Longitudinal development of clast shape characteristics from different material sources in Hrbye River, Central Svalbard

IF 0.5 Q4 ECOLOGY

Czech Polar Reports Pub Date : 2020-07-01 DOI:10.5817/CPR2020-2-15

Lenka Ondráčková

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引用次数: 0

Abstract

The sediment transport in polar regions is highly changeable and it is getting faster in connection with a climate change. This study describes the Hrbye River catchment located in the northern Billefjorden, Central Svalbard. The Czech Arctic Station and AMUPS - Adam Mickiewicz University Polish Polar Station are located in near this locality Petunia Bay. The material for this study was sampled in August 2016, during the summer research campaign of Czech Arctic Station together with a cooperation between Masaryk University in Brno and the University of Oslo via Norway Grants. The catchment area is 60 km 2 . The area of interest lies around the 10 km long Hrbye River in its braidplain, which is 2.3 km wide and 4.5 km long. In the Hrbye Glacier forefield, 27 sediment sampling localities were selected and defined into seven groups: (i) esker complex; (ii) debris stripes; (iii) till plain; (iv) hummocky moraine; (v) post-LIA braidplain; (vi) LIA moraine; (vii) LIA braidplain. Three main petrological types of rocks were studied (SVP – sandstone, VAP – limestone, ORT – orthogneiss). Lithology and roundness of the clasts were evaluated in order to study clast shape properties from various glacial sediments. The results show the dominant role of lithology on the clast shape modification in the Hrbye Glacier forefield.

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中斯瓦尔巴群岛Hrbye河不同物质来源碎屑形态特征的纵向发展

极地的沉积物输送是高度可变的，而且随着气候变化，其速度越来越快。本研究描述了位于斯瓦尔巴群岛中部比尔峡湾北部的赫比河流域。捷克北极站和AMUPS-Adam Mickiewicz大学波兰极地站位于佩尼亚湾附近。这项研究的材料是在2016年8月捷克北极站夏季研究活动期间以及布尔诺Masaryk大学和奥斯陆大学通过挪威拨款合作期间采样的。集水区面积60平方公里。感兴趣的区域位于辫状平原中10公里长的Hrbye河周围，该河宽2.3公里，长4.5公里。在赫比冰川前场，选择了27个沉积物采样点，并将其分为七组：（i）埃斯克复合体；（ii）碎屑条纹；（iii）直至平原；（iv）丘状冰碛；（v） LIA后编织；（vi）LIA冰碛；（vii）LIA编织。研究了三种主要的岩石类型（SVP–砂岩、VAP–石灰岩、ORT–正片麻岩）。为了研究不同冰川沉积物中碎屑的形状特征，对碎屑的岩性和圆度进行了评估。结果表明，岩性对赫比冰川前场碎屑形态的改变起主导作用。

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来源期刊

Czech Polar Reports Agricultural and Biological Sciences-Agricultural and Biological Sciences (all)

CiteScore

1.30

自引率

10.00%

发文量

期刊介绍： Czech Polar Reports is an international, multidisciplinary, peer-reviewed journal. It is issued 2 times a year. The journal is dedicated to provide original research papers for sciences related to the polar regions and other planets with polar analogues. Czech Polar Reports covers the disciplines listed below. polar paleontology, geology, geochemistry, geomorphology, glaciology, climatology, hydrology, pedology, biochemistry, ecology, environmental science, microbiology, plant and animal biology including marine biology.