Dynamics of unusual debris flows on Martian sand dunes
Dynamics of unusual debris flows on Martian sand dunes
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火星沙丘上异常泥石流的动力学
DOI：
10.1029/2004gl020313
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发表时间：
2004
影响因子：
5.2
通讯作者：
M. Bourke
中科院分区：
文献类型：
--
作者：
H. Miyamoto;J. Dohm;V. Baker;R. Beyer;M. Bourke
在拉塞尔撞击坑中，切割沙丘的沟壑经常在其远端显示出类似泥石流的沉积物。使用宾汉塑性流动的数值模拟代码，以帮助解释这些功能的形成，估计流变性能和流量的可能范围。我们的模拟结果是最好的解释了快速泥石流。例如，具有102 Pa·s的粘度和102 Pa的屈服强度的泥石流可以形成观察到的沉积物，其流速为0.5 m3/s，持续数分钟，总排出水量约为数百立方米，这可能是通过将沙丘沉积物内的表面层间隙冰融化至数厘米深而产生的。
Gullies that dissect sand dunes in Russell impact crater often display debris flow‐like deposits in their distal reaches. The possible range of both the rheological properties and the flow rates are estimated using a numerical simulation code of a Bingham plastic flow to help explain the formation of these features. Our simulated results are best explained by a rapid debris flow. For example, a debris flow with the viscosity of 102 Pa s and the yield strength of 102 Pa can form the observed deposits with a flow rate of 0.5 m3/s sustained over several minutes and total discharged water volume on the order of hundreds of cubic meters, which may be produced by melting a surface layer of interstitial ice within the dune deposits to several centimeters depth.