Continental-scale analysis of shallow and deep groundwater contributions to streams.
Continental-scale analysis of shallow and deep groundwater contributions to streams.
复制标题
DOI：
10.1038/s41467-021-21651-0
复制
发表时间：
2021-03-04
影响因子：
16.6
通讯作者：
Briggs MA
中科院分区：
文献类型：
--
作者：
Hare DK;Helton AM;Johnson ZC;Lane JW;Briggs MA
地下水排放产生径流并影响河流热状况。然而，地下水的水质和热缓冲能力取决于含水层的源深。在这里，我们对多年的空气和流温度信号进行分类，1729个网站在美国大陆有重大水坝的影响，浅或深的地下水签名，或缺乏明显的地下水（大气）签名。大约40%的非大坝河流站点有大量的地下水贡献，如特征成对的空气和河流温度信号度量所示。具有浅层地下水特征的溪流占所有地下水特征点的一半，与具有深层地下水特征的地点相比，基流减少，变暖趋势的比例更高。这些发现与浅层地下水更容易受到温度升高和枯竭的理论相一致。具有大气特征的河流倾向于排干坡度较低和人为干扰较大的流域，这表明在人口密集的山谷环境中河流-地下水连通性降低。地下水排放产生径流并影响河流热状况。该研究通过使用一种基于几何的方法对美国1700多条溪流进行分类，表明溪流对压力源的脆弱性取决于地下水排放的含水层源深度
Groundwater discharge generates streamflow and influences stream thermal regimes. However, the water quality and thermal buffering capacity of groundwater depends on the aquifer source-depth. Here, we pair multi-year air and stream temperature signals to categorize 1729 sites across the continental United States as having major dam influence, shallow or deep groundwater signatures, or lack of pronounced groundwater (atmospheric) signatures. Approximately 40% of non-dam stream sites have substantial groundwater contributions as indicated by characteristic paired air and stream temperature signal metrics. Streams with shallow groundwater signatures account for half of all groundwater signature sites and show reduced baseflow and a higher proportion of warming trends compared to sites with deep groundwater signatures. These findings align with theory that shallow groundwater is more vulnerable to temperature increase and depletion. Streams with atmospheric signatures tend to drain watersheds with low slope and greater human disturbance, indicating reduced stream-groundwater connectivity in populated valley settings. Groundwater discharge generates streamflow and influences stream thermal regimes. Classifying more than 1700 streams across the US by using an empirically-based approach the study shows that the vulnerability of streams to stressors depends on the aquifer source-depth of groundwater discharge
登录
查看更多内容
影响因子：
5.4
作者：
Burns, Erick R.;Zhu, Yonghui;Dunham, Jason B.
通讯作者：
Dunham, Jason B.
影响因子：
2.4
作者：
Essaid, Hedeff I.;Baker, Nancy T.;McCarthy, Kathleen A.
通讯作者：
McCarthy, Kathleen A.
影响因子：
1.4
作者：
Baird, OE;Krueger, CC
通讯作者：
Krueger, CC
影响因子：
4.9
作者：
Carslaw, David C.;Ropkins, Karl
通讯作者：
Ropkins, Karl
影响因子：
9.8
作者：
Cozzarelli, Isabelle M.;Kent, Douglas B.;Akob, Denise M.
通讯作者：
Akob, Denise M.