Alluvial fans of Trans-Himalayan cold desert (Pin valley, India): quantitative morphology and controlling factors

IF 1.1 4区地球科学 Q4 ENVIRONMENTAL SCIENCES

Physical Geography Pub Date : 2021-03-31 DOI:10.1080/02723646.2021.1907883

Amit Shoshta, B. S. Marh

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引用次数: 0

Abstract

ABSTRACT Pin valley is an ideal area for alluvial fans’ development. Being least disturbed and devoid of vegetation, fans of this area provide exquisite information and extraordinary opportunity to understand different factors that affect their morphology. Despite aforesaid advantages these fans are hitherto not studied. Thus, the present study is an attempt to understand the morphology of these fans and explore factors affecting fan morphology, primarily through morphometry. Data were derived from various satellite imageries, topographical sheets, DEM and field observations. Various parameters of 51 fans and of their basins were measured and relationships among different parameters were examined. The results of the study are generally comparable to literature though these fans are much steeper than their counterparts in similar environmental settings. Multi-proxy approach was used to explore controlling factors. Fan Conicality Index (FCI) and sweep angle of fan (SA ) suggest confinement imposed by surrounding environment has considerably reduced the size of these fans. Further, valley-floor width to height ratio (Vf ), feeder channel and geological group-wise analyses reveal that active tectonic attitude, order of feeder channel, lithology and characteristics of contributing basin along with associated depositional processes exercise significant control on morphology of these fans.

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跨喜马拉雅寒冷沙漠冲积扇（印度平谷）：数量形态和控制因素

品谷是冲积扇发育的理想地带。该地区植被稀少，受干扰最小，为了解影响其形态的不同因素提供了丰富的信息和绝佳的机会。尽管有上述优点，但迄今为止尚未对这些风扇进行研究。因此，本研究主要通过形态计量学来了解这些扇的形态，并探索影响扇形态的因素。数据来源于各种卫星图像、地形图、DEM和实地观测。测量了51个扇体及其盆体的各种参数，并检验了不同参数之间的关系。这项研究的结果通常与文献相当，尽管这些风扇比类似环境中的风扇陡峭得多。采用多代理方法探讨控制因素。风机锥度指数（FCI）和风机扫掠角（SA）表明，周围环境的限制大大减小了这些风机的尺寸。此外，谷底宽高比（Vf）、补给通道和地质分组分析表明，活跃的构造姿态、补给通道的顺序、贡献盆地的岩性和特征以及相关的沉积过程对这些扇的形态具有重要的控制作用。

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来源期刊

Physical Geography 地学-地球科学综合

CiteScore

3.60

自引率

0.00%

发文量

审稿时长

6 months

期刊介绍： Physical Geography disseminates significant research in the environmental sciences, including research that integrates environmental processes and human activities. It publishes original papers devoted to research in climatology, geomorphology, hydrology, biogeography, soil science, human-environment interactions, and research methods in physical geography, and welcomes original contributions on topics at the intersection of two or more of these categories.