Determining How Critical Zone Structure Constrains Hydrogeochemical Behavior of Watersheds: Learning From an Elevation Gradient in California's Sierra Nevada
Determining How Critical Zone Structure Constrains Hydrogeochemical Behavior of Watersheds: Learning From an Elevation Gradient in California's Sierra Nevada
复制标题
确定关键区域结构如何限制流域的水文地球化学行为：从加利福尼亚州内华达山脉的高程梯度中学习
DOI：
10.3389/frwa.2020.00023
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发表时间：
2020
影响因子：
4.3
通讯作者：
R. Bales
中科院分区：
文献类型：
--
作者：
J. Ackerer;C. Steefel;Fengjing Liu;R. Bart;M. Safeeq;A. O’Geen;C. Hunsaker;R. Bales
浓度-流量（C-Q）关系可以提供洞察关键区（CZ）的动态行为，因为C-Q关系整合了流域水文地球化学过程的空间分布和时间。本研究融合了地貌分析，C-Q关系和反应性输运建模，使用丰富的数据集，从海拔梯度的8个流域在南部山脉内华达州，加州。研究发现，CZ结构对C-Q关系和水源地水文地球化学行为具有很强的控制作用。具有薄风化层、大型水系和有限水储存的流域具有快速的平均通过时间，沿着地下流线，并显示出水流中离子浓度的有限季节性变化（即，恒化行为）。相比之下，具有较厚风化层、小河流网络和更多水储存的流域沿沿着地下流线的过境时间较长，并表现出更大的化学变化性（即，化学动力学行为）。从其他同位素，水文和地球物理研究的平均过境时间和水存储的独立估计是一致的C-Q关系建模的结果。流化学及其变异性控制的风化层内的侧流，并没有深层地下水的混合需要解释所观察到的化学变异。这项研究打开了可能性，以估计蓄水量和平均过境时间，从而在流域抗旱性，通过使用定量建模的C-Q关系。
Concentration-discharge (C-Q) relations can provide insight into the dynamic behavior of the Critical Zone (CZ), as C-Q relations integrate the spatial distribution and timing of watershed hydrogeochemical processes. This study blends geomorphologic analysis, C-Q relations and reactive-transport modeling using a rich dataset from an elevation gradient of eight watersheds in the Southern Sierra Nevada, California. We found that the CZ structure exerts a strong control on the C-Q relations, and on the hydrogeochemical behavior of headwater watersheds. Watersheds with thin regolith, a large stream network, and limited water storage have fast mean transit times along subsurface flow lines, and show limited seasonal variability in ionic concentrations in streamflow (i.e., chemostatic behavior). In contrast, watersheds with thicker regolith, a small stream network and more water storage have longer transit times along subsurface flow lines, and exhibit greater chemical variability (i.e., chemodynamic behavior). Independent estimates of mean transit times and water storage from other isotopic, hydrologic and geophysical studies were consistent with results from modeling C-Q relations. The stream chemistry and its variability were controlled by lateral flow within the regolith, and no mixing with deep groundwater was needed to explain the observed chemical variability. This study opens the possibility to estimate water-storage capacity and mean transit times, and thus drought resistance in watersheds, by using quantitative modeling of C-Q relations.
影响因子：
3.9
作者：
P. Sullivan;Marvin Wes Stops;G. Macpherson;Li Li-Li;D. Hirmas;W. Dodds
通讯作者：
P. Sullivan;Marvin Wes Stops;G. Macpherson;Li Li-Li;D. Hirmas;W. Dodds
通过收敛山坡的常年流动解释了页岩源头集水区的化学动力学溶质行为
影响因子：
3.9
作者：
Herndon, Elizabeth M.;Steinhoefel, Grit;Dere, Ashlee L.D.;Sullivan, Pamela L.
通讯作者：
Sullivan, Pamela L.
发展受阻：加利福尼亚州内华达山脉南部的侵蚀平衡通过河道切入和山坡沉积物产生之间的反馈来维持
DOI：
10.1130/b35006.1
发表时间：
2019
期刊：
GSA Bulletin
影响因子：
--
作者：
Callahan, Russell P.;Ferrier, Ken L.;Dixon, Jean;Dosseto, Anthony;Hahm, W. Jesse;Jessup, Barbara S.;Miller, Scott N.;Hunsaker, Carolyn T.;Johnson, Dale W.;Sklar, Leonard S.
通讯作者：
Sklar, Leonard S.