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首页> 外文期刊>Earth and Planetary Science Letters: A Letter Journal Devoted to the Development in Time of the Earth and Planetary System >Did Martian valley networks substantially modify the landscape?
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Did Martian valley networks substantially modify the landscape?

机译：Martian Valley网络是否大大修改了景观？

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摘要

Valley networks are ancient drainage systems incised on the southern hemisphere of Mars, and stand as evidence that liquid water once sculpted its surface. The duration of valley network activity and the sources of water are key questions in deciphering the timing of water stability on early Mars, but remain poorly constrained. In this study we address two questions: Did Martian valley networks evolve for sufficiently long to establish their own erosional basins, or do their profiles primarily reflect landscape pre-incision topography? And were these valleys precipitation-fed or spring-fed? Our analysis uses the theoretical framework built to describe the shape of steady-state river profiles on Earth to compare and analyze the concavity of 62 valley network longitudinal profiles on Mars. Using non-linear fits to valley profiles we evaluate the degree to which valley networks are consistent with fluvial steady-state. The fit enables the identification of valley network concavity index and area-discharge exponent, which we then interpret in terms of the theoretical framework to discuss valley network maturity and water source. Our results show that the majority of valley networks do not have concave or even smooth profiles, and did not substantially modify their surrounding landscape. We observe disparity in concavity indexes of valley networks belonging in the same integrated basins, indicating different stages of landscape evolution and lack of synchronous valley development. However, our results identify six valley networks consistent with fluvial steady-state and areally uniform precipitation. (C) 2020 Elsevier B.V. All rights reserved.
机译：山谷网络是火星南半球的古代排水系统，并作为液体水曾经雕刻的表现出来的证据。谷网络活动的持续时间和水源是破译火星早期水稳定时间的关键问题，但仍然受到严重受损。在这项研究中，我们解决了两个问题：Martian Valley网络是否足够长时间发展，以建立自己的侵蚀盆地，或者他们的档案主要反映景观预切口地形？这些山谷沉淀或春季喂养？我们的分析采用了构建的理论框架来描述地球上稳态河流型材的形状，比较和分析火星上62个谷网络纵向概况的凹面。使用非线性适合谷型材，我们评估谷网络与河流稳态一致的程度。该符合旨在识别谷网络凹面指数和区域放电指数，然后我们在理论框架方面解释讨论谷网络成熟度和水源。我们的研究结果表明，大多数山谷网络没有凹形甚至是平滑的配置文件，并没有大幅修改周围的景观。我们观察属于同一综合盆地的谷网络的凹陷指标，表明景观演化的不同阶段和缺乏同步谷开发。但是，我们的结果确定了六个谷网络，与氟稳态一致，降水量均匀。 （c）2020 Elsevier B.v.保留所有权利。

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