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Depo sequence as tool to convert shoreline trajectory from space domain to time domain
Institution:1. Department of Earth Science, University of Bergen, Allegaten 41, N-5007 Bergen, Norway;2. Department of Geosciences, University of Oslo, P.O. Box 1047 Blindern, N-0316 Oslo, Norway;3. Geology Section, Department of Geosciences and Natural Resource Management, University of Copenhagen, Copenhagen, Denmark;4. GEOMAR, Wischhofstr. 1-3, D-24148 Kiel, Germany;5. Institute of Seismology and Volcanology, Hokkaido University, Sapporo, Japan
Abstract:Deposystems are complex and governed by discrete depo events with variable intervals of stasis or erosion in between. Since shoreface sediments indicate sea level, depo events of shoreline facies are discrete samples of sea level. Only if these samples are sufficiently regular and frequent will the shoreline trajectory in the space domain accurately reflect the sea-level curve in the time domain. This study presents a method to convert shoreline trajectory in the space domain to sea-level curve in the time domain from artificial miniature deltas. One obtains the depo sequence as function of time and uses it to: convert depo sequence from time-to space domain, correlate depo sequence to shoreline trajectory in the space domain, and convert shoreline trajectory from space-to time domain. For natural deltas one would extract the depo set in the frequency domain, i.e. the probability density function of stasis intervals between depo events from the experimental depo sequence and use it to: convert shoreline trajectory from space-to time domain, and infer a range of possible sea-level curves. This method therewith explicitly includes the uncertainty of the inferred sea-level curve.
Keywords:Delta  Mouth bar  Deposition  Hiatus  Shoreline  Sea level
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