Time‐lapse animation of hillslope groundwater dynamics details event‐based and seasonal bidirectional stream–groundwater gradients
Time‐lapse animation of hillslope groundwater dynamics details event‐based and seasonal bidirectional stream–groundwater gradients
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山坡地下水动力学的延时动画详细介绍了基于事件和季节性的双向河流-地下水梯度
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发表时间：
2017
期刊：
影响因子：
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通讯作者：
B. McGlynn
中科院分区：
文献类型：
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作者：
M. Zimmer;B. McGlynn
河流水-地下水（SW‐GW）相互作用和水文连通性是两个重要的过程，驱动了径流特征中的大部分变化。山坡流道连接的测量“快照”（Bracken等人，二〇一三年; Nippgen，McGlynn，& Emanuel，2015）和SW‐GW梯度以及相关的水文地球化学模式（Lautz & Fanelli，2008; Vidon & Hill，2004）通常用于对流域和河流响应的不同特征或状态进行分类。具有精细分辨率或长期数据集的研究仍然经常通过显示代表性时期或事件（例如，Nippgen，McGlynn，& Emanual，2015）。虽然这些快照方法提供了有用的信息，但它们可能过度简化复杂的交互或隐藏变化的时间尺度（例如，事件响应嵌套在季节动态）的山坡连接和SW-GW的相互作用，转变和流动逆转。由于这些问题，流域水文学家被鼓励超越快照方法（例如，Bracken等人，2013年）。湿润气候源头的常年溪流是流域水文学的常见焦点。在这些常年河段中，山坡连通性和SW‐GW梯度大小和方向的程度可以根据季节或事件的水文特征（如集水区蓄水和水文形态）在时间上发生变化（Jencso等人，2009; Nippgen等人，2015; Rodhe & Seibert，2011;托德，1955）。虽然这些常年流经常被视为一个获得流系统框架（冬季，哈维，弗兰克，和巷，1999年），很少有工作的特点，时间SW-GW的相互作用和山坡连接在这些源头流域的短暂和间歇性的部分。
Stream water–groundwater (SW‐GW) interactions and hydrological connectivity are two important processes that drive much of the variability seen in streamflow characteristics. Measurement “snapshots” of hillslope flowpath connections (Bracken et al., 2013; Nippgen, McGlynn, & Emanuel, 2015) and SW‐GW gradients and associated biogeochemical patterns (Lautz & Fanelli, 2008; Vidon & Hill, 2004) are commonly used to categorize different characteristics or states of catchment and stream response. Studies that have fine resolution or long‐term datasets still often distill this information by displaying representative periods or events (e.g., Nippgen, McGlynn, & Emanual, 2015). Although these snapshot approaches provide useful information, they can oversimplify complex interactions or conceal the varying time scales (e.g., event responses nested within seasonal dynamics) of hillslope connectivity and SW‐GW interactions, shifts, and flow reversals. Because of these issues, catchment hydrologists have been encouraged to move beyond the snapshot approach (e.g., Bracken et al., 2013). Perennial streams in headwaters of humid climates are common foci for catchment hydrology. In these perennial reaches, the degree of hillslope connectivity and SW‐GW gradient magnitudes and directions can temporally shift on seasonal or event bases dependent on hydrological characteristics such as catchment storage and hydromorphology (Jencso et al., 2009; Nippgen et al., 2015; Rodhe & Seibert, 2011; Todd, 1955). Although these perennial streams are often viewed within a gaining stream system framework (Winter, Harvey, Franke, & Alley, 1999), little work has characterized temporal SW‐GW interactions and hillslope connectivity within the ephemeral and intermittent sections of these headwater catchments.