Pipeline upheaval buckling in clayey backfill using numerical analysis

A. Koochekali; B. Gatmiri; A. A. Koochekali

Volume 3, Issue 2 , June 2013, Pages 43-50

  Offshore pipelines used for oil and gas transportation are often buried to avoid damage from fishing activities and to provide thermal insulation. Thermal expansion and contraction of the pipeline during operation can lead to lateral or upheaval buckling. A safe buried pipeline design must take into ...  Read More

Experimental investigation of wave parameters effect on damage of the berm reshaped seawall under irregular wave attack

A. R. Bakhtiari; M. Fathi Moghadam

Volume 3, Issue 2 , June 2013, Pages 51-56

  This paper presents an experimental study the influence of wave parameter on the damage of reshaping seawall, model tests have been performed in several water level conditions. The experiments of physical modeling of this research have been done in the flume of the Soil Conservation and Watershed Management ...  Read More

Numerical investigation of effective harbor geometry parameters on sedimentation inside square harbors

M. Mojabi; K. Hejazi; M. Karimi

Volume 3, Issue 2 , June 2013, Pages 57-68

  Sedimentation is one of the most important problems in harbors that results in considerable economic costs. Harbor planforms affects the flow pattern in the harbor basin and consequently, plays an important role in sediment transport and sedimentation. In the present study, a two dimensional depth-averaged ...  Read More

Influence of cement content on concrete performance in corrosive environments (sea water)

M. Soleimanirad; M. Tadayon; F. Rezaie

Volume 3, Issue 2 , June 2013, Pages 69-76

  In this study, the effect of cement content on concrete performance in corrosive environments is investigated on concrete mixtures having the same water/cement (w/c) ratio. Three w/c ratios (0.40, 0.45 and 0.50) were used and for each w/c ratio three mixtures were prepared with cement contents 350, 400 ...  Read More

The effect of semi-active controller in Sirri jacket seismic vibration control

T. Taghikhany

Volume 3, Issue 2 , June 2013, Pages 77-84

  The Sirri jacket offshore platform was designed and installed in Persian gulf of Iran in 1975 and has been in service since that time. The importance of offshore structure's stability and the failure of this kind of structure during an earthquake in different active zones revealed that earthquake loading ...  Read More

A Novel Indicator to Predict the Onset of Instability of a Gravitational Flow on a Slope

H. Chitsaz Boroujerdi; A. A.Bidokhti; Sh. Sharafatmandjoor

Volume 3, Issue 2 , June 2013, Pages 85-90

  In order to present a quantitative indicator for the onset of instability, in this paper, the critical points of a stratified gravitational flow on a slope are found and analyzed. These points are obtained by means of the solution of the two-dimensional Navier-Stokes equations via the standard Arakawa-C ...  Read More

Hydrodynamic damped pitch motion of tension leg platforms

M. R. Tabeshpour; B. Ataie Ashtiani; M. S. Seif; A. A. Golafshani

Volume 3, Issue 2 , June 2013, Pages 91-98

  Because of fluctuation in leg tension, pitch motion is very effective fatigue and life safety of leg elements in tension leg structures (TLSs). In this paper an exact solution for pitch vibration of a TLS interacting with ocean wave is presented. The legs of TLP are considered as elastic springs. The ...  Read More

Effect of remediation strategy on crude oil biodegradation kinetics and half life times in shoreline sediment samples

L. Mohajeri; H. A. Aziz; M. H. Isa; M. A. Zahed; S. Mohajeri

Volume 3, Issue 2 , June 2013, Pages 99-104

  Bioremediation, the process by which microorganisms degrade organic compounds to non-toxic or less toxic substances, has been widely used for cleanup of coastal ecosystems after oil spills. In this study, the hydrocarbon degradation rate and half lives in three bioremediation strategies (natural attenuation, ...  Read More