that parallel the kinds of experiments carried on in wave tanks. In both 
cases it is possible to work with many more variables than has formerly 
been the rule. As long as computational facilities are limited to thase 
of a desk calculator, the treatment of multivariate problems is very 
tedious, and indeed is largely impractical. The advent of the high-speed 
computer has changed this picture markedly. 
During this decade both the geologist and the engineer can gain 
greater insight into beach processes and responses than has been possible 
heretofore. The more closely that experimentation and field work are 
coordinated, the greater will be the opportunity for discerning those 
aspects of beach process and response that are of basic importance in the 
design of protective shore structures. 
The concept of a beach model, in the degree that it provides a 
framework for this closer understanding, can become the point of entry 
for development of an enlarged and in some respects a more fundamental 
approach to the problem of protecting shorelines from severe erosion. 
SELECTED REFERENCES 
Three of the following papers are pertinent to geological models, 
and they are offered as an introduction to the growing literature on the 
subject. 
Griffiths, J. C., 1962. Uses of computers and statistics in exploration 
and development of mineral resources: Univ. Arizona, College of 
Mines Symposium, Vol. 1, pp. El 1-19. 
Hall, J. V., Jr., 1963. Coastal Engineering Structures: paper presented 
before ASCE Water Resources Engineering Conference, Milwaukee, Wisc. , 
15 May 1963. 
Krumbein, W. C., 1961. The analysis of observational data from natural 
beaches: Beach Erosion Board, U. S. Army Corps of Engineers, Tech- 
nical Memorandum No. 130. 
Miller, R. L., and Zeigler, J. M., 1958. A model relating dynamics and 
sediment pattern in equilibrium in the region of shoaling waves, 
breaker zone, and foreshore: Journal of Geology, Vol. 66, 
pp. 417-441. 
