Experimental Study on Hydrodynamic Characteristics of Barge-Type Breakwaters under Different Mooring Methods

Abstract

In this paper, a yacht project in Tingjiang Town, Mawei, Fujian, is suggested as an example of a barge type breakwater made out of scrap barges. The physical modelling of a two-dimensional flume wave test was carried out on a barge-type breakwater, focusing on the wave dissipation and anchor chain forces under two different mooring methods, the “crossed tilt” mooring and the “front and rear direct pull” mooring, with no change in the size of the breakwater. The test results show that the effect of wave elimination of the barge-type breakwater gradually decreases with the increase of wave elements under different mooring conditions, but the effect of wave elimination of the barge-type breakwater is significantly better under the “crossed tilt” mooring systems than under the “front and rear direct pull” mooring systems; the maximum tension of the anchor chain under the “inner eight” diagonal mooring method is significantly higher than that under the front and rear straight pulling mooring method. The maximum anchor chain tension under the “crossed tilt” mooring system is significantly greater than that under the fore and aft straight mooring method, while the average anchor chain tension does not change significantly under the two mooring methods.

Dynamic Inversion Model of the Mooring Force on a Floating Bollard of a Sea Lock

“…Problems with mooring safety in sea locks connecting inland canals and the open sea [1,2] are usually related to structural overload and damage to bollards directly caused by the mooring force or deterioration of the material properties of metal indirectly caused by corrosion related to environmental factors such as seawater intrusion [3][4][5][6][7][8]. Mooring systems are of vital importance for offshore floating facilities [9][10][11][12], and bollards are a key part of mooring systems at the sea lock, which are anchor points for mooring lines used to secure a vessel or ship [13]. They can generally be classified as fixed bollards and floating bollards (FBs) [14].…”