Late Holocene development of a floodplain along a small meandering stream, northern Quebec, Canada

被引:10
|
作者
Boucher, Etienne
Arseneault, Dominique
Hetu, Bernard
机构
[1] Univ Quebec, Dept Biol Geog & Chim, Rimouski, PQ G5L 3A1, Canada
[2] Univ Quebec, Ctr Etud Nord, Rimouski, PQ G5L 3A1, Canada
基金
加拿大自然科学与工程研究理事会;
关键词
floodplain; fluvial geomorphology; meandering streams; boreal forest; buried trees; Holocene; northern Quebec;
D O I
10.1016/j.geomorph.2006.02.014
中图分类号
P9 [自然地理学];
学科分类号
0705 ; 070501 ;
摘要
This paper describes the activity of a small meandering stream and the development of its floodplain during the last 4600 years (calendar years BP) in the northern boreal zone of Quebec. Three trenches were excavated across the floodplain's full width and permitted the interpretation of morphosedimentary units in relation to modem analogs. Chronological controls within trenches was provided by the dendrochronological and radiocarbon dating of buried tree trunks. From 4600 to 2900 cal. BP and from 1000 to 120 cal. BP, the channel migrated and constructed its floodplain at very slow rates, mostly because of low flow velocities, vegetated streambanks and the cohesive texture of marine sediments reworked by the channel. Vertical accretion rates were extremely variable on the floodplain, with high rates proximal to the modem channel and low rates over distal (also older) portions of the floodplain. Following a major channel shift (meander cut-off or avulsion) around 2900 cal. BP, channel migration appears to have been constrained to a narrow zone adjacent to the modem channel. Within this constrained zone, the migrating channel has reworked its own sediments leading to a marked unconformity between 2900-1000 cal. BP. It is thought that underlying marine sediments protrusions, and perhaps the forested banks, protected older alluvial sediments from being eroded during the last three millenniums. Our study shows that small boreal floodplains may contain, in a very small area, abundant and diversified archives of their evolution. (c) 2006 Elsevier B.V. All rights reserved.
引用
收藏
页码:267 / 281
页数:15
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