Analysis of the abnormal winter situation in South Africa — June 1964

Stranz, D.

doi:10.1007/bf00875317

Cited by 3 publications

(4 citation statements)

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“…An example will suffice. Taljaard (1982) has shown that deep cold-core cut-off lows developing at the equatorward extensions of large-amplitude troughs in the westerlies were the most frequent cause of heavy rains over the period 1952-1981. It has not proved possible to isolate directly the annual effect of cut-off lows in the pressure data analysed.…”

Section: Discussionmentioning

confidence: 99%

“…INTRODUCTION Variations in regional atmospheric circulation and climate on a scale of years are usually associated with major adjustments in hemispheric circulation. Some examples of the sorts of variations that may occur are changing zonal wave patterns (Lamb, 1972;Hare, 1979;Trenberth, 1980;Tyson, 1981) and zonal and meridional flow characteristics (Lamb, 1972;Dzerdzeevski, 1971), variations in the interrelated Southern Oscillation, zonal Walker and meridional Hadley circulations (Kyle et al, 1970;Newell et al, 1974), alterations in the links between tropical Atlantic and mid-latitude circulations (Pittock, 1980) and changes in the nature of lower troposphere jets (Newel1 and Kidson, 1984). Few explanations have been proffered to explain year-to-year variations in climate, and particularly rainfall, over southern Africa.…”

mentioning

confidence: 99%

“…Synoptic classifications of daily surface synoptic conditions have been provided by Vowinckel (1955) and Longley (1976). Accounts of wet and dry spells of a few days duration have been given by Hofmeyr and Gouws (1964), Stranz and Taljaard (1965), Hayward and Van Den Berg (1970), De Villiers (1976), Estie (1981) and many others. Synoptic explanations for wet and dry spells on time scales of more than a few days to whole seasons are to be found in the work of Rubin (1956), King and Van Loon (1958), Triegaardt and Kits (1963), Taljaard (1981), Tyson (1981), Dyer (1982), Taljaard (1982) and Harrison (1984).…”

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confidence: 99%

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The atmospheric modulation of extended wet and dry spells over South Africa, 1958–1978

Tyson

1984

J. Climatol.

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Differences in annual geopotential heights at the 850 and 500mb levels between 16 pairs of stations have been submitted to principal component analysis to identify the most important statistically uncorrelated pressure patterns accounting for the variance of the annual pressure field over South Africa and adjacent oceans. By correlating component scores for the period 195819 to 197718 with annual rainfall an attempt has been made to determine the regional rainfall responses to variations in different circulation types. Regional variations in annual rainfall are shown to be significantly linked to variations in both low latitude forcing, associated with tropical easterly airflow and cyclonic wave perturbations therein, and mid-latitude forcing, associated with a variety of both cyclonic and anti-cyclonic perturbations in the westerlies. It has been shown that it is primarily variations in the atmospheric field of motion at the 500 mb level that are responsible for year-to-year differences in annual rainfall totals.

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Section: Discussionmentioning

confidence: 99%

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The atmospheric modulation of extended wet and dry spells over South Africa, 1958–1978

Tyson

1984

J. Climatol.

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“…This persisted for five days during which up to 800 mm of rain fell ( Figure 5). Cut-off lows are unstable baroclinic systems which slope to the west with increasing height (Stranz and Taljaard, 1965). They are associated with strong convergence and are responsible for many of the floodproducing rains over South Africa (Taljaard, 1982).…”

Section: Weather Conditions September 1987mentioning

confidence: 99%

Geomorphological effects of catastrophic flooding on a small subtropical Estuary

Cooper¹,

Mason

Reddering³

et al. 1990

Earth Surf Processes Landf

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The Mgeni Estuary is situated on the east coast of South Africa. Tidal salinity changes commonly extend 2.5 km upstream from the mouth. The subtropical climatic regime causes seasonal flooding, the geomorphological effects of which are increased by a steep river gradient. A 120-150 year flood event during September 1987, with an estimated peak discharge of 10800 cumecs, resulted in the erosion of 1.86 x lo6 m3 of sediment from the estuary. The normal high tide volume of the estuary (0.35 x lo6 m') increased to 1.85 x lo6 m3 after the flood. The post-flood intertidal volume (tidal prism) of the estuary was 0.43 x lo6 m3 compared to 0.19 x lo6 m3 before the event.The nature and extent of erosion in the estuary was controlled by the composition of the estuary banks and bed material. Gravel and sand substrates were preferentially eroded from the estuary bed before the cohesive bank materials were undercut in sections of the estuary. Mud and fine sand were deposited on overbank areas when the flood waned and a lag of coarse sand and gravel was produced on the estuary bed. Approximately 46 per cent of the bedload sediment supplied to the estuary since 1917 was retained in the estuary until the 1987 flood. The remainder was transported through the system and into the Indian Ocean. Results show that catastrophic floods play an important role in sedimentation in small estuaries

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Eccentric geomagnetic dipole potential

Winch

1968

Planetary and Space Science

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Analysis of the abnormal winter situation in South Africa — June 1964

Cited by 3 publications

References 1 publication

The atmospheric modulation of extended wet and dry spells over South Africa, 1958–1978

The atmospheric modulation of extended wet and dry spells over South Africa, 1958–1978

Geomorphological effects of catastrophic flooding on a small subtropical Estuary

Eccentric geomagnetic dipole potential

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