Knowledge Resource Center for Ecological Environment in Arid Area
DOI | 10.1017/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
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ISSN | 0033-5894 |
EISSN | 1096-0287 |
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. |
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