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冰川泥石流的形成与发生判别分析-以西藏东南部为例
陈瑞
Thesis Advisor罗德富 ; 李椷
1991
Degree Grantor中国科学院研究生院
Place of Conferral北京
Degree Name硕士
Degree Discipline自然地理
Keyword冰川泥石流 形成条件 机成机理 判别分析
Abstract冰川泥石流是发生在高山冰缘地区的一种常见的特殊洪流现象,是泥石流研究所涉及到的主要类型之一。它是由极其丰富的松散固体物质(新老冰碛物)、陡峻的地形基础和与冰雪有关的水体共同作用所决定的,并以独特水源激发条件而有别其它类型的泥石流根据野外考察所获得的资料,以地质地貌学、冰川水文学、气象学等学科观点为基础,本文着重从冰川泥石流形成条件和发生原因两个方面进行论述,并且在土力学基础上探讨其形成机理和模式。同时,尝试用多元统计方法对冰川泥石流进行判别分析,并获得了令人满意的结果。通过分析和论证,主要得出以下几点结论:(1)冰川泥石流形成依赖于现代冰川的活动以及相应的地质地貌、水文气象、地震和人为因素,是冰退时期的产物。(2)冰川泥石流的形成与10-4月高山区降水量多少和发生前月,日气温高低有关。一般是正相关关系。(3)冰川泥石流按其水动力条件可划分三种类型:第一,冰崩雪崩融水型;第二,冰川积雪融水型(含降雨);第三,冰湖溃决型。(4)大型冰川泥石流的形成往往是由于流通段沟槽中局部地段阻塞或暂时性阻塞后,再经溃决所导致。(5)冰川泥石流形成机理可划分为12类,归属于土力类和水力类。(6)按照土本起动的力学机制和发生位置以及水的作用特点,冰川泥石流发生存在着三种模式即斜坡发生模式,沟床发生模式,容水体破损发生模式。(7)用多元统计方法来定量地判别出某一沟谷是否会发生泥石流,其方法是可行的。在藏东南地区建立的模型是:y = 0.045x_1 - 0.0247x_2 - 0.0102x_3 - 0.0267x_4 - 0.0097x_5 + 0.3539x_6 + 0.001x_7 - 0.0013x_8 + 0.0014x_9临界值:y_(ab)=5.90当y≤y_(AB)泥石流发生当y>y_(AB)泥石流未发生
Other AbstractGlacier debris flow is a special kind of torrent which takes place in the extent of the glaeier edges in high mountains, and it is one of chief types what debris flow is studies. Because there are not only a plenty of the loose solid material (till) and the steep topograph conditions but also water body with ice and snow regarded as excitation condition, its occurence and formation is disting-wished from other kinds. Based on the field inestigation and the view points on geology, geomorphology, glaciohydrology and meteorology, etc., the paper give the more minute and complete discuss to the forming conditions and reasons of the glacier debris flow. And based on soil mechanics, author study the forming mechanism and model of the glaeier debris flow. Simutaneously, auther also try to differentiate whether glaeier debris flow can be taken place or not by the multifactor analysis means and the result is satisfactory. By analysing and discussing in the paper, the several conclusions as follow can be get: (1) Formation of glacier debris flow depend on mordern glacier activity and other factors which are related to geology and geomorphology, hydrology and meteordogy, earthquake and man's activities. This is considered as the outcome in the period of glacier to shrink. (2) Formation of glacier debris flow in the southeast of Tibet is closely related to the precipitation between winter and spring in high mountains and the average temperature of mouth and day when debris flow take place, and there are the positive interration between them. (3) Glacier debris flow can be devided into three claosifications by the conditions of water driving force, i.e. ice and snow facl thawing type, ice and snow thawing type and ice lake out-burst type. (4) Formation of large scale glacier debris flow generally result from the blocks at some places in the running area in gully to burst. (5) The forming mechanism of glacier debris flow can be classified into twelve sorts, belonging to the water power type and the soil power type. (6) According to the combination among soil mechamics, position factors and water function, three kinds of the occurence models can be obtained: slop occuring model gully bed occuring model reservior bursting model (7) It i feasible to differentiate quantitatively whether glacier debris flow occur or not by the multifactor analysis method. In the sowtheast of Tibet, author forms formula of discriminant function: y = 0.045x_1 - 0.0247x_2 - 0.0102x_3 - 0.0267x_4 - 0.0097x_5 + 0.3539x_6 + 0.001x_7 - 0.0013x_8 + 0.0014x_9 the comprehensive discriminate index: y_(ab)=5.90 when y≤y_(AB)glacier debris flow occur when y>y_(AB) glacier debris flow do not occur
Document Type学位论文
Identifierhttp://ir.imde.ac.cn/handle/131551/6879
Collection成都山地所知识仓储(2009年以前)
Recommended Citation
GB/T 7714
陈瑞. 冰川泥石流的形成与发生判别分析-以西藏东南部为例[D]. 北京. 中国科学院研究生院,1991.
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