| 题名 | 藏东南冰湖溃决泥石流形成机制 |
| 作者 | 党超 |
| 学位类别 | 博士 |
| 答辩日期 | 2009 |
| 授予单位 | 中国科学院水利部成都山地灾害与环境研究所 |
| 授予地点 | 成都 |
| 导师 | 崔鹏 ; 程尊兰 |
| 关键词 | 藏东南 冰湖溃决 泥石流 试验 形成条件 特征数 运动模型 |
| 其他题名 | The Mechanics of Debris Flows Resulting From Glacier Lake Outburst Floods in Southeast Tibet |
| 学位专业 | 自然地理学 |
| 中文摘要 | 论文主要野外调查与室内试验的方法，对冰湖溃决泥石流的形成和运动过程进行了分析。藏东南部的帕隆藏布培龙-然乌段冰湖以冰碛湖为主，占68.7%；冰湖面积普遍较小，主要分布在海拔4500-5000m之间。近20a以来，该地区冰湖面积增加幅度很小；冰湖溃决洪水能否演化为泥石流主要取决于洪水的携沙力是否满足泥石流的底限容重，其形成的临界条件Kc>2.66时为泥石流，反之为挟沙水流；通过试验对冰湖溃决泥石流的各特征参数主要影响因素进行了分析，并通过量纲分析和回归分析得出了冰湖溃决泥石流各峰值参数的计算公式；冰湖溃决泥石流为非饱和泥石流，泥石流固体颗粒存在垂向浓度分布随着冰湖溃决洪水的向下游演进，冰湖溃决泥石流可以形成多处龙头，泥石流龙头最大高度与溃决水深有关。 |
| 英文摘要 | The formative and motional processes of debris flows aroused by glacier lake outburst floods (GLOFs) were discussed by terms of field investigation and indoor experiments herein. The glacier lakes along Peilong-Ranwu of Pumlongzangbu in Southeast Tibet were relatively small, and dominated by moraine lakes, accounting for 68.7% of the tatol, and mainly located between the elevations of 4500m to 5000m. The acreage of glacier lakes in this region appreciably increased during the past 20a. The process of the evolution of GOLFs to debris flow depended on whether the bulk concentration of bedload equaled to minimum one of debris flow, the water-sendiment two phase flows were debris flow when Kc>2.66, and sendiment laden flow otherwise. The analysis of influencial matters to characteristic parameters of debris flow aroused by GLOFs had been conducted by terms of experiments, and calculative methods of which had been given according to dementional analysis and regression herein. The debris flows resulting from GLOFs were non-saturated ones. The debris flow resulting from GLOFs could form surges along with the GLOFs routing, and the height of which positively related to the depth of debris flow. |
| 语种 | 中文 |
| 公开日期 | 2010-10-13 |
| 分类号 | P64;P53 |
| 内容类型 | 学位论文 |
| 源URL | [http://ir.imde.ac.cn/handle/131551/2178]  |
| 专题 | 成都山地灾害与环境研究所_成都山地所知识仓储（2009年以前） |
| 推荐引用方式 GB/T 7714 | 党超. 藏东南冰湖溃决泥石流形成机制[D]. 成都. 中国科学院水利部成都山地灾害与环境研究所. 2009. |
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