CONTENTS-Continued 



FIGURES 



Page 



1 Depoe Bay, Oregon 12 



2 Hastings Small-Boat Harbor, Minnesota 15 



3 Merrill's Marina, Sunset Beach, California 16 



4 Hyannis Inner Harbor, Massachusetts 17 



5 Port San Luis, California. A typical harbor in a roadstead 18 



6 Shilshole Bay Marina, Seattle, Washington 20 



7 Trailing slips in a river 21 



8 Covered slips in BeUingham Harbor, Washington 22 



9 Floating docks being pinched upward by forming ice in Lake Michigan 24 



10 Ice- and frost-damaged parking lot, Boston Harbor Marina, Massachusetts ... 26 



1 1 Sample refraction-diffraction diagram 27 



12 Model study for proposed harbor at Port San Luis, California 29 



13 Entrance shoaling by littoral drift in a Massachusetts harbor 33 



14 Nearshore section of rubble-mound jetty 35 



15 Maintenance of entrance to off -river basin with land-based equipment 37 



16 Mechanical current generator 40 



17 Adjacent park complements harbor development 46 



18 Quadripod armor units being placed on breakwater 48 



19 Wave and surge barrier, Monterey Harbor, California 51 



20 Bale Comeau Breakwater, Quebec 52 



21 Use of toe stone to prevent wave scour at the base of vertical walls 53 



22 Dana Point Marina, Cahfornia 55 



23 Two-stage construction of rubble-mound structure 57 



24 Littoral transport and beach erosion due to wave diffraction 58 



25 Entrance to Newport Bay, California 60 



26 Changing cross sections of channel-flank protection 62 



27 Typical dredge cut through harbor entrance 63 



28 Narrow channel construction by land-based equipment 64 



29 Channel bottom erosion and shoaling due to waves and tidal currents 66 



30 Entrance to Oceanside Harbor, California, showing wave breaker design .... 67 



31 Well protected entrance to boat basin, Harwick, Massachusetts 68 



32 Rubble -slope revetment being placed directly on filter cloth 70 



33 Slope revetment of prefabricated overlapping block, Florida 71 



34 Grout -fiUed cloth mattress bank protection with weep holes 72 



35 Shallow boat basin marginal to a river 73 



36 Conversion of river bifurcation into a smaU-craft harbor 74 



37 Three-log floating boom for short -period wave attenuation 76 



