Arid
DOI10.1017/qua.2017.98
Alluvial fan depositional records from north and south-facing catchments in semi-arid montane terrain
Poulos, Michael J.; Pierce, Jennifer L.
通讯作者Poulos, Michael J.
来源期刊QUATERNARY RESEARCH
ISSN0033-5894
EISSN1096-0287
出版年2018
卷号89期号:1页码:237-253
英文摘要

Valley asymmetry reflects differences in landform evolution with aspect; however, few studies assess rates and timing of asymmetric erosion. In south-central Idaho, we combine alluvial fan volume reconstructions with radiocarbon deposit dating to compare the source-catchment normalized fan deposition rates of catchments incised into north (n=5) and south-facing (n=3) valleys, which differ during the late Holocene from 7.7 to 10.1 mm/ka, respectively, but are not significantly different. South-facing catchments produced 1.3x more fan sediment per unit source-area during the late Holocene, whereas over the last 10 Ma they have evolved to be 2.1x larger with 2.8x greater eroded volumes and 7.6 degrees gentler slopes (24.5 degrees versus 32.1 degrees, average). Late Holocene differences in sediment yields with aspect cannot fully explain differences in landforms. Potential bias in sediment deposition and/or remobilization cannot fully explain the similarity of erosion rates during the late Holocene. Valley asymmetry appears to have developed primarily during different conditions. While valley asymmetry development may be quicker during glacial climates, development is likely accelerated early in a valley’s history, such as during initial valley incision, because asymmetric degradation serves as a negative feedback that reduces aspect-related differences in erosion and drives valleys towards steady state.


英文关键词Alluvial Fan Radiocarbon Lidar Holocene Aspect Valley Asymmetry Climate Idaho Batholith Semi-arid Montane
类型Article
语种英语
国家USA
收录类别SCI-E
WOS记录号WOS:000425965700016
WOS关键词YELLOWSTONE-NATIONAL-PARK ; IDAHO BATHOLITH ; SOUTHWESTERN IDAHO ; CLIMATIC CONTROLS ; VALLEY ASYMMETRY ; METEORIC BE-10 ; CRITICAL ZONE ; FIRE ; EROSION ; AGE
WOS类目Geography, Physical ; Geosciences, Multidisciplinary
WOS研究方向Physical Geography ; Geology
资源类型期刊论文
条目标识符http://119.78.100.177/qdio/handle/2XILL650/212488
作者单位Boise State Univ, Dept Geosci, 1910 Univ Dr, Boise, ID 83725 USA
推荐引用方式
GB/T 7714
Poulos, Michael J.,Pierce, Jennifer L.. Alluvial fan depositional records from north and south-facing catchments in semi-arid montane terrain[J],2018,89(1):237-253.
APA Poulos, Michael J.,&Pierce, Jennifer L..(2018).Alluvial fan depositional records from north and south-facing catchments in semi-arid montane terrain.QUATERNARY RESEARCH,89(1),237-253.
MLA Poulos, Michael J.,et al."Alluvial fan depositional records from north and south-facing catchments in semi-arid montane terrain".QUATERNARY RESEARCH 89.1(2018):237-253.
条目包含的文件
条目无相关文件。
个性服务
推荐该条目
保存到收藏夹
导出为Endnote文件
谷歌学术
谷歌学术中相似的文章
[Poulos, Michael J.]的文章
[Pierce, Jennifer L.]的文章
百度学术
百度学术中相似的文章
[Poulos, Michael J.]的文章
[Pierce, Jennifer L.]的文章
必应学术
必应学术中相似的文章
[Poulos, Michael J.]的文章
[Pierce, Jennifer L.]的文章
相关权益政策
暂无数据
收藏/分享

除非特别说明,本系统中所有内容都受版权保护,并保留所有权利。