Comparison of the seastate during Thane and Nilam cyclones along South East coast of India - using WAM

Knowledge on the ensemble wave characteristics such as significant wave height (Hs) during the\ud propagation of a cyclone is important in the planning of mitigation measures along the coastal zone. This is in addition\ud to the design of structures in the nearshore and along the coast for its sustainability. Hence, the wave climate which\ud persist along the south-east coast of India during two different cyclones Thane and Nilam that made landfall in the\ud successive years 2011 and 2012 are simulated using WAM. The model simulation has been validated with field\ud observations. The detailed results are discussed in this paper

Experimental investigations on wave transmission at submerged breakwater with smooth and stepped slopes

Submerged breakwaters are gaining more popularity as a potential coastal protection structure resulting in moderate wave transmission with significant wave energy dissipation. Submerged breakwaters are mainly adopted to prevent erosion and to dissipate the incident wave energy. In addition, the premature wave breaking facilitates the wave surfing activities by proper designing of submerged breakwater. In the present study, the experiments are conducted on submerged breakwaters in a two dimensional wave flume to investigate the influence of stepped and smooth front slope of the submerged breakwater, its height and width in reducing wave energy. A total number of eighteen sets of experiments has been conducted for three different breakwater heights (31cm, 28cm and 26cm) and three different breakwater widths (10cm, 20cm and 30cm) with stepped and smooth front slope of breakwater. The submerged breakwater models are subjected to regular waves of four different wave heights and five different wave periods in a constant water depth of 31cm, to determine wave transmissions characteristics. The influence of relative breakwater width, relative depth of submergence of the breakwater and roughness of breakwater front slope on wave transmission are analyzed and discussed in this paper.DAA

SPH simulation of sloshing due to horizontal tank excitation

Smoothed particle hydrodynamics (SPH), a true mesh less method has been used to simulated the sloshing problem. The tank motion is restricted to regular horizontal excitation. A number of issues have been addressed while making attempts for simulating with higher h/l ratio. The principle approaches undertaken in order to understand the effectiveness of the standard method have been mostly laid upon different boundary modeling techniques and the artificial viscosity models. Selected method for the time integration scheme has been found to play a significant role. The classical dam break problem has been revisited based on those findings. Model predictions for this case have been compared with few other different CFD techniques as well as experimental data as available in literature. Simulation of tank sloshing has been compared with FEM simulation where the entire mode of investigation is different. The fine tuned values of different controlling parameters have been reported

Response of Slender Vertical Cylinder under Breaking Waves

AbstractCoastal and offshore structures consist of slender cylindrical member as the fundamental component.Breaking wave loads are significantly important now a days due to calamities and disasters occurring in ocean environment. Structural damages and failures are catastrophic due to wave impact and it is necessary to understand the influence of breaking wave impact on the structural members. The standard codal provisions of breaking wave impact on structural members is scarce, it is essential to understand the physics of the interaction of breaking waves on structural members. In the present study, an experimental investigation has been carried out to measure the response of the slender vertical cylinder under breaking waves due to constant amplitude spectrum. The structural response of the vertical cylinder under constant amplitude spectrum was found from the measured acceleration. The deflection of the vertical cylinder due to breaking wave impact from acceleration measurements were found out by using omega arithmetic method. The acceleration and deflection are found to be maximum for both severe and moderate plunging events. The maximum deflection observed for severe plunging event is nearly 0.1m for the present study

Laboratory study of breaking wave induced noises

Proceedings of the International Symposium on Ocean Wave Measurement and Analysis21002-101

SPH simulation of sloshing due to horizontal tank excitation

Smoothed particle hydrodynamics (SPH), a true mesh less method has been used to simulated the sloshing problem. The tank motion is restricted to regular horizontal excitation. A number of issues have been addressed while making attempts for simulating with higher h/l ratio. The principle approaches undertaken in order to understand the effectiveness of the standard method have been mostly laid upon different boundary modeling techniques and the artificial viscosity models. Selected method for the time integration scheme has been found to play a significant role. The classical dam break problem has been revisited based on those findings. Model predictions for this case have been compared with few other different CFD techniques as well as experimental data as available in literature. Simulation of tank sloshing has been compared with FEM simulation where the entire mode of investigation is different. The fine tuned values of different controlling parameters have been reported

Diffraction-radiation of multiple floating structures in directional waves

10.1016/S0029-8018(99)00066-9Ocean Engineering282201-234OCEN

Error correction of a predictive ocean wave model using local model approximation

10.1016/j.jmarsys.2004.05.028Journal of Marine Systems531-41-17JMAS

Local model approximation in the real time wave forecasting

10.1016/j.coastaleng.2004.12.004Coastal Engineering523221-236COEN

Wave data assimilation using ensemble error covariances for operational wave forecast

10.1016/j.ocemod.2006.04.001Ocean Modelling141-2102-12