Temperature decrease along hyporheic pathlines in a large river riparian zone
Temperature decrease along hyporheic pathlines in a large river riparian zone
复制标题
大型河流沿岸地区沿潜流路径的温度下降
DOI：
10.1002/eco.2160
复制
发表时间：
2019
期刊：
影响因子：
2.6
通讯作者：
K. Forshay
中科院分区：
文献类型：
--
作者：
B. Faulkner;J. Brooks;Druscilla M. Keenan;K. Forshay
潜流区有助于降低许多河流的温度，创造了一个纵向异质阵列的热避难所。在这项研究中，我们有独特的机会展示大型河流系统中沿着自流区路径的温度降低，这有助于通过排放到河道外栖息地来维持避难所。温度进行了监测，在一个密集的网络威尔斯，位于小岛屿沿着的路径，确定从校准的地下水流模型。沿沿着一条600 m的线路温度降低约7° C。在邻近河流的三个岛屿中，北方两个岛屿的温度随距离呈指数下降，拟合的热Péclet数为2.7和6.5，而南部岛屿没有显着下降。我们认为，这是由于较高的渗透率在雨季在这个更大，更成熟的岛屿，抑制在雨季的潜流。
Hyporheic zones contribute to lower temperatures in many rivers, creating a longitudinal heterogeneous array of thermal refuges. In this study, we had the unique opportunity to show temperature reduction along hyporheic zone pathlines in a large river system that contribute to the maintenance of refuges through discharge into off‐channel habitats. Temperature was monitored in a dense network of wells that were located along pathlines in small islands, determined from a calibrated groundwater flow model. Temperature along one 600‐m pathline was reduced about 7° C. Among three islands that were adjacent to the river, the northern two showed exponential decrease in temperature with distance, with fitted thermal Péclet numbers of 2.7 and 6.5, whereas the southern island showed no significant decrease. We suggest that this is due to the higher infiltration rate in the wet season in this larger, more mature island, which suppresses hyporheic flow in the wet season.