Interactions between Slope and Lake Sedimentary Processes: Study from Aerial Imagery and Ground Penetrating Radar Survey In the Alps of New Zealand
Year: 2013
Type: article
Abstract: Lake Pearson is an alpine lake located amid a paraglacial landscape subject to accelerated rates of erosion, in the Upper Waimakariri Basin, South Island, New Zealand. Preliminary research into the shallow subsurface has been conducted with the use of ground-penetrating radar, supplemented with observation of surface sedimentology and landscape features. Distinct subsurface structures have been found beneath sections of Craigieburn Fan and the southern bed of Lake Pearson and the geomorphic processes responsible for the formation of each of these structures have been interpreted. Radargrams display evidence of avulsion of Craigieburn Stream, with the identification of several palaeochannels beneath the western side of Craigieburn Fan. Buried slope deposits at the base of Purple Hill show historic hill slope erosion and suggest hill slope stability is strongly linked to surface vegetation. Foreset bedding and onlap sedimentary sequences provide depositional evidence of lake level rise and lake currents have been identified as having a role in redistribution of fine sediment. Craigieburn Stream is the largest source of sediment to the area, though avulsion of the stream and progradation of Craigieburn Fan occurs on an episodical basis, in accordance with sediment availability and high stream flows capable of shifting large volumes of sediment. ha l-0
Language: English
Subfield: Earth-Surface Processes
Field: Earth and Planetary Sciences
Domain: Physical Sciences
Open Access status: green
OpenAlex ID: W2906653361