Mixing as a driver of temporal variations in river hydrochemistry: 1. Insights from conservative tracers in the Andes-Amazon transition: ANDES-AMAZON TRIBUTARY MIXING
Mixing as a driver of temporal variations in river hydrochemistry: 1. Insights from conservative tracers in the Andes-Amazon transition: ANDES-AMAZON TRIBUTARY MIXING
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混合作为河流水化学时间变化的驱动因素：1.安第斯山脉-亚马逊过渡期保守示踪剂的见解：安第斯山脉-亚马逊支流混合
DOI：
10.1002/2016wr019733
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发表时间：
2017
影响因子：
5.4
通讯作者：
West, A. Joshua
中科院分区：
文献类型：
--
作者：
Torres, Mark A.;Baronas, J. Jotautas;Clark, Kathryn E.;Feakins, Sarah J.;West, A. Joshua
山坡过程对降水变化的响应可能会导致河流溶质地球化学随流量的变化。当影响山坡过程的关键环境因素（例如，岩性、侵蚀率和气候）在河流集水区的影响最小。对于集水区不均匀的河流，不同支流子集水区相对贡献的时间变化可能会调节径流中溶质地球化学的变化。在没有一个密集的水文站网络，替代方法需要区分河流溶质浓度的时间变化的不同驱动因素。在这方面的贡献，我们分摊的水和溶质通量达到的马德雷德迪奥斯河（秘鲁）之间的四个主要支流子流域在两个采样活动（雨季和旱季）使用保守的示踪剂的空间变化。的混合模型的结果的指导下，我们确定的主要干马德雷德迪奥斯，是由于每个支流的相对贡献的变化的溶质浓度的时间变化。我们的研究结果表明，支流混合的变化是，部分，负责观察到的浓度-流量（C-Q）的关系。这些结果的影响，进一步探讨了重新分析以前发表的C-Q数据从这个地区，开发支流混合的理论模型，并在配套文件中，比较C-Q行为的一套主要和微量元素的马德雷德迪奥斯河系统。
The response of hillslope processes to changes in precipitation may drive the observed changes in the solute geochemistry of rivers with discharge. This conjecture is most robust when variations in the key environmental factors that affect hillslope processes (e.g., lithology, erosion rate, and climate) are minimal across a river's catchment area. For rivers with heterogenous catchments, temporal variations in the relative contributions of different tributary subcatchments may modulate variations in solute geochemistry with runoff. In the absence of a dense network of hydrologic gauging stations, alternative approaches are required to distinguish between the different drivers of temporal variability in river solute concentrations. In this contribution, we apportion the water and solute fluxes of a reach of the Madre de Dios River (Peru) between its four major tributary subcatchments during two sampling campaigns (wet and dry seasons) using spatial variations in conservative tracers. Guided by the results of a mixing model, we identify temporal variations in solute concentrations of the main stem Madre de Dios that are due to changes in the relative contributions of each tributary. Our results suggest that variations in tributary mixing are, in part, responsible for the observed concentration‐discharge (C‐Q) relationships. The implications of these results are further explored by reanalyzing previously published C‐Q data from this region, developing a theoretical model of tributary mixing, and, in a companion paper, comparing the C‐Q behavior of a suite of major and trace elements in the Madre de Dios River system.