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首页> 外文期刊>Catena: An Interdisciplinary Journal of Soil Science Hydrology-Geomorphology Focusing on Geoecology and Landscape Evolution >Frequency and spatial distribution of landslides in a mountainous drainage basin: Western Foothills, Taiwan
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Frequency and spatial distribution of landslides in a mountainous drainage basin: Western Foothills, Taiwan

机译：台湾山区西部丘陵山区流域滑坡的频率和空间分布

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摘要

Maps from 1904 and 1915 and air photographs from 1963, 1980, 1985, 1993 and 1996 provide a record of landslide incidence in a 92.1-km(2) drainage basin, a headwater tributary of the Cho-Shui River in Taiwan. Interpretation of landslide patterns from the early maps indicate that in four sub-basins (36 km(2)) structural geological factors control chronic landsliding regularly reactivated by intense rains. Within these four sub-basins, all later air photographs reveal a continuing high incidence of landslides (with landslide densities of 3 - 11 ha/km(2)). Air photographs taken in 1963, following extensive logging, in 1985, following highway construction, and in 1996, following the very large typhoon Herb event demonstrate the short-term effects of disturbance in these structurally weak sub-basins. Air photographs from 1980 and 1993 demonstrate recovery of the land surface from logging and highway construction impacts, respectively. For the adjacent sub-basins (56 km 2), two modes of response to perturbations were identified: six sub-basins (48 km(2)) showed direct response to logging, road construction and typhoon Herb and five sub-basins (8 km(2)) were more buffered and showed some lagged responses. Even this last category of sub-basins is more active than the average for Taiwan, where the mean landslide density is 0.84 ha/ km(2). It is proposed that, for the 92.1-km(2) Hoshe basin, the 'formative event' sensu Brunsden [Z. Geomorphol. Suppl. 79 (1990) 1] is one that produces approximately 200 ha of landslides, a value that has been equaled or exceeded in each of the periods of study (1963-1980, 1980-1985, 1985 - 1993 and 1993 - 1996). Logging activity, major road construction, and extreme typhoon and earthquake events produce short-term acceleration of landslide incidence. In principle, recovery rates of the land from pulsed perturbations of about 20 years for logging activity and about 8 years for major road construction may also be suggested.
机译：1904年和1915年的地图以及1963年，1980年，1985年，1993年和1996年的航空照片提供了记录，记录了台湾Cho-Shui河的上游支流92.1 km（2）的流域内的滑坡。对早期地图的滑坡模式的解释表明，在四个子流域（36 km（2））中，结构地质因素控制着经常被强降雨重新激活的慢性滑坡。在这四个子流域内，所有后来的航空照片都显示出滑坡的发生率持续较高（滑坡密度为3-11 ha / km（2））。 1963年，广泛采伐之后，1985年，高速公路建设之后以及1996年巨大的台风“赫伯”事件之后拍摄的航空照片显示了这些结构薄弱的子流域的短期扰动效应。 1980年和1993年的航空照片分别显示了伐木和公路建设造成的土地表面恢复。对于相邻的子流域（56 km 2），确定了两种对扰动的响应模式：六个子流域（48 km（2））显示了对伐木，道路建设和台风药草的直接响应，还有五个子流域（8 km（2））受到更多缓冲，并显示出一些滞后响应。即使是最后一个子流域也比台湾的平均水平更为活跃，台湾的平均滑坡密度为0.84 ha / km（2）。对于92.1 km（2）的Hoshe盆地，提出了“形成性事件” sensu Brunsden [Z.地吗啡。补充79（1990）1]是一种产生约200公顷滑坡的滑坡，在每个研究时期（1963-1980、1980-1985、1985-1993和1993-1996），该值均相等或超过。伐木活动，主要道路建设以及极端台风和地震事件会在短期内加速滑坡的发生。原则上，对于伐木活动，建议从脉冲扰动中恢复土地约20年，对于主要道路建设，应恢复约8年。

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