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Architectural and chronostratigraphic analysis of a modern point bar: Powder River, Montana, USA
Warwick, Blake Michael,author.
Warwick, Blake Michael,author.
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2018
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Abstract
Due to the logistical challenges and the dynamic nature of fluvial systems, studying modern point bar deposits over formative time is difficult. The lack of accurate sediment-package dating makes it difficult to compare sedimentation rates to actual chronostratigraphic events such as floods. This study combines photogrammetry, mapped surface migration, a survey of sediment elevation change, a trench, and water discharge rates to develop a more complete understanding of how a point bar forms on an annual scale. The Powder River, Montana, USA, has little influence from engineering and offers a unique opportunity to study a seasonally exposed point bar. The study area is along the Powder River between Moorhead, Montana, USA, and Broadus, Montana, USA. The Powder River is a northward flowing, meandering river that is sourced from the Bighorn Mountains in northeast Wyoming, USA and is a tributary to the Yellowstone River. Point bar PR141A, the focus of this study, is the result of the neck cut-off of point bar PR141 during a 50-year flood in 1978. This study reconstructs the growth of point bar PR141A, its discrete accretionary architecture at the scale of years, and determines the inter-relationship between annual flooding events and bar accretion.
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1 online resource (x, 121 pages) :
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Geological Sciences