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高能洪水沉积研究综述 王

高能洪水沉积研究综述 王
高能洪水沉积研究综述 王
Discoveries of cataclysmic glacial lake outburst floods have expanded the scale and frequency of known mass transport events on Earth and other planets. It has been realized that sedimentary deposits related to high-energy freshwater floods are widespread across continents and these deposits share some commonalities when compared carefully. However, the identification and sophisticated reconstruction of
these high-energy flood events require well-conditioned stratigraphic models of depositional successions, yet such models are still lacking. Thus, the primary purpose of this paper is to examine and condense the published stratigraphic and sedimentological evidence to identify the key signatures of megaflood successions. The deposits are often the only record of a flood; therefore, the secondary purpose is to interpret the sedimentary sequences in order to reconstruct the behavior and dynamics of a single and multiple flood events. The deposits of high-energy floods are usually massive and extensive, exhibiting sedimentary structures such as amalgamation, rhythmicity, outsized clasts, intraclasts, and obstacle marks. Typical sedimentary successions of high-energy floods include basal coarse parallel-bedded units, large-scale clinoforms, horizontally bedded
thin laminated units, ripple and dune cross-beds, silt beds, and debris flow deposits. Such a succession is usually dominated by high concentration suspension rain-outs, representing a single cycle of waxing and waning flood flow. Clay and silt are generally sparse or absent and are transported further down the system. At the scale of the hydrograph, the successions indicate that flows initially accelerate and then decelerate,
with significantly shorter periods of flow pulses also evident in the sedimentary signatures.
high-energy flood; hydrologic characteristics; sedimentological characteristics; typical succession
Wang, Hao
d6cd6bc1-45b7-43a8-92de-9b8dcae4d1c4
Cui, Peng
6aa87a0d-3682-44b8-9c9f-1510e5fcebda
Carling, Paul
8d252dd9-3c88-4803-81cc-c2ec4c6fa687
Wang, Hao
d6cd6bc1-45b7-43a8-92de-9b8dcae4d1c4
Cui, Peng
6aa87a0d-3682-44b8-9c9f-1510e5fcebda
Carling, Paul
8d252dd9-3c88-4803-81cc-c2ec4c6fa687

Wang, Hao, Cui, Peng and Carling, Paul (2020) 高能洪水沉积研究综述 王. Frontiers in Earth Science, 28 (2).

Record type: Article

Abstract

Discoveries of cataclysmic glacial lake outburst floods have expanded the scale and frequency of known mass transport events on Earth and other planets. It has been realized that sedimentary deposits related to high-energy freshwater floods are widespread across continents and these deposits share some commonalities when compared carefully. However, the identification and sophisticated reconstruction of
these high-energy flood events require well-conditioned stratigraphic models of depositional successions, yet such models are still lacking. Thus, the primary purpose of this paper is to examine and condense the published stratigraphic and sedimentological evidence to identify the key signatures of megaflood successions. The deposits are often the only record of a flood; therefore, the secondary purpose is to interpret the sedimentary sequences in order to reconstruct the behavior and dynamics of a single and multiple flood events. The deposits of high-energy floods are usually massive and extensive, exhibiting sedimentary structures such as amalgamation, rhythmicity, outsized clasts, intraclasts, and obstacle marks. Typical sedimentary successions of high-energy floods include basal coarse parallel-bedded units, large-scale clinoforms, horizontally bedded
thin laminated units, ripple and dune cross-beds, silt beds, and debris flow deposits. Such a succession is usually dominated by high concentration suspension rain-outs, representing a single cycle of waxing and waning flood flow. Clay and silt are generally sparse or absent and are transported further down the system. At the scale of the hydrograph, the successions indicate that flows initially accelerate and then decelerate,
with significantly shorter periods of flow pulses also evident in the sedimentary signatures.

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More information

Published date: 17 September 2020
Alternative titles: The sedimentology of high-energy outburst flood deposits: an overview.
Keywords: high-energy flood; hydrologic characteristics; sedimentological characteristics; typical succession

Identifiers

Local EPrints ID: 448886
URI: http://eprints.soton.ac.uk/id/eprint/448886
PURE UUID: 223ded16-b21f-4dba-9041-d3801489bd94

Catalogue record

Date deposited: 07 May 2021 16:35
Last modified: 07 May 2021 16:35

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Contributors

Author: Hao Wang
Author: Peng Cui
Author: Paul Carling

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