Hydraulic modeling of a distributary channel of Athabasca Valles, Mars, using a high-resolution digital terrain model
Hydraulic modeling of a distributary channel of Athabasca Valles, Mars, using a high-resolution digital terrain model
复制标题
使用高分辨率数字地形模型对火星阿萨巴斯卡山谷分流河道进行水力建模
DOI：
10.1029/2011je003939
复制
发表时间：
2012
影响因子：
--
通讯作者：
J. Muller
中科院分区：
文献类型：
--
作者：
N. McIntyre;N. Warner;Sanjeev Gupta;Jungrack Kim;J. Muller
[1]估计流出通道中的流量大小对于发展对火星古水文学的理解具有核心作用。流量估计的典型方法是识别地貌特征，这些地貌特征指示河滩水位，然后使用水力学模型将这些水位转换为流量。数据约束意味着关于模型方程、边界条件和参数值的重要假设是必要的。在这篇论文中，我们使用了一个高分辨率的数字地形模型，该模型来自NASA的火星勘测轨道器背景相机立体图像，以开发一个比以前尝试的更精细的阶跃死水水力模型。此外，这些数据有助于对这种类型的模型进行比以前尝试的更关键、更正式和更广泛的评估。以阿萨巴斯卡谷的一条分流河道为例进行了研究。河滩流量估计中值为39,000立方米S−1，尽管根据所采用的假设，估计范围高达140,000立方米S−1。主要的不确定因素来自于对漫滩水位和下游边界条件的假设；在某些条件下，关于摩擦系数、水流临界性、扩张和收缩损失以及渠道几何细节的假设也是重要的。进一步在下游检查更多的DTM将允许将分析扩展到提供更已知边界条件的水力控制区段，从而改善流量估计。结论是，新一代DTM数据为更深入地洞察火星古水文学建模的挑战和机遇提供了机会，尽管还需要进一步的工作才能达到令人满意的置信度。
[1] Estimating magnitudes of flow rates in outflow channels has a central role in developing understanding of the paleohydrology of Mars. The typical approach to flow estimation is to identify geomorphic features, which indicate bankfull levels, and then use a hydraulic model to convert these levels into flow rates. Data constraints have meant that important assumptions about model equations, boundary conditions and parameter values have been necessary. In this paper, we use a high-resolution digital terrain model derived from NASA's Mars Reconnaissance Orbiter Context Camera stereopair imagery to develop a finer resolution step backwater hydraulic model than previously attempted. Furthermore, the data facilitate a more critical, more formal and broader assessment of this type of model than has previously been attempted. A distributary channel of Athabasca Valles is used as a case study. The median bankfull flow estimate was 39,000 m3 s−1, although estimates range up to 140,000 m3 s−1 depending on the assumptions employed. The principal uncertainties stem from assumptions about bankfull levels and downstream boundary conditions; and assumptions about the friction coefficient, criticality of flow, expansion and contraction losses, and geometric details of the channel are also important under certain conditions. Examination of additional DTMs further downstream would permit the analysis to be extended to hydraulic control sections that provide better-known boundary conditions, hence improving flow estimates. It is concluded that new-generation DTM data provide opportunity for deeper insight into the challenges and opportunities for modeling the paleohydrology of Mars, although further work is needed to achieve satisfactory levels of confidence.
火星阿瑞斯山谷灾难性外流事件的精确年表
影响因子：
5.3
作者：
Warner N
通讯作者：
Warner N