期刊
PERMAFROST AND PERIGLACIAL PROCESSES
卷 17, 期 4, 页码 325-339出版社
WILEY
DOI: 10.1002/ppp.569
关键词
riverbank erosion; freeze-thaw action; seasonal frost; mountain stream; field monitoring
Processes of riverbank erosion involve fluvial entrainment, mass failure and subaerial erosion. The role of freeze-thaw action in these erosion processes was investigated along a small mountain stream in a region with seasonal frost. Riverbank profiles, horizontal erosion, soil temperature, frost depth and soil water content were monitored over 20 months including two winters. Diurnal and annual freeze-thaw action directly triggers subaerial erosion and indirectly contributes to mass failure and fluvial entrainment. The rate of subaerial erosion reaches a maximum during the thawing period, reinforced by increasing water content and decreasing soil hardness. The subaerial erosion, which occurs uniformly along the riverbank and recurs every year, contributes to progressive deepening of a notch developed above the water level as both preparatory and erosive processes. The overdeepening of the notch decreases bank stability, followed by occasional mass failure immediately after the thawing period and periodic fluvial entrainment during the summer flood period. The annual amount of subaerial erosion is comparable to that of fluvial entrainment. These observations demonstrate that freeze-thaw erosion plays a fundamental role in erosion of riverbanks subject to deep seasonal frost. Copyright (C) 2006 John Wiley & Sons, Ltd.
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。
推荐
暂无数据