Investigating spatial variability of vertical water fluxes through the streambed in distinctive stream morphologies using temperature and head data |
| |
Authors: | Liping Wang Weiwei Jiang Jinxi Song Xinyi Dou Hongtao Guo Shaofeng Xu Guotao Zhang Ming Wen Yongqing Long Qi Li |
| |
Institution: | 1.College of Urban and Environmental Sciences,Northwest University,Xi’an,China;2.College of Water Sciences,Beijing Normal University,Beijing,China;3.State Key Laboratory of Soil Erosion and Dryland Farming on the Loess Plateau,Institute of Soil and Water Conservation, CAS & MWR,Yangling,China;4.Chongqing Academy of Environmental Science,Chongqing,China |
| |
Abstract: | Investigating the interaction of groundwater and surface water is key to understanding the hyporheic processes. The vertical water fluxes through a streambed were determined using Darcian flux calculations and vertical sediment temperature profiles to assess the pattern and magnitude of groundwater/surface-water interaction in Beiluo River, China. Field measurements were taken in January 2015 at three different stream morphologies including a meander bend, an anabranching channel and a straight stream channel. Despite the differences of flux direction and magnitude, flux directions based on vertical temperature profiles are in good agreement with results from Darcian flux calculations at the anabranching channel, and the Kruskal-Wallis tests show no significant differences between the estimated upward fluxes based on the two methods at each site. Also, the upward fluxes based on the two methods show similar spatial distributions on the streambed, indicating (1) that higher water fluxes at the meander bend occur from the center of the channel towards the erosional bank, (2) that water fluxes at the anabranching channel are higher near the erosional bank and in the center of the channel, and (3) that in the straight channel, higher water fluxes appear from the center of the channel towards the depositional bank. It is noted that higher fluxes generally occur at certain locations with higher streambed vertical hydraulic conductivity (K v) or where a higher vertical hydraulic gradient is observed. Moreover, differences of grain size, induced by stream morphology and contrasting erosional and depositional conditions, have significant effects on streambed K v and water fluxes. |
| |
Keywords: | |
本文献已被 SpringerLink 等数据库收录! |
|