In a shallow shelf region, turbulent motion can have a major effect on coastal processes including ecosystem functioning, surface gas exchange and sediment resuspension. Many factors contribute to such turbulence; wind and wave forcing, buoyancy induced by surface heat fluxes an…
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A ferry transportation system consists of many factors, which interact in a complex manner. Such system is very difficult to analyze analytically. A computer simulation is thus an appropriate method to aid in understanding the system and its design. The Province of Maluku, which…
The objective of this research is to develop linear and nonlinear theories of wave propagation in extended elastic cables with and without fluid interaction. The motivation for doing so is the need to understand the dynamic response of long cable suspensions, the high frequency/…
This study investigates and determines certain aspects of section 5 of Decree No. 10 of 1987 on the National Shipping Policy. It deals with the relative cost of construction of comparable vessels in Nigeria and in foreign countries (i.e. USA, U.K. Japan, and S. Korea). The Niger…
This research evaluated the applicability of electrochemical impedance spectroscopy (EIS) as a non-destructive technique to predict and characterize the degradation of carbon fiber reinforced polymer (CFRP) composites exposed to aqueous environments at ambient and 6.2 ± 0.3 MPa.…
The purpose of this dissertation is to create a computer simulation model of a bucket wheel dredge for mining sand and tin-ore. This research is part of a long term plan of PT Timah Tbk, an Indonesian tin mining company, to search for alternative dredging technologies for offsho…
This thesis studies the impact, on a painted surface, of the presence of some natural oils (olive, mustard, and fish oil) and proteinaceous substances derived from ground insects and eggs. The performance of both water-based and oil-based coatings has been tested in a series of …
Two mechanical systems are investigated during the course of the present study. In the first system a simplified offshore structure subjected to wave loading is delineated, through which a unified second-order stochastic averaging approach suitable for practical nonlinear ocean …
Movable bed, scale model experiments were conducted at three length scales, 1/8.5, 1/10 and 1/11, in a 90 ft-long wave tank to study scale effect and equilibrium profile characteristics under sinusoidal, accreting wave action. Geometric similarity, deep water wave steepness, wav…
A hyperboloidal low order source-doublet steady/unsteady time domain panel method code PROPELLA was modified and used to evaluate effects of hub taper angle and pod-strut geometry on the open water propulsive performance of a fixed pitch screw propeller used in podded propulsion…
Corpus Christi Bay (TX, USA) is a shallow wind-driven bay which is designated as a National Estuary due to its impact on the economy. But this bay experiences periodic hypoxia (dissolved oxygen <2 mg/l) which threatens aerobic aquatic organisms. Development of the Coastal Margin…
The current research investigates the performance of podded propulsors with varied geometry at different azimuthing conditions for pusher and puller configurations in open water. In order to determine the prominent geometric parameters and to establish their effects on the hydro…
The focus of the research is the evaluation of dynamic and static pressures acting on floating bodies. Specifically, these pressures result from large motions of a multi-hull ship in 6 dof. The components of the dynamic pressure are radiation, diffraction, and the Froude-Kriloff…
The Seaformatics project is a five year AIF project that intends to develop to a proof-of-concept seafloor array of wireless marine sensors for use in monitoring seabed processes, including applications such as geological imaging and earthquake detection. Individual low cost sen…
The Agulhas Undercurrent Experiment took place in February-March 2003 off the east coast of South Africa and included 112 CTD and LADCP casts along four cross-slope sections and three offshore sections. Direct absolute velocities in the Agulhas Current show a narrow and swift cu…
Durability of the composite materials in marine environments has been investigated experimentally and with analytical and numerical methods. The main focus of this study is on the integrity of the fiber/matrix interface under seawater exposure. A single-fiber compression test sp…
Torpedo-shaped anchors serve as foundations for risers and floating structures in the deep-water marine environment. Such cone-tipped, cylindrical steel pipes, ballasted with concrete and scrap metal, penetrate the seabed by the kinetic energy they acquire during free fall. Esti…
The continuing growth of maritime transportation and the great competition in shipping industry have created a fertile field for applying computer simulation. In this research, a simulation model for a seaport is designed, analyzed and tested. This simulation model represents th…
The Istanbul Strait, the narrow waterway separating Europe from Asia, holds a strategic importance in maritime transportation as it links the Black Sea to the Mediterranean. It is considered one of the world's most dangerous waterways to navigate. Over 50,000 transit vessels pas…