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首页> 外文期刊>Zeitschrift fur Geomorphologie >Accelerated mass movement activities due to increased rainfall in the Nainital township, Kumaun Lesser Himalaya, India
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Accelerated mass movement activities due to increased rainfall in the Nainital township, Kumaun Lesser Himalaya, India

机译：由于核坐乡，Kumaun Lesser Himalaya，India的降雨量增加，群众运动活动加速

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Nainital township is known to be vulnerable to landslides and related mass movement activities since past and their record in the area dates back to as early as 1867. Previous studies estimate that about half the area of Nainital basin is covered with debris generated by landslides. GPR studies carried out in the area confirm that the thickness of the debris on the slope varies between 2 and 10 m. Geologically, the area constitute limestone, shale and slate belonging to Blaini, Krol and Tal formations of the Lesser Himalaya. These rocks are traversed by a major Nainital Lake Fault that runs all along the area in the NW-SE direction and the Hanumangarhi Fault that runs almost E-W. The off-shoots of these faults have also been many sections. The geotechnical properties of rocks and soils constituting the slope like poor rock mass conditions, negligible cohesion and moderate friction angle of the debris material also constitute a propensity towards its failure. It has further been observed that the area receive higher amount of rainfall particularly after 2009. There is an increase of about 73% annual precipitation as well as precipitation during monsoon season. This has caused the intensity of rainfall to have risen from 30 mm per day during 1995-2009 to 51 mm per day during 2010-2015. This increased rainfall intensity in the township has caused many slopes in the area to fail.
机译：众所周知，纳纳托乡镇以自过去及其在该地区的记录达到1867年以来的损失和相关的群众运动活动。之前的研究估计了纳纳托盆地面积约一半被山体滑坡产生的碎片覆盖。该地区进行的GPR研究证实，坡度上的碎片的厚度在2到10米之间变化。地质上，该地区构成石灰石，页岩和属于Blaini，Krol和较小Himalaya的TAL形成的石板。这些岩石是由一个主要的纳纳托湖故障遍历，沿着NW-SE方向的区域和运行几乎E-W的Hanumangarhi故障运行。这些断层的脱落也是很多部分。构成岩石质量条件差，碎屑材料的可忽略不计和中等摩擦角等岩石和土壤的岩土性特性也构成了对其失效的倾向。进一步观察到，该地区特别在2009年后收到较高的降雨量。在季风季节的降水量和降水量增加约73％。这导致2010 - 2015年1995 - 2009年每天30毫米的降雨强度从每天30毫米到51毫米。这座乡镇的降雨强度提高了该地区的许多斜坡失败。

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