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DOI | 10.1029/2019GL085910 |
Preserved Fluvial Cross Strata Record Bedform Disequilibrium Dynamics | |
Leary, Kate C. P.1; Ganti, Vamsi1,2 | |
2020-01-28 | |
发表期刊 | GEOPHYSICAL RESEARCH LETTERS |
ISSN | 0094-8276 |
EISSN | 1944-8007 |
出版年 | 2020 |
卷号 | 47期号:2 |
文章类型 | Article |
语种 | 英语 |
国家 | USA |
英文摘要 | Fluvial cross strata are an archive of ancient river morphodynamics. Controls on their preservation are well documented for bedforms equilibrated with prevailing flows; however, variability in water and sediment discharge results in bedforms that are routinely out of phase with flow conditions-termed bedform disequilibrium. Using theory and experiments of dune evolution in steady and unsteady flows, we show that preservation of cross strata is greater during unsteady flows-particularly during flood recession-when bedform disequilibrium is prevalent. The enhanced preservation of disequilibrium dynamics is associated with a high bedform preservation ratio, which results from localized increase in sedimentation rates relative to bedform migration rates due to the hierarchical bedform organization during flood recession. We find that the coefficient of variation of cross sets reflects the ratio of the time scales of formative-flood variability and bedform adjustment. We parameterize bedform disequilibrium for rivers globally and suggest that flood variability is a key control on cross set preservation. |
英文关键词 | flood variability cross-stratified sandstones bedform hysteresis deep time |
领域 | 气候变化 |
收录类别 | SCI-E |
WOS记录号 | WOS:000517154600013 |
WOS关键词 | SEDIMENTARY STRUCTURES ; SUBAQUEOUS DUNES ; RHINE RIVER ; GRAVEL-BED ; MIGRATION ; TRANSPORT ; SAND ; GROWTH ; FLOODS ; WAVES |
WOS类目 | Geosciences, Multidisciplinary |
WOS研究方向 | Geology |
引用统计 | |
文献类型 | 期刊论文 |
条目标识符 | http://119.78.100.173/C666/handle/2XK7JSWQ/279544 |
专题 | 气候变化 |
作者单位 | 1.Univ Calif Santa Barbara, Dept Geog, Santa Barbara, CA 93106 USA; 2.Univ Calif Santa Barbara, Dept Earth Sci, Santa Barbara, CA 93106 USA |
推荐引用方式 GB/T 7714 | Leary, Kate C. P.,Ganti, Vamsi. Preserved Fluvial Cross Strata Record Bedform Disequilibrium Dynamics[J]. GEOPHYSICAL RESEARCH LETTERS,2020,47(2). |
APA | Leary, Kate C. P.,&Ganti, Vamsi.(2020).Preserved Fluvial Cross Strata Record Bedform Disequilibrium Dynamics.GEOPHYSICAL RESEARCH LETTERS,47(2). |
MLA | Leary, Kate C. P.,et al."Preserved Fluvial Cross Strata Record Bedform Disequilibrium Dynamics".GEOPHYSICAL RESEARCH LETTERS 47.2(2020). |
条目包含的文件 | 条目无相关文件。 |
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