scispace - formally typeset
Search or ask a question
Author

Vallam Sundar

Other affiliations: Indian Institutes of Technology
Bio: Vallam Sundar is an academic researcher from Indian Institute of Technology Madras. The author has contributed to research in topics: Wind wave & Shore. The author has an hindex of 24, co-authored 195 publications receiving 1778 citations. Previous affiliations of Vallam Sundar include Indian Institutes of Technology.


Papers
More filters
Journal ArticleDOI
TL;DR: In this article, a two-dimensional finite element model is adopted to study the behavior of pontoon-type floating breakwaters in beam waves, and the stiffness coefficients of the slack mooring lines are idealized as the linear stiffness coefficients, which can be derived from the basic catenary equations of the cable.

150 citations

Journal ArticleDOI
TL;DR: In this article, the influence of bottom profile configuration in the oscillating water column (OWC) on its hydrodynamic performance was studied in terms of wave amplification factor, wave power absorption coefficient, hydrodynamics efficiency, lip wall pressure ratio, and air pressure ratio.

77 citations

Journal ArticleDOI
TL;DR: In this paper, Wang et al. investigated the influence of multiple interactions between the cylinders in the group on the hydrodynamic wave forces, wave run-up and free-surface elevation in their vicinity.

66 citations

Journal ArticleDOI
TL;DR: In this paper, the reflection characteristics of vertical and sloping permeable seawalls were determined with a numerical model based on the methodology proposed by Ijima et al. (1976), and the variation of the reflection coefficients with the porosity of the wall, its friction factor and the relative wall width was compared with the analytical results of Madsen (1983).

58 citations

Journal ArticleDOI
TL;DR: In this article, a double bounded probability density function is used to describe the ocean wave statistics and estimate the most probable maximum wave height for offshore structural designs, where the wave height is defined as the probability that the wave reaches a given height.

49 citations


Cited by
More filters
Journal ArticleDOI
TL;DR: In this paper, a new family of generalized distributions for double-bounded random processes with hydrological applications is described, including Kw-normal, Kw-Weibull and Kw-Gamma distributions.
Abstract: Kumaraswamy [Generalized probability density-function for double-bounded random-processes, J. Hydrol. 462 (1980), pp. 79–88] introduced a distribution for double-bounded random processes with hydrological applications. For the first time, based on this distribution, we describe a new family of generalized distributions (denoted with the prefix ‘Kw’) to extend the normal, Weibull, gamma, Gumbel, inverse Gaussian distributions, among several well-known distributions. Some special distributions in the new family such as the Kw-normal, Kw-Weibull, Kw-gamma, Kw-Gumbel and Kw-inverse Gaussian distribution are discussed. We express the ordinary moments of any Kw generalized distribution as linear functions of probability weighted moments (PWMs) of the parent distribution. We also obtain the ordinary moments of order statistics as functions of PWMs of the baseline distribution. We use the method of maximum likelihood to fit the distributions in the new class and illustrate the potentiality of the new model with a...

742 citations

01 Jan 2010
TL;DR: A 23-year database of calibrated and validated satellite altimeter measurements is used to investigate global changes in oceanic wind speed and wave height over this period and finds a general global trend of increasing values of windspeed and, to a lesser degree, wave height.
Abstract: Wind speeds over the world’s oceans have increased over the past two decades, as have wave heights. Studies of climate change typically consider measurements or predictions of temperature over extended periods of time. Climate, however, is much more than temperature. Over the oceans, changes in wind speed and the surface gravity waves generated by such winds play an important role. We used a 23-year database of calibrated and validated satellite altimeter measurements to investigate global changes in oceanic wind speed and wave height over this period. We find a general global trend of increasing values of wind speed and, to a lesser degree, wave height, over this period. The rate of increase is greater for extreme events as compared to the mean condition.

737 citations

Book
01 Jan 1985
TL;DR: Theoretical Description of Random Sea Waves Statistical Theory of Irregular Waves Techniques of Random Wave Analysis 2D Computation of Wave Transformation with Random Breaking and Nearshore Currents Statistical Analysis of Extreme Waves Prediction and Control of Beach Deformation Processes.
Abstract: Evolution of Design Method Against Random Waves Statistical Properties and Spectral of Sea Waves Transformation and Deformation of Random Sea Waves Design of Breakwaters Design of Coastal Dikes and Seawalls Probabilistic Design of Harbor Facilities Harbor Tranquility and Vessel Mooring Hydraulic Model Tests with Random Waves Theoretical Description of Random Sea Waves Statistical Theory of Irregular Waves Techniques of Random Wave Analysis 2D Computation of Wave Transformation with Random Breaking and Nearshore Currents Statistical Analysis of Extreme Waves Prediction and Control of Beach Deformation Processes.

436 citations

Book
21 Aug 2006
TL;DR: The mathematical theory and technology needed to understand the multiple scattering phenomenon is known as multiple scattering, and this book is the first devoted to the subject as mentioned in this paper, and the author covers a variety of techniques, describing first the single-obstacle methods and then extending them to the multiple-obsstacle case.
Abstract: The interaction of waves with obstacles is an everyday phenomenon in science and engineering, arising for example in acoustics, electromagnetism, seismology and hydrodynamics. The mathematical theory and technology needed to understand the phenomenon is known as multiple scattering, and this book is the first devoted to the subject. The author covers a variety of techniques, describing first the single-obstacle methods and then extending them to the multiple-obstacle case. A key ingredient in many of these extensions is an appropriate addition theorem: a coherent, thorough exposition of these theorems is given, and computational and numerical issues around them are explored. The application of these methods to different types of problems is also explained; in particular, sound waves, electromagnetic radiation, waves in solids and water waves. A comprehensive bibliography of some 1400 items rounds off the book, which will be an essential reference on the topic for applied mathematicians, physicists and engineers.

355 citations