CONTENTS — Continued 

 FIGURES 



Page 



1 Location of the study area 8 



2 Comparison of annual mean water levels at ocean and Great Lakes 



sites 8 



3 Profile stations in vicinity of Pentwater jetties 11 



4 Station locations throughout the study area 12 



5 Hydrograph showing change in lake levels between survey periods on 



Lake Michigan 13 



6 Longshore continuity of bars in the Great Lakes 15 



7 Beach and nearshore bathymetry in the vicinity of the Pentwater 



Channel which transects the beach and barred areas 16 



8 Short-term changes in bathymetry versus long-term bar migration 17 



9 Net results of long-term migration 18 



10 Envelope of bottom change, station 4 (1967-75) 20 



11 Depths of closure 21 



12 Schematic diagram of volume change calculations 23 



13 Schematized view of profile adjustment as two rigid translations 25 



14 Fathogram with field notations 31 



15 Direction of net longshore transport along the eastern shore 33 



16 Pumped storage facility south of Ludington 34 



17 Silver Lake dunes, looking from Lake Michigan across the dunes to 



Silver Lake 35 



18 Shoreline scarps along Silver Lake dunes, looking northward over 



station 16, May 1973 36 



19 Longshore variation in net shore retreat from 1969 to 1976 37 



20 Calculated versus measured retreat 38 



21 Importance of offshore slope » 41 



22 Diagram for determining if a suspected error weakens or strengthens 



arguments based on the sediment balance prediction 42 



23 Limitations of analytical models with profiles everywhere concave up.. 43 



24 Adjacent profiles from various subregions within the study area 45 



25 A composite of all profiles as surveyed in 1975 51 



