Spatial organization of drumlins
Spatial organization of drumlins
复制标题
鼓林的空间组织
DOI：
10.1002/esp.4192
复制
发表时间：
2017
影响因子：
3.3
通讯作者：
Clark C
中科院分区：
文献类型：
--
作者：
Clark C
流过软沉积物的冰盖会在河床上产生起伏，通常有数米的起伏，其中鼓状起伏最为丰富，研究也最为广泛。关于其形成机制尚未达成共识。在本文中，我们研究了鼓林的空间组织，以便提供对这种现象的改进描述并指导其形成的假设。我们回顾了强调关于鼓鼓空间组织的矛盾发现的文献，然后利用它来激发我们基于来自加拿大、英国和挪威的鼓鼓的大样本（42 488）的研究。鼓鼓定位是否有典型的排列，它们是以规则的空间方式组织（图案化）还是随机分布？我们认识到鼓林场本质上是不均匀的，因此应用不均匀的空间统计来研究它们的分布。这表明虽然鼓膜偶尔是随机放置的，但它们的主要状态是非随机的。它们在 100 至 1200 米的长度范围内表现出强烈且具有统计显着性的规律性信号。我们得出的结论是，图案是鼓林几乎无处不在的特性。这一规律性的发现证明了成床过程中的空间自组织，鼓林是冰下沉积物流动性的一种新兴表现。鼓鼓之间的公里级相互作用必须在它们进化时发生，或者相互作用可能由于生长或迁移而出现。需要假设或模型来解释鼓膜的规则间距。我们强调了这种自组织的三个建议：冰流-沉积物通量-床形状耦合的不稳定性；沉积物流动性和地形起伏之间的局部反馈；以及通过生长或迁移而粗化。 © 2017 作者。地球表面过程和地貌由 John Wiley & Sons Ltd 出版。
Ice‐sheets flowing over soft sediments produce undulations in the bed, typically of metres in relief, of which drumlins are the most abundant and widely investigated. Consensus regarding their mechanism of formation has yet to be achieved. In this paper we examine the spatial organization of drumlins in order to provide an improved description of the phenomenon and to guide hypotheses of their formation. We review the literature highlighting contradictory findings regarding drumlin spatial organization and then use this to motivate our study based on a large sample (42 488) of drumlins from Canada, Britain and Norway. Are there typical arrangements in drumlin positioning and are they organized in a regular spatial manner (patterned) or are they distributed randomly? We recognize that drumlin fields are inherently patchy and therefore apply inhomogeneous spatial statistics in order to study their distribution. This shows that whilst drumlins are occasionally randomly placed, their main state is non‐ random. They exhibit a strong and statistically significant signal of regularity across lengths scales of 100 to 1200 m. We conclude that patterning is a near ubiquitous property of drumlins. This finding of regularity demonstrates spatial self‐organization in the bedforming process with drumlins as an emergent manifestation of sub‐glacial sediment mobility. Kilometre‐scale interactions between drumlins must occur as they evolve, or interactions may arise as a consequence of growth or migration. Hypotheses or models are required that can explain the regular spacing of drumlins. We highlight three suggestions for such self‐organization: instability in the coupling of ice flow–sediment flux–bed shape; local feedback between sediment mobility and relief; and coarsening by growth or migration. © 2017 The Authors. Earth Surface Processes and Landforms published by John Wiley & Sons Ltd.
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DOI：
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发表时间：
1997
期刊：
影响因子：
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作者：
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DOI：
--
发表时间：
2002
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影响因子：
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作者：
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通讯作者：
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影响因子：
3.4
作者：
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影响因子：
2.3
作者：
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