4.2 Article

Landscape response to hydroclimate variability shown by the post-Bonneville Flood (ca. 18 ka) fluvial-geomorphic history of the middle Snake River, Idaho, USA

期刊

QUATERNARY RESEARCH
卷 113, 期 -, 页码 29-51

出版社

CAMBRIDGE UNIV PRESS
DOI: 10.1017/qua.2022.60

关键词

Latest Pleistocene; Holocene; Snake River; Paleohydrology; Hydroclimate variability; Fluvial aggradation

向作者/读者索取更多资源

The fluvial geomorphology and stratigraphy at Bancroft Springs in Idaho indicate multiple episodes of aggradation and incision of the Snake River since the Bonneville Flood. The presence of seven terraces and their ages suggest variations in sediment supply and hydroclimate changes. The fluvial record and dating techniques provide insights into the sensitivity of large river systems to hydroclimate variability and contribute to understanding paleoenvironmental conditions.
The fluvial geomorphology and stratigraphy on the middle Snake River at Bancroft Springs, Idaho, provide evidence for numerous episodes of Snake River aggradation and incision since the Bonneville Flood at ca. 18 ka. A suite of seven terraces ranging from 20-1 m above modern bankfull elevation records multiple cut-and-fill cycles during the latest Pleistocene and Holocene in response to local base-level controls, variations in sediment supply, and hydroclimate change. Radiocarbon and luminescence dating show that the ages of fluvial aggradation generally coincide with increased sediment supply and likely wetter hydroclimate during onset of the Younger Dryas stadial (ca. 13.2 ka), deglaciation and termination of the Younger Dryas stadial (ca. 11.3 ka), Early Holocene cooling (ca. 8.8 ka), and Neoglacial (ca. 4.5, 2.9, 1.1 ka). Six intervening periods of incision and channel stability may also reflect either reduced sediment supply, drier hydroclimate, or both. The terrace chronology can be correlated to a variety of local and regional paleoclimate proxy records and corresponds well with periods of continental- and global-scale rapid climate change during the Holocene. The fluvial record demonstrates the geomorphic response and sensitivity of large river systems to changes in hydroclimate variability, which has important implications for inferring paleoenvironmental conditions in the region.

作者

我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。

评论

主要评分

4.2
评分不足

次要评分

新颖性
-
重要性
-
科学严谨性
-
评价这篇论文

推荐

暂无数据
暂无数据