ROUGH ESTIMATION OF MATERIALS QUANTITIES FOR CONSTRUCTION OF HARBORS

In this paper an analytical model is proposed to estimate roughly the materials required for construction of breakwaters of harbors. The proposed model is applicable for the harbors having the square-shape plan basin and the cases that the bathymetry map at the location of the harbor is not available (i.e. a few limited simple measurements or information from water depth or sea bottom slope is available) and the maximum water depth is known from the draft and clearance of the Design Ship. The materials (core, filter layer and armor layer) required for construction of breakwaters are roughly estimated by considering the maximum draft of the Design Ship selected to transport the cargos to the harbor and environmental parameters. By calculating the weights and thicknesses of breakwater section, geometry of breakwaters and also the area of a square basin harbor needed to shelter the ships, the amount of materials required to construct the breakwaters considering a proposed Simplified Estimation Model (SEM) for water depth-length relationship are estimated. To validate the formulation proposed for estimation of material quantities of breakwaters, a case study was applied to seven harbors having quasi-square basin plan, located in Iranian waters in the Persian Gulf. The estimated weights using the proposed SEM and Detailed Estimation Model (DEM) were compared using the bathymetry maps and layouts of these harbors. This comparison shows that considering the acceptable tolerances in the conceptual and basic design phases, the proposed SEM is a good tool to be used in the conceptual and basic design phases of a harbor project.