 
affecting profile development. 
Volume I of this series documents the procedures used in the 10 
movable-bed laboratory experiments, and also serves as a guide for con- 
ducting realistic coastal engineering laboratory studies. Volumes II to 
VII are data reports for the other experiments; Volume VIII is a final 
analysis report. 
This report was prepared by Charles B. Chesnutt, principal investi- 
gator, and Robert P. Stafford, senior technician in charge of the experi- 
ment. Dr. C.J. Galvin, Jr., Chief, Coastal Processes Branch, provided 
general supervision. 
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. 
ff Zl © 
OHN H. COUSINS 
Colonel, Corps of Engineers 
Commander and Director 
