Debris-flow fan development and geomorphic effects in alpine canyons under a changing climate
文献类型：期刊论文
| 作者 | Hou, Weipeng3; Yu, Guo-An |
| 刊名 | EARTH SURFACE PROCESSES AND LANDFORMS
 |
| 出版日期 | 2023-09-11 |
| 卷号 | N/A |
| 关键词 | alluvial fan alpine canyon area debris flow geomorphic effect Southeast Tibet |
| ISSN号 | 0197-9337 |
| DOI | 10.1002/esp.5699 |
| 产权排序 | 1 |
| 文献子类 | Article ; Early Access |
| 英文摘要 | Debris flows in alpine environments are prone to occur in the context of global climate change (i.e., elevated air temperature and higher frequency of strong precipitation events). (Alluvial) Fans often develop at the outlet of tributaries after high-intensity debris flows. Most debris-flow fans in alpine canyon areas extend directly to the main river channel and become the forefront of the interaction between the tributary gully and the main river channel. Clarifying the development processes/dynamics, evolutionary mechanisms and driving factors of alluvial fans would shed light on understanding the geomorphological effects and genesis of river valleys in alpine canyon areas. Here, we report the development of debris-flow fan at the outlet of the Tianmo Gully, a formerly hazard-free but currently hazard-active tributary of the Parlung Tsangpo Basin, Southeast Tibet, where debris flows have occurred frequently in the last two decades. Combining remote-sensing images, DEM data, UAV aerial photography, RTK topographic survey and other fieldwork, the development processes and morphological characteristics of the Tianmo fan under the influence of four large debris flows were analysed. Both primary events (described as episodic debris-flow events characterized by high-magnitude mass movement) and secondary events (corresponding to perennial stream flow processes with much lower sediment concentrations) affected the development of the Tianmo fan. Episodic debris-flow events drastically shape the macroscopic morphology of the fan, with rapid deposition and expansion of the fan body, whereas perennial stream flow processes slowly modulate the fan during the intermittent period between debris flows, mainly with gradual retrogressive incision and lateral migration of flow channel on the fan body. Influenced by the strong sediment-transport process of debris flows and the alluvial fan development, the planform of the Parlung Tsangpo River evolved from a relatively narrow and single-thread pattern to an alternating-wide-and-narrow pattern, with a corresponding staircase-like longitudinal profile. We investigated alluvial fan development and geomorphic effects of Tianmo Gully in Southeast Tibet, an alpine canyon area where debris flows have been active in recent decades under a changing climate. Debris flow is the key driver for the fan development, whereas runoff reworking is non-negligible, and strong interactions exist between the fan and the main river. Fan development exerts big impacts on the morphology evolution of the main river, forming an alternating-wide-and-narrow planform pattern with a staircase-like longitudinal profile.image |
| 学科主题 | Physical Geography ; Geology |
| WOS关键词 | ALLUVIAL FANS ; TIBETAN-PLATEAU ; PERMAFROST DEGRADATION ; GRAMPIAN HIGHLANDS ; RIVER INCISION ; EVOLUTION ; VALLEY ; SLOPE ; ALPS ; CATCHMENT |
| WOS研究方向 | Physical Geography ; Geology |
| WOS记录号 | WOS:001062007400001 |
| 出版者 | WILEY |
| 源URL | [http://ir.igsnrr.ac.cn/handle/311030/197864]  |
| 专题 | 陆地水循环及地表过程院重点实验室_外文论文 |
| 作者单位 | 1.Chinese Acad Sci, Inst Geog Sci & Nat Resources Res, 11A Datun Rd, Beijing 100101, Peoples R China 2.Univ Chinese Acad Sci, Coll Resources & Environm, Beijing, Peoples R China 3.Chinese Acad Sci, Key Lab Water Cycle & Related Land Surface Proc, Inst Geog Sci & Nat Resources Res, Beijing, Peoples R China |
| 推荐引用方式 GB/T 7714 | Hou, Weipeng,Yu, Guo-An. Debris-flow fan development and geomorphic effects in alpine canyons under a changing climate[J]. EARTH SURFACE PROCESSES AND LANDFORMS,2023,N/A. |
| APA | Hou, Weipeng,&Yu, Guo-An.(2023).Debris-flow fan development and geomorphic effects in alpine canyons under a changing climate.EARTH SURFACE PROCESSES AND LANDFORMS,N/A. |
| MLA | Hou, Weipeng,et al."Debris-flow fan development and geomorphic effects in alpine canyons under a changing climate".EARTH SURFACE PROCESSES AND LANDFORMS N/A(2023). |
入库方式： OAI收割
来源：地理科学与资源研究所
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