Accession Number:

ADA499734

Title:

Assessment of Proposed Wave Barriers for 5T Small Boat Basin at Naval Station Norfolk Virginia

Descriptive Note:

Technical rept.

Corporate Author:

NAVAL FACILITIES ENGINEERING SERVICE CENTER PORT HUENEME CA

Personal Author(s):

Report Date:

2008-07-01

Pagination or Media Count:

47.0

Abstract:

This task assesses the dynamic responses of a small boat basin to local storms and quantifies the performance of a proposed breakwater. The assessment procedure adopts a sophisticated Computational Fluid Dynamic model capable of preserving the exact site condition and all prevailing hydrodynamic mechanisms at high accuracy. This exercise clearly illustrates the feasibility and merits of modern simulation models for designs. The results confirm that this basin is sensitive to local storms. It is particularly susceptible to oblique seas. The present breakwater setup with the north arm alone is insufficient to shelter the basin. The proposed south arm is essential. Two breakwaters combined work reasonably well in perpendicular waves, however, lose its effectiveness in oblique seas. Two simple measures of high potential to further mitigate wave disturbances inside the basin deserve considering. One is to slightly extend the south breakwater and bend its north end by 45 degrees to the east. This would reduce the amount of wave penetration through the basin entrance in oblique seas. In fact, the south breakwater need not be straight or parallel to the north breakwater. A zigzag shape may be more favorable from the perception of basin stability. The other is to install a wave absorbing mechanism along the south bulkhead and the weather side of the north breakwater and perhaps the leeward side of the south breakwater as well. This would reduce wave intrusions via successive reflections off the breakwaters and the south bulkhead.

Subject Categories:

  • Civil Engineering

Distribution Statement:

APPROVED FOR PUBLIC RELEASE