Analysis on Causes of Debris Flow in Zangbuqu River in the Upper Reaches of Yalongzangbu River

Deng Xiaofeng

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Analysis on Causes of Debris Flow in Zangbuqu River in the Upper Reaches of Yalongzangbu River

- Analysis on Causes of Debris Flow in Zangbuqu River in the Upper Reaches of Yalongzangbu River
- Bulletin of Soiland Water Conservation Vol. 16, Issue 3, Pages: 27-30(1997)
- 作者机构：
  
  中国科学院兰州冰川冻土研究所,兰州市,730000
- 作者简介：
- 基金信息：
- DOI：
  CLC：
- Published：1997
- 稿件说明：
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Deng Xiaofeng. Analysis on Causes of Debris Flow in Zangbuqu River in the Upper Reaches of Yalongzangbu River[J]. Bulletin of Soiland Water Conservation, 1997, 16(3): 27-30.
DOI：

Deng Xiaofeng. Analysis on Causes of Debris Flow in Zangbuqu River in the Upper Reaches of Yalongzangbu River[J]. Bulletin of Soiland Water Conservation, 1997, 16(3): 27-30. DOI：

摘要

该区位于青藏高原南缘地带，为构造活动强烈、山地上升和河流下切速率较快的地区，流域相对高差在400～1500m左右，主谷比降在2°～35°，为泥石流的形成提供了有利的地形条件；历次强烈的构造运动，第四纪冰川，冰缘及地表风化作用，形成有多种类型的大量松散沉积物，提供了泥石流产生和发展的物质基础；泥石流爆发高峰期7～8月的降水量占年降水量的60%左右。在时段降水分布中，10min降水量，在羊八井为6.2mm

拉萨为7.6mm

10min降水量可占30min降水量的72%～81%

显示了高山带降水强度较大的特点。即该区降水雨强度十分有利于泥石流形成和活动

Abstract

The studied area is located in the south marginal belt of the Qingzang Plateau where the tectonic movement is exctensive

the mountain uplifting and river undercutting region are quickly

inner the basin

the g radient of gullies are always 22～35°

the relative difference of height is 400～1 500m

these landscape conditons are advantageous to the formation of debris flow；nearly every extensive tectonic movenent

the quarternary glaciation

subglaciation and surfacial weathering generated many kinds of loose deposits and formed the solid material foundation for formation and development of debris flow；the annual precipitation is about 450mm

among which the rainfall during summer occupies nearly 90 percent

the rainfall during frequently ocurring period of debris flow in July and Augest occupied 60 percent of the annual precipitation

the 10 minutes rainfall intensity is 6. 2mm and 7. 6mm in Yang bajing and Lahsa respectively.The rainfall in studied area has the high intensity features of mountain area

in another word

the regional rainfall is quite favourable to formation and activity of debris flow.

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