...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Earth Surface Processes and Landforms: The journal of the British Geomorphological Research Group >Flow hydraulics and geomorphic effects of glacial-lake outburst floods in the mount everest region, nepal
【24h】

Flow hydraulics and geomorphic effects of glacial-lake outburst floods in the mount everest region, nepal

机译：尼泊尔珠穆朗玛峰地区冰川湖暴发洪水的水力水力和地貌影响

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

Glacial-lake outburst floods (GLOFs) on 3 September 1977 and 4 August 1985 dramatically modified channels and valleys in the Mount Everest region of Nepal by eroding, transporting, and depositing large quantities of sediment for tens of kilometres along the flood routes. The GLOF discharges were 7 to 60 times greater than normal floods derived from snowmelt runoff, glacier meltwater, and monsoonal precipitation (referred to as seasonal high flow floods, SHFFs). Specific stream power values ranged from as low as 1900 W m~(-2) in wide, low-gradient valley segments to as high as 51 700 W m~(-2) in narrow, high-gradient valley segments bounded by bedrock. Along the upper 16 km of the GLOF routes the reach-averaged specific stream power of the GLOFs was 3.2 to 8.0 times greater than the reach-averaged specific stream power the SHFFs. The greatest geomorphic change occurred along the upper 10 to 16 km of the GLOF routes, where the ratio between the GLOF specific stream power and the SHFF specific stream power was the greatest, there was an abundant supply of sediment, and channel/valley boundaries consisted primarily of unconsolidated sediment. Below 11 to 16 km from the source area, the geomorphic effects of the GLOFs were reduced because of the lower specific stream power ratio between the GLOFs and SHFFs, more resistant bedrock flow boundaries, reduced sediment supply, and the occurrence of past GLOFs.
机译：1977年9月3日和1985年8月4日的冰川湖爆发洪水（GLOF）通过侵蚀，运输和沿洪水路线沉积数十公里的大量沉积物，大大改变了尼泊尔珠穆朗玛峰地区的河道和山谷。 GLOF的排放量比融雪径流，冰川融水和季风降水（称为季节性高流量洪水，SHFF）引起的正常洪水要大7至60倍。在宽的低梯度谷段中，比流功率值范围从低至1900 W m〜（-2），到以基岩为界的狭窄，高梯度谷段中，比流功率值高达51 700 W m〜（-2）。沿着GLOF路线的上16公里，GLOF的平均到达比流功率是SHFF的平均到达比流功率的3.2到8.0倍。最大的地貌变化发生在GLOF路线的上10至16 km处，其中GLOF比流功率与SHFF比流功率之比最大，沉积物供应丰富，且通道/谷边界由主要是未固结的沉积物。在距源区不到11至16 km的地方，由于GLOF和SHFF之间的比流功率比较低，基岩流边界更具抵抗性，沉积物供应减少以及过去GLOF的发生，GLOF的地貌效应得以降低。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号