have refined the accuracy of the model roughness, the anticipated 

 refinement of the resultant data did not appear to be justified. 

 In addition, major changes to model pumping control apparatus 

 would have been required to simulate hurricane surges. 



(b) A second potential refinement of accuracy was related 

 to the overtopped jetties. The tests to develop a distorted- 

 scale version of the jetties were all conducted with flow 

 normal to the jetties. During the model tests, flow approached 

 the jetties at varying angles. Again, additional tests could 

 have investigated these conditions more extensively; however, 

 the resultant improvement in accuracy did not appear to justify 

 the tests. 



(c) Both potential sources of error m test results could 

 have been minimized further by testing in an undistorted-scale 

 physical model of the Galveston Harbor Entrance at a consider- 

 ably greater cost. Undistorted-scale model tests will certainly 

 be beneficial as the program for protection of the Galveston Bay 

 complex reaches the detailed design stage; however, the expense 

 of undistorted-scale testing was not considered feasible at this 

 stage of the study. 



(d) The final significant limitation to the results is the 

 basic bed-form changes (in shape and orientation) that would 

 occur during a hurricane surge condition in the prototype. The 

 tests were conducted in a model molded in concrete; therefore, 

 no simulation of these effects was attempted. The basic changes 

 in shape of the entrance during periods of high flow would not 

 be considered significant enough to materially change the re- 

 sults. A more significant change might occur from the changes 

 in bed form during the course of the varying flows expected 

 during a hurricane surge. For this investigation, the subject 

 was not examined in detail; however, care must be taken to 

 assure that some consideration of this matter is included in 



a detailed hydraulic evaluation. 



c. Stabilization of Navigation Channel and Sand Bypassing — F ire 

 Island Inlet, New York . 



(1) Project . Stabilization of the navigation channel and con- 

 struction of a littoral drift trap and a rehandling basin in the inlet, 



a connecting channel for a loaded hopper dredge, and 1,000-foot extension 

 to the Federal jetty. 



(2) References . Bobb and Boland (1969). 



(3) Laboratory . WES. 



(4) Test Period. June 1965 to June 1968. 



496 



