Indra Jayewardene

• Manly Hydraulics Laboratory New South Wales

None of the established formulae for breakwater armour stone stability, Hudson (1958) or van der Meer (1987), explicitly account for the water depth at the toe of the structure. More recently, Hughes (2004), Melby and Hughes (2004), Melby and Kobayashi (2011) have developed equations for stability and runup utilising the concept of wave momentum fl...

Coastal process understanding is based on observations of physical processes in the field and laboratory from which theories are developed. Theories may be expressed mathematically and coded into numerical models. Compared with the cost of field data acquisition and laboratory experiments, the cost of numerical modelling is often perceived to be lo...

Prior to completion of entrance improvements in 2007, Lake Illawarra behaved as an ICOLL (intermittently closed and open lakes and lagoons) with entrance conditions dependent on prevailing conditions. Since construction of twin training breakwaters and dredging in 2007, the entrance has remained permanently open, with water level stations within th...

NSW Public Works' Manly Hydraulics Laboratory (MHL) has on several occasions utilised physical modelling and numerical modelling to estimate forces for design specifications of maritime structures. Often linear wave theory is utilised to estimate the accuracy of force measurement due to waves in a wave flume. The non-linearity of a wave and the app...

Over the past 40 years, many of the breakwaters and revetments on the New South Wales coast have been constructed, repaired, or upgraded with concrete armour units. Since the early 1980s the most widely used armour unit has been the Hanbar. Whilst several applications of the Hanbar unit have been physically modelled, there has been no broad researc...

100 Years of Experience In a High Energy Wave Climate This paper uses the examples of Coffs Harbour breakwaters and the training wall head on the Richmond River at Ballina to outline some of the developments in coastal engineering design and construction over the last century. Most of the 63 major structures along the New South Wales (NSW) coastlin...

This paper uses the examples of Coffs Harbour breakwaters and the training wall head on the Richmond River at Ballina to outline some of the developments in coastal engineering design and construction over the last century. Most of the 63 major structures along the New South Wales (NSW) coastline are similar. Recent developments in data collection...

One dimensional spectral analysis of sea conditions indicate that biomodal spectra play a significant role in the Sri Lankan wave climate. The energy content and period of these modes differ in monsoonal and non monsoonal seas due to the influence of multiple swell trains and wind. In this paper, some of the more important ratios of wave parameters...