Long period edge waves off Southern Africa

Sedimentological evidence for seiching in a swell-dominated headland-bay system: Table Bay, Western Cape, South Africa

“…Wilson (1954) discounted the Southeaster as having any influence on oscillatory motions in the bay, and instead favoured barometric pressure oscillations as the trigger mechanism for seiching. This would be in line with the so-called coastal-trapped waves observed by, for example, Schumann (1983) and Shillington (1984) who associated them with barometric pressure variations caused by low-pressure systems passing the subcontinent during the winter months. Approaching the coast from the west, the lowpresssure systems are diverted southwards around the Cape Peninsula to continue along the south and east coasts of South Africa (Schumann 1983).…”

“…Approaching the coast from the west, the lowpresssure systems are diverted southwards around the Cape Peninsula to continue along the south and east coasts of South Africa (Schumann 1983). Whilst moving southwards, the successive pressure-induced coastal waves are intercepted in Table Bay where they are reflected to produce standing waves or seiches (Shillington 1984). According to Merian (1828;cf.…”

“…barometric) pressure fluctuations. This earlier work was continued by Harris et al (1972), Shillington and Harris (1978), Shillington (1982Shillington ( , 1984 and Schumann (1983) who recognised that, near the coast, the long-period waves could be described as coastal trapped waves associated with the passage of low pressure systems, especially during the southern winter season (May-September). Based on a permanent waverider buoy installed at 70 m water depth west of the Cape Peninsula, predominant wave periods were found to range from 8-12 s which, in Table Bay, were associated with significant wave heights of 2-5 m (Fig.…”

Sedimentological evidence for seiching in a swell-dominated headland-bay system: Table Bay, Western Cape, South Africa

“…Wilson (1954) discounted the Southeaster as having any influence on oscillatory motions in the bay, and instead favoured barometric pressure oscillations as the trigger mechanism for seiching. This would be in line with the so-called coastal-trapped waves observed by, for example, Schumann (1983) and Shillington (1984) who associated them with barometric pressure variations caused by low-pressure systems passing the subcontinent during the winter months. Approaching the coast from the west, the lowpresssure systems are diverted southwards around the Cape Peninsula to continue along the south and east coasts of South Africa (Schumann 1983).…”

“…Approaching the coast from the west, the lowpresssure systems are diverted southwards around the Cape Peninsula to continue along the south and east coasts of South Africa (Schumann 1983). Whilst moving southwards, the successive pressure-induced coastal waves are intercepted in Table Bay where they are reflected to produce standing waves or seiches (Shillington 1984). According to Merian (1828;cf.…”

“…barometric) pressure fluctuations. This earlier work was continued by Harris et al (1972), Shillington and Harris (1978), Shillington (1982Shillington ( , 1984 and Schumann (1983) who recognised that, near the coast, the long-period waves could be described as coastal trapped waves associated with the passage of low pressure systems, especially during the southern winter season (May-September). Based on a permanent waverider buoy installed at 70 m water depth west of the Cape Peninsula, predominant wave periods were found to range from 8-12 s which, in Table Bay, were associated with significant wave heights of 2-5 m (Fig.…”

Meteotsunamis Generated by Thunderstorms

“…The bottom slope determines the number of possible edge wave modes, and height decay is proportional to the alongshore wave number (Ursell, 1952). The propagating pressure jumps propagating parallel to the coast excite fundamental mode edge waves (Greenspan, 1956;Shillington, 1984;Shillington & Van Foreest, 1986). Vilibić and Šepić (2009) showed Greenspan resonance affected the strength of meteotsunamis along the central Adriatic coast.…”

Meteotsunamis at global scale: problems of event identification, parameterization and cataloguing

“…Inset figure shows the event distribution over the validity index 1 3 close-up studies devoted to the systematic search of historical data and of traces of meteotsunamis on mareograph records. Examples are the UK coast ; Thompson et al 2020), the south-west coast of Australia Wijeratne 2014, 2015), the north-east coast of Argentina and south-east coast of Brazil (Dragani et al 2014;Candella 2009; Candella and Araujo 2020), South Africa (Shillington 1984;Okal et al 2014), and the north-eastern part of the Baltic Sea (Pellikka et al 2014(Pellikka et al , 2020.…”

Sedimentological evidence for seiching in a swell-dominated headland-bay system: Table Bay, Western Cape, South Africa

“…Wilson (1954) discounted the Southeaster as having any influence on oscillatory motions in the bay, and instead favoured barometric pressure oscillations as the trigger mechanism for seiching. This would be in line with the so-called coastal-trapped waves observed by, for example, Schumann (1983) and Shillington (1984) who associated them with barometric pressure variations caused by low-pressure systems passing the subcontinent during the winter months. Approaching the coast from the west, the lowpresssure systems are diverted southwards around the Cape Peninsula to continue along the south and east coasts of South Africa (Schumann 1983).…”

“…Approaching the coast from the west, the lowpresssure systems are diverted southwards around the Cape Peninsula to continue along the south and east coasts of South Africa (Schumann 1983). Whilst moving southwards, the successive pressure-induced coastal waves are intercepted in Table Bay where they are reflected to produce standing waves or seiches (Shillington 1984). According to Merian (1828;cf.…”

“…barometric) pressure fluctuations. This earlier work was continued by Harris et al (1972), Shillington and Harris (1978), Shillington (1982Shillington ( , 1984 and Schumann (1983) who recognised that, near the coast, the long-period waves could be described as coastal trapped waves associated with the passage of low pressure systems, especially during the southern winter season (May-September). Based on a permanent waverider buoy installed at 70 m water depth west of the Cape Peninsula, predominant wave periods were found to range from 8-12 s which, in Table Bay, were associated with significant wave heights of 2-5 m (Fig.…”

Meteotsunamis Generated by Thunderstorms

“…The bottom slope determines the number of possible edge wave modes, and height decay is proportional to the alongshore wave number (Ursell, 1952). The propagating pressure jumps propagating parallel to the coast excite fundamental mode edge waves (Greenspan, 1956;Shillington, 1984;Shillington & Van Foreest, 1986). Vilibić and Šepić (2009) showed Greenspan resonance affected the strength of meteotsunamis along the central Adriatic coast.…”

Meteotsunamis at global scale: problems of event identification, parameterization and cataloguing

“…Inset figure shows the event distribution over the validity index 1 3 close-up studies devoted to the systematic search of historical data and of traces of meteotsunamis on mareograph records. Examples are the UK coast ; Thompson et al 2020), the south-west coast of Australia Wijeratne 2014, 2015), the north-east coast of Argentina and south-east coast of Brazil (Dragani et al 2014;Candella 2009; Candella and Araujo 2020), South Africa (Shillington 1984;Okal et al 2014), and the north-eastern part of the Baltic Sea (Pellikka et al 2014(Pellikka et al , 2020.…”

Sedimentological evidence for seiching in a swell-dominated headland-bay system: Table Bay, Western Cape, South Africa

“…Wilson (1954) discounted the Southeaster as having any influence on oscillatory motions in the bay, and instead favoured barometric pressure oscillations as the trigger mechanism for seiching. This would be in line with the so-called coastal-trapped waves observed by, for example, Schumann (1983) and Shillington (1984) who associated them with barometric pressure variations caused by low-pressure systems passing the subcontinent during the winter months. Approaching the coast from the west, the lowpresssure systems are diverted southwards around the Cape Peninsula to continue along the south and east coasts of South Africa (Schumann 1983).…”

“…Approaching the coast from the west, the lowpresssure systems are diverted southwards around the Cape Peninsula to continue along the south and east coasts of South Africa (Schumann 1983). Whilst moving southwards, the successive pressure-induced coastal waves are intercepted in Table Bay where they are reflected to produce standing waves or seiches (Shillington 1984). According to Merian (1828;cf.…”

“…barometric) pressure fluctuations. This earlier work was continued by Harris et al (1972), Shillington and Harris (1978), Shillington (1982Shillington ( , 1984 and Schumann (1983) who recognised that, near the coast, the long-period waves could be described as coastal trapped waves associated with the passage of low pressure systems, especially during the southern winter season (May-September). Based on a permanent waverider buoy installed at 70 m water depth west of the Cape Peninsula, predominant wave periods were found to range from 8-12 s which, in Table Bay, were associated with significant wave heights of 2-5 m (Fig.…”

Meteotsunamis Generated by Thunderstorms

“…The bottom slope determines the number of possible edge wave modes, and height decay is proportional to the alongshore wave number (Ursell, 1952). The propagating pressure jumps propagating parallel to the coast excite fundamental mode edge waves (Greenspan, 1956;Shillington, 1984;Shillington & Van Foreest, 1986). Vilibić and Šepić (2009) showed Greenspan resonance affected the strength of meteotsunamis along the central Adriatic coast.…”

Meteotsunamis at global scale: problems of event identification, parameterization and cataloguing

“…Inset figure shows the event distribution over the validity index 1 3 close-up studies devoted to the systematic search of historical data and of traces of meteotsunamis on mareograph records. Examples are the UK coast ; Thompson et al 2020), the south-west coast of Australia Wijeratne 2014, 2015), the north-east coast of Argentina and south-east coast of Brazil (Dragani et al 2014;Candella 2009; Candella and Araujo 2020), South Africa (Shillington 1984;Okal et al 2014), and the north-eastern part of the Baltic Sea (Pellikka et al 2014(Pellikka et al , 2020.…”