Ancient Channel Network of the Keltma Hollow (Kama-Vychegda Watershed)

N. Nazarov
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Abstract

The bottom relief of the Keltma hollow (ancient river valley), which connects the modern basins of the Vychegda River and Kama River, was studied. For this purpose, traces of the Late Pleistocene overflow of water from the dammed glacial lake of the Vychegda River depression into the Kama River basin were analyzed using the factual materials on the southern (Kama) territory of the Keltma hollow. The ongoing discussion about the timing of this event fuels the interest in this problem: some paleogeographers believe that the last overflow took place at the beginning of the Late Pleistocene (Kalin time), while others date it to the end of the Late Pleistocene (Ostashkov time). Historically, supporters of both these versions investigated the bottom of the dammed lake (Vychegda River basin). With the help of the satellite images, the Vychegda depression deposits were analyzed and dated. The remote sensing of the Earth’s surface within the raised bogs and the alluvial-lake terrace showed traces of the ancient channel forms, occasionally not related to the Pre-Holocene rivers. Some of the ancient channel forms are traces of the overflow of water across the watershed rapids. Acknowledgments .
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凯尔特玛山谷古水道网(卡马-维切格达流域)
研究了连接维切格达河和卡马河现代盆地的凯尔特玛山谷(古河谷)底部地形。为此,利用Keltma凹陷南部(Kama)地区的实际资料,分析了晚更新世Vychegda河洼地淤积冰湖溢流到Kama河流域的痕迹。关于这一事件发生时间的持续讨论激发了人们对这一问题的兴趣:一些古地理学家认为,最后一次溢流发生在晚更新世初期(卡林时间),而另一些人认为它发生在晚更新世末期(奥斯塔什科夫时间)。从历史上看,这两种说法的支持者都调查了堰塞湖(维切格达河流域)的底部。在卫星图像的帮助下,对维切格达凹陷沉积物进行了分析和定年。对地表隆起的沼泽和冲积湖阶地的遥感显示了古代河道形式的痕迹,偶尔与全新世以前的河流无关。一些古老的河道形式是水在流域急流中溢出的痕迹。致谢
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0.70
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审稿时长
17 weeks
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