Physical Model Study of a Barge Mooring System,
Abstract
The EMPRESS II is planned to be a 105' x 120' barge that will be used to test ships. Moorings for the EMPRESS II barge and test vessel are being designed for the Chesapeake Bay. One of these moorings is to be a site where the barge can tie up during moderate to small storms. The purpose of this report is to describe 1/28 scale physical model tests conducted for the storm mooring to determine dynamic loads in the mooring due to waves. Both wave spectra and monochromatic waves were tested. Test results show that peak dynamic loads are produced when the driving waves force the barge/mooring system into the first mode of oscillation. In this mode of oscillation the barge behaves as a mass and the mooring behaves as a spring. Wave groups seem to drive this long period oscillation, which has periods ranging from one to several minutes. Exhibits in this report include the peak mooring load data and a design curve developed by forming an upper envelop over the test results. Hindcast wind speeds required to develop various wave heights are shown on the upper portion of the figure. Keywords: Barges; Mooring systems; and Two dimensional model.
Document Details
- Document Type
- Technical Report
- Publication Date
- Apr 01, 1984
- Accession Number
- ADA168785
Entities
People
- William G. Grosskopf
- William N. Seelig
Organizations
- Naval Facilities Engineering Systems Command