Numerical computations of a theoretical model of ribbed moraine formation

Numerical computations of a theoretical model of ribbed moraine formation
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肋状冰碛形成理论模型的数值计算

DOI:
10.1002/esp.2138
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发表时间:
2011
影响因子:
3.3
通讯作者:
Chapwanya M
Chapwanya M
中科院分区:
地球科学2区
文献类型:
--
作者:
Chapwanya M

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我们开发了一个理论模型的数值解,该模型被用来解释冰下河床的形成。该模型已被证明有能力产生二维的床状,当它们可以被解释为肋状冰碛时。然而,这些研究没有回答这个问题,即该理论是否能够产生完全三维的结构,如鼓状结构。我们表明,虽然三维计算显示出真实的准三维特征,如肋纹中的位错,但它们并不能产生真正的三维鼓面。我们认为,这种不足是由于理论将冰下排水作为被动变量处理,因此三维形式可能与足够的冰下水通量的条件有关。版权所有©2011 John Wiley & Sons, Ltd
We develop numerical solutions of a theoretical model which has been proposed to explain the formation of subglacial bedforms. The model has been shown to have the capability of producing bedforms in two dimensions, when they may be interpreted as ribbed moraine. However, these investigations have left unanswered the question of whether the theory is capable of producing fully three‐dimensional bedforms such as drumlins. We show that, while the three‐dimensional calculations show realistic quasi‐three‐dimensional features such as dislocations in the ribbing pattern, they do not produce genuine three‐dimensional drumlins. We suggest that this inadequacy is due to the treatment of subglacial drainage in the theory as a passive variable, and thus that the three‐dimensional forms may be associated with conditions of sufficient subglacial water flux. Copyright © 2011 John Wiley & Sons, Ltd.
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