Catastrophic flood disturbance and a community's response to plant resilience in the heart of the Texas Hill Country

Catastrophic flood disturbance and a community's response to plant resilience in the heart of the Texas Hill Country
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德克萨斯丘陵地区中心地带的灾难性洪水扰动以及社区对植物恢复能力的反应

DOI:
10.1016/j.geomorph.2017.09.009
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发表时间:
2018
期刊:
影响因子:
3.9
通讯作者:
Julian, Jason P.
Julian, Jason P.
中科院分区:
地球科学2区
文献类型:
--
作者:
Meitzen, Kimberly M.;Phillips, John N.;Perkins, Thaïs;Manning, Aspen;Julian, Jason P.

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布兰科河流经美国得克萨斯州中部的石灰岩巴尔科内斯高地,2015年5月发生了灾难性的洪水,导致其河岸走廊受到严重的地貌干扰。利用洪水前后55公里河段的高分辨率航空和卫星图像绘制了扰动模式图,并按严重程度对扰动模式进行了分类,从完全的洪泛区剥离到无扰动。最严重的干扰发生在河道附近的泄洪道,并随着横向距离的减少,进入100年和500年的洪泛区。先前在文献中确定的扰动模式包括曲流冲刷、平行斜槽冲刷、凸岸侵蚀和宏观湍流冲刷,均在此事件后出现,以及支流汇流附近的大量扰动。在这一事件之后,当地的一个非营利组织TreeFolks与社区合作,积极在公共和私人土地上重新种植和恢复布兰科河的河岸走廊。这些重新造林的努力补充了河岸走廊的自然被动恢复,使系统能够更快地恢复,并对未来的洪水事件具有弹性。
The Blanco River, which flows through the limestone Balcones Canyonlands of central Texas (USA), experienced catastrophic flooding in May 2015 that resulted in significant biogeomorphic disturbance to its riparian corridor. High-resolution aerial and satellite imagery from pre- and post-flooding for a 55-km reach of river were used to map and categorize patterns of disturbance by degree of severity ranging from complete floodplain stripping to no disturbance. The most severe disturbance occurred within the floodway near the channel and decreased with lateral distance into the 100- and 500-year floodplains. Disturbance patterns previously identified in the literature including meander scour, parallel chute scour, convex bank erosion, and macroturbulent scour were all present following this event, as well as substantial disturbance proximal to tributary confluences. In the aftermath of this event, TreeFolks, a local nonprofit organization, engaged with the community to actively replant and restore the riparian corridor of the Blanco River on public and private lands. These reforestation efforts supplement the natural passive recovery of the riparian corridor, enabling the system to recover more quickly and be resilient to future flood events.
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