Browsing by Author "Fernando, KPM"

Now showing 1 - 3 of 3

item: Thesis-Abstract
Hydraulic performance of statically stable berm breakwaters & gabion structures
Fernando, KPM; Hettiarachchi, SSL
The ability to predict the level of reflection, transmission and dissipation for various types of coastal structures plays an important role in the assessment of their hydraulic performance. These parameters together with the hydraulic, geotechnical and structural stability of the individual components and of the structure as a whole determine the overall performance of the structure. This study has done a literature review and presents the results from a study of the hydraulic performances especially on wave reflection and transmission characteristics of a wide range of structures (vertical, sloping and berm) used in harbour and coastal engineering. Hydraulic model test can provide reliable method to quantify many of the wave structure response functions for breakwaters. A detailed hydraulic model investigation (1:20) relating to the hydraulic performances of berm breakwater with berm width of 6m was done as a part of this study. It was tested in Lanka Hydraulic Institute (LHI), Katubedda, Moratuwa. The results are compared with a model investigation done on a berm structure with the berm width of 12m at a scale of 1:20 (also tested in Lanka Hydraulic Institute in 1999) and Allsop and Channel (berm widths of 4m, 8m and 16m) test sections. The investigations were designed to obtain a full profile of the energy dissipation characteristics of the structures tested, including the damping of waves as they propagate through the structure.
item: Conference-Extended-Abstract
Investigations of wave reflection and transmission through berm structures
(2006) Fernando, KPM; Hettiarachchi, SSL
A breakwater is designed to dissipate wave energy with due attention focused on hydraulic, geotechnical and structural stability. The use of physical models is the principal method for investigating experimentally the performance of breakwaters. Research on the design and construction of breakwaters has led to the development of new concepts and further examination of alternative design practices. One such alternative is the use of the berm breakwaters. In berm breakwaters, the hydraulics of wave structure interaction plays a vital role in the dissipation of wave energy. It is therefore evident that a detailed investigation of this subject using a large scale hydraulic model would provide information leading to improved design with respect to hydraulic efficiency and minimization of costs. The investigation was designed to obtain a complete profile of the energy dissipation characteristics of the structure, including damping of waves along the berm and its full structure.
item: Conference-Extended-Abstract
Investigations of wave reflection and transmission through gabion structures
(2004) Hettiarachchi, SSL; Amaraweera, R; Fernando, KPM
This paper presents results from investigations carried out on the hydraulic performance of gabion structures, with respect to wave energy reflection and transmission processes. The focus of the study was to investigate the wave reflection and transmission characteristics, which are important in designing coastal structures with respect to energy dissipation. The paper presents the results of three hydraulic model investigations on vertical gabion structures. The experiments were designed to obtain detailed information of transmission and reflection characteristics of the structures thereby providing a complete profile of wave energy dissipation along the structures. The experimental programmes were conducted using large physical models to minimize scale effects. The results are discussed in the context of economical design, improved hydraulic performance and long term stability.