APPENDIX C 



PEAK WATER DATA FOR SINGLE PILES IN SINGLE WAVE TRAIN 



This appendix includes 73 rectilinear plots obtained from a simple 

 computer program. The plots show 148 data sets of measured peak water 

 versus pile orientation with respect to wave direction, with peak water 

 normalized by the incident crest height. The original test records 

 yielded incident crest height and peak water level (at each pile orienta- 

 tion angle), both measured above the SWL. 



The plots include all data sets surviving a check of internal con- 

 sistency of the test record. This check ensured that the strip-chart 

 record of the incident wave did not display ".excessive" change in SWL or 

 wave height during the test. Typically, the sensitivity of the electrical 

 gage was such that incident wave height was recorded at about 35 to 40 

 lines of the 50 lines on the strip chart. For convenience, an excessive 

 change in height or SWL was defined as two or more lines; changes greater 

 than this complicate the reduction of the test record and the production 

 of accurate normalized plots. This check resulted in the deletion of a 

 large number of data sets obtained in the 85-foot tank. 



Some of the remaining data displayed nonclosure of the peak water 

 pattern. Measurements at the same 6 at the beginning and end of a 

 test were sometimes appreciably different. Tests were begun at 6 = 0° or 

 at B = 90°, and successive measurements were made at increasing B. Non- 

 closure was indicated as a jump in measurements near this starting angle, 

 and was apparently due to residual wetting of the wafer electrical gage 

 regularly used at the pile. 



Some data sets for circular piles showed all normalized peak water 

 measurements below 1.0. This occurred only for wetted paper or powder 

 erosion records with small incident wave height, and was probably caused 

 by a slight error in marking the SWL when the record was made. 



On the following plots, individual tests are identified by a six- 

 digit alphanumeric code. The first letter is G, W, or E, indicating 

 electrical gage, wetted paper, or powder erosion record of peak water, 

 respectively; tests with a leading E are one-wave records. The second 

 letter is A if the test was done in the 96-foot tank, and B if the 

 test was done in the 85-foot tank. The third character is the last 

 number of the year, between 1970 and 1973, when the test was performed. 

 The final three numbers indicate separate tests done in a certain year. 



Each following plot shows only data for a certain pile with certain 

 wave period and water depth. 



93 



