Accession Number:

ADA210917

Title:

Dynamic Water Wave Pressures on a Recurved Model Seawall

Descriptive Note:

Master's thesis

Corporate Author:

TEXAS A AND M UNIV COLLEGE STATION

Personal Author(s):

Report Date:

1989-08-01

Pagination or Media Count:

95.0

Abstract:

The dynamic pressures acting on a 15 scale recurved model seawall caused by breaking water waves were investigated. The magnitude, location and distribution of the shock and secondary pressures were determined from physical experiments and found to be dependent on breaking wave height, incident wave height, and water depth. During the experiment, the water depth and the incident wave characteristics of wave period and wave height were varied. As the breaking wave height and incident wave height increased, the magnitude of the shock and secondary pressure increased. Shock pressures as great as 3.72 kNsq m were recorded, while a change in water depth of 0.01m caused a mean pressure increase of approximately 0.009 kNsq m. The wave form which caused the greater shock pressures was examined and found to have a relatively large breaking height and steepness, but does not entrap a large quantity of air. The secondary pressures on the upper three transducers consistently showed a negative pressure, the largest value being -1.2 kNsq m. It was determined that a suction formed as the wave surged past these transducers producing negative pressures. Experimental results were compared with several vertical wall shock pressure formulas which are used to predict the shock pressure on a recurved wall. Minikins formula came closest in agreement to the measured shock pressures. Other formulas predicted values on the order of 4-100 times greater than the measured values. Theses.

Subject Categories:

  • Physical and Dynamic Oceanography
  • Civil Engineering

Distribution Statement:

APPROVED FOR PUBLIC RELEASE