Abstract
Green water events may present different features in the initial stage of interaction with the deck of a structure. It is therefore important to investigate the evolution of different types of green water, since not all the events interact with the deck at the same time. In this paper, the evolution of three types of green water events (dam-break, plunging-dam-break, and hammer-fist) are studied. The water surface elevations and volumes over the deck in consecutive green water events, generated by incident [wave trains in a wave flume, were analyzed using image-based methods. The results show multiple-valued water surface elevations in the early stage of plunging-dam-break and hammer-fist type events. Detailed experimental measurements of this stage are shown for the first time. The effect of wave steepness on the duration of the events, maximum freeboard exceedance, and volumes were also investigated. Although the hammer-fist type showed high freeboard exceedances, the plunging-dam-break type presented the largest volumes over the deck. Some challenges for further assessments of green water propagation are reported.
Highlights
In ocean and offshore engineering, the phenomenon in which incident waves overtop structures and propagate over their decks is known as green water [1,2,3]
The work of [30] was recently extended by [17,33,34] to evaluate the water elevations in consecutive green water events generated by incident wave trains
Analysis of other parameters is still required to provide further knowledge concerning green water events on rectangular-shaped structures, such as the Multiple-valued water surface (MVWS) elevations observed in the generation of some events, the volumes over the deck, and the freeboard exceedances. The latter corresponds to the water elevations found at the start of the deck and are relevant data for the implementation of analytical and numerical models. To contribute to this gap, this paper extends the work of [12] to investigate the evolution of different types of green water events generated with incident wave trains in wave flume experiments
Summary
In ocean and offshore engineering, the phenomenon in which incident waves overtop structures and propagate over their decks is known as green water [1,2,3]. The work of [30] was recently extended by [17,33,34] to evaluate the water elevations in consecutive green water events generated by incident wave trains In those works, the use of the image-based method of [31] was used to obtain SVWS measurements from the experiments. The latter corresponds to the water elevations found at the start of the deck and are relevant data for the implementation of analytical and numerical models To contribute to this gap, this paper extends the work of [12] to investigate the evolution of different types of green water events generated with incident wave trains in wave flume experiments.
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