首页 | 本学科首页   官方微博 | 高级检索  
     检索      


Hurricane-induced landslide activity on an alluvial fan along Meadow Run, Shenandoah Valley, Virginia (eastern USA)
Authors:Gerald F Wieczorek  L Scott Eaton  Thomas M Yanosky  Eric J Turner
Institution:(1) U.S. Geological Survey, Menlo Park, CA 94025, USA;(2) James Madison University, Harrisonburg, VA 22807, USA;(3) National Center, U.S. Geological Survey, Reston, VA 20192, USA;(4) Present address: 2121 Canyon Boulevard #405, Boulder, CO 80302, USA
Abstract:Although intense rainfall and localized flooding occurred as Hurricane Isabel tracked inland northwestardly across the Blue Ridge Mountains of central Virginia on September 18–19, 2003, few landslides occurred. However, the hurricane reactivated a dormant landslide along a bluff of an incised alluvial fan along Meadow Run on the western flanks of the Blue Ridge Mountains. Subsequent monitoring showed retrogressive movement involving several landslide blocks for the next several months. Using dendrochronology, aerial photography, and stream discharge records revealed periods of landslide activity. The annual variation of growth rings on trees within the landslide suggested previous slope instability in 1937, 1972, 1993, 1997, and 1999, which correlated with periods of local flood events. The avulsive and migrating nature of Meadow Run, combined with strong erosional force potential during flood stages, indicates that landslides are common along the bluff-channel bank interface, locally posing landslide hazards to relatively few structures within this farming region.
Keywords:Landslides  Hurricane Isabel  Dendrochronology  Retrogressive  Stream erosion  USA  Virginia  Shenandoah Valley
本文献已被 SpringerLink 等数据库收录!
设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号