Coupling fluvial processes and landslide distribution toward geomorphological hazard assessment: a case study in a transient landscape in Japan
Coupling fluvial processes and landslide distribution toward geomorphological hazard assessment: a case study in a transient landscape in Japan
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DOI：
10.1007/s10346-017-0838-3
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发表时间：
2017-05
期刊：
影响因子：
6.7
通讯作者：
C. Tsou;M. Chigira;Y. Matsushi;N. Hiraishi;N. Arai
中科院分区：
文献类型：
--
作者：
C. Tsou;M. Chigira;Y. Matsushi;N. Hiraishi;N. Arai
本研究量化了基岩滑坡多发地区日本纪宜山熊野河上游深层重力斜坡变形（DGSDs）、滑坡和河流回潮之间的关系。研究人员检查了河流剖面和山坡地貌，并使用高分辨率数字高程模型（dem）来识别dgsd和滑坡。许多深层滑坡与1889年和2011年的暴雨有关。根据2011年降雨期间发生的52个深层滑坡的滑坡量与滑坡区域的关系，为景观剥蚀和产沙提供了基础数据。河道恢复是逐步进行的，切割出中起伏古地表，形成了两组裂口和深达400 m的v型内峡谷。65%以上的滑坡和75%以上的滑坡与古地表边缘的内峡谷有关联，或完全被内峡谷所包围。与河谷内坡的切割相关的dgsd和滑坡往往比古地表内发育的更大，可能是河流切割的长期瞬态山坡响应。河道回切引起的边坡下切对边坡的长期稳定和体块运动分布具有重要作用，可作为滑坡危险性的指标。
This study quantified the relationship among deep-seated gravitational slope deformations (DGSDs), landslides, and river rejuvenation in the upper reaches of the Kumano River in the Kii Mountains of Japan, an area of frequent bedrock landslides. River profiles and hillslope landforms were examined, and high-resolution digital elevation models (DEMs) were used to identify DGSDs and landslides. Many of the deep-seated landslides were associated with rainstorms in 1889 and 2011. Landslide volumes were related to landslide areas on the basis of 52 deep-seated landslides that failed during the 2011 rainfall, providing basic data for landscape denudation and sediment yield. River rejuvenation occurred stepwise, incising moderate relief paleosurfaces and forming two series of knickpoints and V-shaped inner gorges that are up to 400-m deep. More than 65% of DGSDs and 75% of the landslides were located in association with the incised inner gorges along the peripheries of the paleosurfaces or were entirely contained within the inner gorges. DGSDs and landslides associated with the incised inner valley slopes tended to be larger than those developed within the paleosurfaces and may be long-term transient hillslope responses to river incision. Hillslope undercutting caused by rejuvenated river incision may play an important role in long-term slope stability and distribution of mass movements, and could serve as an indicator of landslide hazard.