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The Effect of Stream Discharge on Hyporheic Exchange

Title data

Mojarrad, Brian Babak ; Betterle, Andrea ; Singh, Tanu ; Olid, Carolina ; Wörman, Anders:
The Effect of Stream Discharge on Hyporheic Exchange.
In: Water. Vol. 11 (2019) Issue 7 . - No. 1436.
ISSN 2073-4441
DOI: https://doi.org/10.3390/w11071436

Abstract in another language

Streambed morphology, streamflow dynamics, and the heterogeneity of streambed sediments critically controls the interaction between surface water and groundwater. The present study investigated the impact of different flow regimes on hyporheic exchange in a boreal stream in northern Sweden using experimental and numerical approaches. Low-, base-, and high-flow discharges were simulated by regulating the streamflow upstream in the study area, and temperature was used as the natural tracer to monitor the impact of the different flow discharges on hyporheic exchange fluxes in stretches of stream featuring gaining and losing conditions. A numerical model was developed using geomorphological and hydrological properties of the stream and was then used to perform a detailed analysis of the subsurface water flow. Additionally, the impact of heterogeneity in sediment permeability on hyporheic exchange fluxes was investigated. Both the experimental and modelling results show that temporally increasing flow resulted in a larger (deeper) extent of the hyporheic zone as well as longer hyporheic flow residence times. However, the result of the numerical analysis is strongly controlled by heterogeneity in sediment permeability. In particular, for homogeneous sediments, the fragmentation of upwelling length substantially varies with streamflow dynamics due to the contribution of deeper fluxes.

Further data

Item Type: Article in a journal
Refereed: Yes
Additional notes: BAYCEER154063
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: Yes
DDC Subjects: 500 Science
Date Deposited: 28 Jan 2020 08:03
Last Modified: 08 May 2020 11:24
URI: https://eref.uni-bayreuth.de/id/eprint/53783