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Dynamic Hyporheic Zones : Exploring the Role of Peak-Flow Events on Bedform‐Induced Hyporheic Exchange

Title data

Singh, Tanu ; Wu, Liwen ; Gomez-Velez, Jesus D. ; Lewandowski, Jörg ; Hannah, David M. ; Krause, Stefan:
Dynamic Hyporheic Zones : Exploring the Role of Peak-Flow Events on Bedform‐Induced Hyporheic Exchange.
In: Water Resources Research. Vol. 55 (2018) Issue 1 . - pp. 218-235.
ISSN 1944-7973
DOI: https://doi.org/10.1029/2018wr022993

Abstract in another language

Discharge varies in space and time, driving hyporheic exchange processes in river corridors that affect biogeochemical cycling and ultimately control the dynamics of biogeochemical hot spots and hot moments. Herein, we use a reduced‐order model to conduct the systematic analysis of the interplay between discharge variability (peak flow intensities, duration, and skewness) and streambed topography (bedform aspect ratios and channel slopes) and their role in the flow and transport characteristics of hyporheic zones (HZs). We use a simple and robust conceptualization of single peak flow events for a series of periodic sinusoidal bedforms. Using the model, we estimate the spatial extent of the HZ, the total amount of exchange, and the residence time of water and solutes within the reactive environment and its duration relative to typical time scales for oxygen consumption (i.e., a measure of the denitrification potential). Our results demonstrate that HZ expansion and contraction is controlled by events yet modulated by ambient groundwater flow. Even though the change in hyporheic exchange flux (%) relative to baseflow conditions is invariant for different values of channel slopes, absolute magnitudes varied substantially. Primarily, peak flow events cause more discharge of older water for the higher aspect ratios (i.e., for dunes and ripples) and lower channel slopes. Variations in residence times during peak flow events lead to the development of larger areas of potential nitrification and denitrification in the HZ for longer durations. These findings have potential implications for river management and restoration, particularly the need for (re)consideration of the importance of hyporheic exchange under dynamic flow conditions.

Further data

Item Type: Article in a journal
Refereed: Yes
Additional notes: BAYCEER150262
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 10:17
Last Modified: 02 May 2019 10:17
URI: https://eref.uni-bayreuth.de/id/eprint/48266