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      Sedimentation in an artificial lake -Lake Matahina, Bay of Plenty

      Phillips, Christopher J.; Nelson, Campbell S.
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      Sedimentation in an artificial lake.pdf
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       www.royalsociety.org.nz
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      Phillips, C.J. & Nelson, C.S. (1981). Sedimentation in an artificial lake -Lake Matahina, Bay of Plenty. New Zealand Journal of Marine and Freshwater Research, 15, 459-473.
      Permanent Research Commons link: https://hdl.handle.net/10289/4737
      Abstract
      Lake Matahina, an 8 km long hydroelectric storage reservoir, is a small (2.5 km2), 50 m deep, warm monomictic, gorge-type lake whose internal circulation is controlled by the inflowing Rangitaiki River which drains a greywacke and acid volcanic catchment. Three major proximal to distal subenvironments are defined for the lake on the basis of surficial sediment character and dominant depositional process: (a) fluvial-glassy, quartzofeld-spathic, and lithic gravel-sand mixtures deposited from contact and saltation loads in less than 3 m depth; (b) (pro-)deltaic-quartzofeldspathic and glassy sand-silt mixtures deposited from graded and uniform suspension loads in 3-20 m depth; and (c) basinal-diatomaceous, argillaceous, and glassy silt-clay mixtures deposited from uniform and pelagic suspension loads in 20-50 m depth. The delta face has been prograding into the lake at a rate of 35-40 m/year and vertical accretion rates in pro-delta areas are 15-20 cm/year. Basinal deposits are fed mainly from river plume dispersion involving overflows, interflows, and underflows, and by pelagic settling, and sedimentation rates behind the dam have averaged about 2 cm/year. Occasional fine sand layers in muds of basinal cores attest to density currents or underflows generated during river flooding flowing the length of the lake along a sublacustrine channel marking the position of the now submerged channel of the Rangitaiki River.
      Date
      1981
      Type
      Journal Article
      Rights
      This article has been published in the journal: New Zealand Journal of Marine and Freshwater Research. © 1981 The Royal Society of New Zealand.
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