Mooring System Design and Optimization for Floating Bridge of Urmia Lake

Abstract

In order to get better understanding on the response of floating bodies, different design aspects of mooring lines has been investigated in this paper. Mooring lines are categerized into two types; the catenary settling on the sea floor (type 1) and the limited one which has no dead-length on sea floor (type 2). It has been observed that the stiffness of both types may be well predicted by Jain’s formulation and in the design process of floating bodies the mooring lines may be replaced by uncoupled horizontal and vertical springs. On the other hand, the anchor capacity against sliding and release from the mean still water has been studied in this paper. From the results of a parametric study, using the discrete element method, the block anchor the dimensions for the Urmia floating bridge has been optimized and the behavior of anchor and seabed deposits for release of block anchor indicates that the burial depth and the stress level on the block anchor itself and the sea bed are in the allowable and elastic region, respectively.

Stiffness of mooring lines and performance of floating breakwater in three dimensions

“…It should be also noted that Sannasiraj et al [20] conducted two-dimensional experiments in order to validate their theoretical model. The simplified approach of Jain [12] for the calculation of the mooring lines' stiffness coefficients has been also used by Daghigh et al [4], who investigated the effect of different design aspects of the mooring lines on the dynamic behavior of floating bridges and performed a parametric study in order to select the optimum mooring lines' condition in terms of the horizontal forces on the mooring lines and the forces on the anchor.…”

Dynamic behaviour of short-term floating bridges

“…In such a case, the effect of the hydrodynamic interaction between the bridge pontoons is expected to be very week on the dynamic response of the bridge in terms of the heave and roll motions of the bridge. In Urmia Lake, another study was done by Daghigh et al (2002) who studied the mooring system design and optimization for floating bridges. Mooring lines were categorized into two types; the catenary type settling on the sea floor and the limited type which has no dead-length on the sea floor.…”