Dominant source areas shift seasonally from longitudinal to lateral contributions in a montane headwater stream
Dominant source areas shift seasonally from longitudinal to lateral contributions in a montane headwater stream
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山地源头水流中的主要源区季节性从纵向贡献转向横向贡献
DOI：
10.1016/j.jhydrol.2023.129134
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发表时间：
2023
影响因子：
6.4
通讯作者：
Barnard, Holly R.
中科院分区：
文献类型：
--
作者：
Bush, Sidney A.;Birch, Andrew L.;Warix, Sara R.;Sullivan, Pamela L.;Gooseff, Michael N.;McKnight, Diane M.;Barnard, Holly R.
山地生态区是下游水文功能的重要载体，但他们的动态相对研究不足相比，在美国西部的高山和亚高山流域。山地集水区的经验，降水输入的季节性变化，这导致在源区的流贡献的时空差异。我们收集了2018年至2021年美国科罗拉多前山脉2.65平方公里半干旱水源集水区的水文和地球化学数据。使用水文监测，地球化学表征和端元混合分析（EMMA）相结合的方法，我们评估高上坡积累和流之间的水文连通性。在我们的研究区域内，高上坡堆积区对应于冲积/崩积扇，我们集中在仪器和水样采集。使用观测到的降雨量，地下水位，土壤水分和径流的多年测量，我们观察到不同的水文季节在我们的集水区的特点是融雪在春季，暴雨在夏季，并返回到基流在秋季。在此框架内，我们发现，源区径流转移与纵向距离下游，水文季节之间。值得注意的是，我们的EMMA结果表明，从上游源区的贡献变得不那么重要，从春季融雪到秋季返回基流的横向输入。这是最明显的上游流域，上游的贡献，流量下降到33.3%之间的春季和秋季。这些结果表明，径流是由当地的源区横向和垂直贡献。我们的研究结果反映了水文连通性在空间和时间上的动态变化，这对美国西部快速气候变化的土地和水资源管理越来越重要。
Montane ecoregions are important vehicles for downstream hydrologic function, but their dynamics are relatively understudied compared to alpine and subalpine catchments in the western United States. Montane catchments experience shifts in precipitation inputs seasonally, which results in spatiotemporal differences in source area contributions to the stream. We collected hydrometric and geochemical data between 2018 and 2021 from a 2.65 km2semi-arid headwater catchment in the Front Range of Colorado, USA. Using a combined approach of hydrometric monitoring, geochemical characterization, and end-member mixing analysis (EMMA), we assess hydrologic connectivity between areas with high upslope accumulation and the stream. Within our study area, high upslope accumulation area corresponded to alluvial/ colluvial fans wherein we focused instrumentation and water sample collection. Using observed rainfall, and multiyear measurements of groundwater levels, soil moisture, and streamflow, we observed distinct hydrologic seasons within our catchment characterized by snowmelt during the spring, rainstorms during the summer, and a return to baseflow during the fall. Within this framework, we found that source areas to streamflow shift with longitudinal distance downstream, and among hydrologic seasons. Notably, our EMMA results indicate that contributions from upstream source areas become less important than lateral inputs from spring snowmelt into the fall return to baseflow. This was most pronounced at the upper catchment where upstream contributions to streamflow decreased up to 33.3% between spring and fall. These results suggest that streamflow is maintained by local source areas contributing laterally and vertically. Our results reflect dynamic shifts in hydrologic connectivity in space and in time, which are increasingly important to land and water resource management given rapid climate changes within the western United States.
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可变冲刷机制和景观结构控制一组嵌套集水区融雪期间 DOC 输出流
DOI：
--
发表时间：
2010
期刊：
影响因子：
--
作者：
V. Pacific;K. Jencso;B. McGlynn
通讯作者：
B. McGlynn
探索季节性衰退期间河流基流生成的空间分布变化
影响因子：
5.4
作者：
R. Payn;M. Gooseff;B. McGlynn;K. Bencala;S. Wondzell
通讯作者：
S. Wondzell
影响因子：
5.4
作者：
D'Odorico, P;Rigon, R
通讯作者：
Rigon, R
气候变化导致美国俄勒冈州 H.J. 安德鲁斯实验森林河网收缩和断流
影响因子：
2.9
作者：
Ward, Adam S.;Wondzell, Steven M.;Schmadel, Noah M.;Herzog, Skuyler P.
通讯作者：
Herzog, Skuyler P.
DOI：
--
发表时间：
2015
期刊：
影响因子：
--
作者：
S. Kampf;J. Markus;J. Heath;C. Moore
通讯作者：
C. Moore