|Water tables in Slipway Beach, Lake Manapouri: controls and effects on the beach system|
Pickrill, R.A. (1978). Water tables in Slipway Beach, Lake Manapouri: controls and effects on the beach system. N.Z. J. Mar. Freshwat. Res. 12(1): 51-57
In: New Zealand Journal of Marine and Freshwater Research. Royal Society of New Zealand: Wellington. ISSN 0028-8330, more
Lake morphology; Water levels (lakes); Fresh water
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The results from a continuous 42-d study of water table levels in Slipway Beach, Lake Manapouri, 12 November-23 December 1974, are described, and correlation and multiple regression analyses are used to identify controlling processes. Groundwater fluctuations are largest on the upper and lower foreshore, where the elapsed rainfall and position of the shoreline are the dominant controls. Fluctuations are smallest in the mid foreshore; this pattern is the reverse of that found in oceanic beaches where tidal oscillations in sea level control the level of the water table in the foreshore. Beach morphology is affected by the groundwater in two ways: spring sapping of the water table from the top of the foreshore during heavy rains produces rill channels, and shore-normal exchanges of sediment associated with changes in lake level are accelerated.