FORCES ON VERTICAL WALL CAUSED BY INCIDENT BORES

The forces on a vertical wall due to the impact of a bore generated by a broken solitary wave were measured in the laboratory. The bores varied in height from 3.1 - 4.9 cm and in celerity from 75 - 126 cm/s. High-speed motion pictures of the bore impact process were taken simultaneously with force measurements. The water particle velocities on the surface of the bore were obtained from the motion pictures using small floats. The maximum rise of the water surface on the wall exceeded twice the velocity head, based on the bore celerity for all conditions. The maximum measured force occurred after the maximum run-up for all conditions of this study. The vertical accelerations in the run-up jet at the wall explain some of the characteristics of the force record that have not been well understood. The maximum measured forces varied from five to nearly seven times the hydrostatic force, based on the height of the incident bore and the local still-water depth. For the four largest bores, the theory of Cross (1967) was in reasonable agreement with the maximum measured force.

• Supplemental Notes:
  • J Waterway, Port Coastal, v 116 n 5, Sept/Oct 1990, p 592 [22 p, 18 ref 2 tab, 15 fig]
• Authors:
  • Ramsden, Jerald D
  • Raichlen, F
• Publication Date: 1990

Language

• English

Subject/Index Terms

• TRT Terms: Force; Tsunamis; Walls; Waves
• Old TRIS Terms: Wave forces on structures
• Subject Areas: Bridges and other structures; Hydraulics and Hydrology; Marine Transportation;

Filing Info

• Accession Number: 00698966
• Record Type: Publication
• Source Agency: British Maritime Technology
• Files: TRIS
• Created Date: Aug 14 1995 12:00AM