Origin of longitudinal grooving in Tiu VallisMars: Isolation of responsible fluid‐types
Origin of longitudinal grooving in Tiu VallisMars: Isolation of responsible fluid‐types
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Tiu VallisMars 中纵向凹槽的起源：负责流体类型的分离
DOI：
10.1029/gl006i009p00735
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发表时间：
1979
期刊：
影响因子：
--
通讯作者：
D. Thompson
中科院分区：
文献类型：
--
作者：
D. Thompson
流体不稳定性分析已经发展为在指数分层粘度的流体的基础上施加的大的纵向滚柱涡扰动的增长或衰减。分析是绑在火星Tiu谷的汇合流区域中观察到的纵向开槽和凹槽的起源。分析测试各种类型的流体（水，泥石流/泥石流，熔岩，冰川）的倾向，由其有效粘度曲线定义，以发展纵向滚动模式作为其流场的一部分。允许这些图案以适合火星特征的尺度生长的流体有可能创造出所观察到的特征。分析的细节没有在这里介绍;相反，物理描述所使用的假设和施加的边界条件进行了讨论，并提出了结果，因为它们属于Tiu Vallis。据发现，在Tiu Vallis的凹槽图案可能已形成的涡流运动在泥流或碎屑载货泥浆，但泥沙/碎屑浓度或泥沙输运机制的精确表示是不可能的。结果表明，分析中模拟的纵向涡流运动类型可以在水、熔岩或冰中发展，但这些模型的具体流动特性（深度或速度）（包括涡流运动）在Tiu Vallis的流动中是不合理的。«少
Fluid instability analysis has been developed for the growth or decay of large, longitudinal roller vortex perturbations imposed at the base of fluids of exponentially stratified viscosities. The analysis is tied to the origin of longitudinal grooving and fluting observed in a region of converging flow in Tiu Vallis, Mars. The analysis tests the propensity of various types of fluids (water, mudflow/debris flow, lava, glacier), defined by their effective viscosity profiles, to develop longitudinal roll patterns as part of their flow field. Fluids which allow growth of these patterns at the scale appropriate to the Mars features have the potential of creating the observed features. The details of the analysis are not presented here; rather, physical description of assumptions used and boundary conditions imposed are discussed, and the results are presented as they pertain to Tiu Vallis. It is found that the grooving pattern in Tiu Vallis has probably been formed by vortex motion in a mudflow or debris-laden slurry, but exact representation of sediment/debris concentration or sediment transport mechanism is not yet possible. The results show that longitudinal vortex motion of the type modelled in the analysis can develop in water, lava, or ice, but that the specific flowmore » characteristics (depth or velocity) of these models which include the vortex motion are physically unreasonable for flow in Tiu Vallis.« less