Evaluating the effectiveness of contour-felled log erosion barriers as a post-fire runoff and erosion mitigation treatment in the western United States
Evaluating the effectiveness of contour-felled log erosion barriers as a post-fire runoff and erosion mitigation treatment in the western United States
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评估等高采伐原木侵蚀屏障作为美国西部火灾后径流和侵蚀缓解处理的有效性
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发表时间：
2008
期刊：
影响因子：
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通讯作者：
J. Beyers
中科院分区：
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作者：
P. Robichaud;J. Wagenbrenner;Raeford E. Brown;P. Wohlgemuth;J. Beyers
在1998年至2002年期间，在美国西部的大野火之后立即建立了六个站点，以确定轮廓砍伐原木侵蚀屏障在减轻野火后径流和侵蚀方面的有效性。在每一对匹配的，燃烧，小流域（1-13公顷），一个被视为轮廓砍伐日志侵蚀障碍，一个是未经处理的控制。火灾后4至6年，径流和泥沙产量进行了测量，并与降雨特性。高强度降雨产生的大部分测得的径流量和泥沙产量，但在南部加州网站，长时间的降雨事件产生的大部分径流和侵蚀。对于小的降雨事件（小于2年的重现期为10分钟的持续时间），径流，洪峰流量和产沙量在处理流域比在控制流域，但没有处理效果的降雨事件与较大的重现期。不正确的安装和退化随着时间的推移降低了轮廓砍伐日志侵蚀屏障的有效性。在选择等高砍伐原木防蚀屏障进行火灾后山坡巩固工程之前，应仔细考虑降雨特性和安装程序。
Between 1998 and 2002, six sites were established immediately after large wildfires in the western United States to determine the effectiveness of contour-felled log erosion barriers in mitigating post-wildfire runoff and erosion. In each pair of matched, burned, and small watersheds (1-13 ha), one was treated with contour-felled log erosion barriers and one was left untreated as a control. For 4 to 6 post-fire years, runoff and sediment yields were measured and correlated with rain properties. High-intensity rainfall produced most of the measured runoff and sediment yields except in the southern California site, where long-duration rain events produced most of the runoff and erosion. For small rain events (less than the 2-year return period for the 10-min duration), the runoff, peak flows, and sediment yields were lower in the treated watersheds than in the control watersheds, but there was no treatment effect for rain events with larger return periods. Improper installation and degradation over time reduced the effectiveness of contour-felled log erosion barriers. Rainfall characteristics and installation procedures should be carefully considered before choosing contour-felled log erosion barriers for post-fire hillslope stabilisation.