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Impact of Dynamically Changing Discharge on Hyporheic Exchange Processes Under Gaining and Losing Groundwater Conditions

Title data

Wu, Liwen ; Singh, Tanu ; Gomez-Velez, Jesus D. ; Nützmann, Gunnar ; Wörman, Anders ; Krause, Stefan ; Lewandowski, Jörg:
Impact of Dynamically Changing Discharge on Hyporheic Exchange Processes Under Gaining and Losing Groundwater Conditions.
In: Water Resources Research. Vol. 54 (2018) Issue 12 . - 10,076-10,093.
ISSN 1944-7973
DOI: https://doi.org/10.1029/2018WR023185

Abstract in another language

Abstract:Channel discharge, geomorphological setting, and regional groundwater flow determine the spatiotemporal variability of bedform-induced hyporheic exchange and the emergence of biogeochemical hot spots and hot moments that it drives. Of particular interest, and significantly understudied, is the role that dynamically changing discharge has on the hyporheic exchange process and how regional groundwater flow modulates the effects of transience. In this study, we use a reduced-complexity model to systematically explore the bedform-induced hyporheic responses to dynamically changing discharge events in systems with different bedform geometries exposed to varying degrees of groundwater flow (under both upwelling and downwelling conditions). With this in mind, we define metrics to quantify the effects of transience: spatial extent of the hyporheic zone, net hyporheic flux, mean residence time, and denitrification efficiency. We find that regional groundwater flow and geomorphological settings greatly modulate the temporal evolution of bedform-induced hyporheic responses driven by a single-peak discharge event. Effects of transience diminish with increasing groundwater upwelling or downwelling fluxes, decreasing bedform aspect ratios, and decreasing channel slopes. Additionally, we notice that increasing discharge intensities can reduce the modulating impacts of regional groundwater flow on the effects of transience but hardly overcomes the geomorphological controls. These findings highlight the necessities of evaluating hyporheic exchange processes in a morecomprehensive framework. Please note that an open access post-print version of this manuscript will be available after an embargo period here.

Further data

Item Type: Article in a journal
Refereed: Yes
Additional notes: BAYCEER150290
Institutions of the University: Research Institutions
Research Institutions > Research Centres
Research Institutions > Research Centres > Bayreuth Center of Ecology and Environmental Research- BayCEER
Result of work at the UBT: No
DDC Subjects: 500 Science
Date Deposited: 02 May 2019 10:22
Last Modified: 02 May 2019 10:22
URI: https://eref.uni-bayreuth.de/id/eprint/48283