. Coastal engineering studies in support of Virginia Beach, Virginia, Beach Erosion Control and Hurricane Protection Project : report 1, physical model tests of irregular wave overtopping and pressure measurements. Sea-walls; Sea-walls. PT151 SUR. 40 PRESSURE, PSI Figure 16. Typical Instantaneous profile of surge pressures Negative Pressures 41. As stated previously, CENAO personnel had expressed an Interest in identifying significant negative pressures experienced during testing. Pri- mary interest was related to whether wave runup or drawdown could induce nega- tive pressures small enough to
. Coastal engineering studies in support of Virginia Beach, Virginia, Beach Erosion Control and Hurricane Protection Project : report 1, physical model tests of irregular wave overtopping and pressure measurements. Sea-walls; Sea-walls. PT151 SUR. 40 PRESSURE, PSI Figure 16. Typical Instantaneous profile of surge pressures Negative Pressures 41. As stated previously, CENAO personnel had expressed an Interest in identifying significant negative pressures experienced during testing. Pri- mary interest was related to whether wave runup or drawdown could induce nega- tive pressures small enough to warrant inclusion in the procedure for calcu- lating design uplift forces. 42. A cursory analysis of the data indicated that significant negative pressures may have been recorded. Ten records included measured pressures with values less than -20 psi. However, closer inspection of these records indicated that the small negative pressure durations were less than 1 msec. Also, in most cases the minimum negative pressures occurred within milli- seconds of a maximum shock pressure. Such events are shown in Figures 17 and 18. Due to extremely small durations characteristic of these events, these records were not evaluated in further detail; therefore, at this time an explanation of these occurrences is incomplete. In all cases, these events 34. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Heimbaugh, Martha S; U. S. Army Engineer Waterways Experiment Station; Coastal Engineering Research Center (U. S. ); United States. Army. Corps of Engineers. Vicksburg, Miss. : U. S. Army Engineer Waterways Experiment Station ; Springfield, Va. : available from National Technical Information Service
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