Simulating effects of timber harvesting on the temporal and spatial distribution of shallow landslides
Simulating effects of timber harvesting on the temporal and spatial distribution of shallow landslides
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模拟木材采伐对浅层滑坡时空分布的影响
DOI：
10.1127/zfg/43/1999/185
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发表时间：
1999
影响因子：
2.2
通讯作者：
Weimin Wu
中科院分区：
文献类型：
--
作者：
R. Sidle;Weimin Wu
一个分布式的，基于物理的边坡稳定性模型（dSLAM）被用来分析不同的木材采伐策略对斜坡稳定性的影响，在陡峭的，森林流域的俄勒冈州海岸山脉。模拟的时间分布的滑坡发生为一个单一的50%的皆伐是一致的，与以前的经验研究结果：大多数滑坡分布在一个时期内，约3-15年后的皆伐。在39，000次模拟暴雨中，有82次引发了山体滑坡。植被离开地区，管理措施，用于减少滑坡发生在不稳定的部分拟议皆伐，被评为有效。模拟结果表明，破坏潜力的空间分布是由木材采伐和地下水运动的模式：具有高破坏潜力的地区是在网站的根强度低，地下水流量集中。最后，研究结果支持的假设，地貌空洞的位置，具有最高的潜在滑坡发生在陡峭的地形。
A distributed, physically-based slope stability model (dSLAM) was used to analyze the effects of different timber harvesting strategies on slope stability in a steep, forested drainage in the Oregon Coast Ranges. The simulated temporal distribution of landslide occurrence for a single 50% clearcut is consistent with previous empirical findings: most landslides are distributed in a period of about 3-15 yr after the clearcut. Of the 39,000 simulated rainstorms, 82 triggered landslides. Vegetation leave areas, management measures used to reduce landslide occurrence in unstable portions of proposed clearcuts, were evaluated as effective. The simulations indicate that the spatial distribution of failure potential is determined by patterns of timber harvesting and groundwater movement: areas with high failure potential were in sites where root strength is low and groundwater flow concentrates. Finally, results support the hypothesis that geomorphic hollows are positions that have highest potential of landslide occurrence in steep terrain.