Model Studies of Apra Harbor Guam, M.I. Progress Report for March, 1948

The data presented in the February report were analyzed further during the month of March. This analysis, guided by BuDock's letter of 4 December 1947, BuDock's dispatch of March 1948, and a conference with the OinCC of the contract, resulted in comparisons of shoal effects on the basis or averaging the disturbances in the repair basin areas designated for primary use. This average facilitates the comparison of the effectiveness of the different protective structures, since each average characterizes the performance or each given structural configuration under a given imposed ocean condition. Experimentation was started on photography to record induced current movements within the harbor. Attempts are being made to adapt the equipment available to the taking of pictures in the daytime rather than during the late evening and early morning hours found necessary for the Pasadena model. The wave height measuring unit which gave a great deal of trouble in the latter part of February was thoroughly reconditioned during the analysis period to reduce delays which might otherwise arise during the running of future tests.