Impact of Bed Form Celerity on Oxygen Dynamics in the Hyporheic Zone
Oxygen distribution and uptake in the hyporheic zone regulate various redox-sensitive reactions and influence habitat conditions. Despite the fact that fine-grain sediments in streams and rivers are commonly in motion, most studies on biogeochemistry have focused on stagnant sediments. In order to e...
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| Format: | Article |
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MDPI AG
2019-12-01
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| Series: | Water |
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| Online Access: | https://www.mdpi.com/2073-4441/12/1/62 |
| _version_ | 1811218252657852416 |
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| author | Philipp Wolke Yoni Teitelbaum Chao Deng Jörg Lewandowski Shai Arnon |
| author_facet | Philipp Wolke Yoni Teitelbaum Chao Deng Jörg Lewandowski Shai Arnon |
| author_sort | Philipp Wolke |
| collection | DOAJ |
| description | Oxygen distribution and uptake in the hyporheic zone regulate various redox-sensitive reactions and influence habitat conditions. Despite the fact that fine-grain sediments in streams and rivers are commonly in motion, most studies on biogeochemistry have focused on stagnant sediments. In order to evaluate the effect of bed form celerity on oxygen dynamics and uptake in sandy beds, we conducted experiments in a recirculating indoor flume. Oxygen distribution in the bed was measured under various celerities using 2D planar optodes. Bed morphodynamics were measured by a surface elevation sensor and time-lapse photography. Oxygenated zones in stationary beds had a conchoidal shape due to influx through the stoss side of the bed form, and upwelling anoxic water at the lee side. Increasing bed celerity resulted in the gradual disappearance of the upwelling anoxic zone and flattening of the interface between the oxic (moving fraction of the bed) and the anoxic zone (stationary fraction of the bed), as well as in a reduction of the volumetric oxygen uptake rates due shortened residence times in the hyporheic zone. These results suggest that including processes related to bed form migration are important for understanding the biogeochemistry of hyporheic zones. |
| first_indexed | 2024-04-12T07:07:49Z |
| format | Article |
| id | doaj.art-fdb96ec82db94705bec09108c3ab6eb9 |
| institution | Directory Open Access Journal |
| issn | 2073-4441 |
| language | English |
| last_indexed | 2024-04-12T07:07:49Z |
| publishDate | 2019-12-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Water |
| spelling | doaj.art-fdb96ec82db94705bec09108c3ab6eb92022-12-22T03:42:45ZengMDPI AGWater2073-44412019-12-011216210.3390/w12010062w12010062Impact of Bed Form Celerity on Oxygen Dynamics in the Hyporheic ZonePhilipp Wolke0Yoni Teitelbaum1Chao Deng2Jörg Lewandowski3Shai Arnon4Department Ecohydrology, Leibniz-Institute of Freshwater Ecology and Inland Fisheries, Müggelseedamm 310, 12587 Berlin, GermanyZuckerberg Institute for Water Research, The Jacob Blaustein Institutes for Desert Research, Ben-Gurion University of the Negev, 84990 Midreshet Ben-Gurion, IsraelZuckerberg Institute for Water Research, The Jacob Blaustein Institutes for Desert Research, Ben-Gurion University of the Negev, 84990 Midreshet Ben-Gurion, IsraelDepartment Ecohydrology, Leibniz-Institute of Freshwater Ecology and Inland Fisheries, Müggelseedamm 310, 12587 Berlin, GermanyZuckerberg Institute for Water Research, The Jacob Blaustein Institutes for Desert Research, Ben-Gurion University of the Negev, 84990 Midreshet Ben-Gurion, IsraelOxygen distribution and uptake in the hyporheic zone regulate various redox-sensitive reactions and influence habitat conditions. Despite the fact that fine-grain sediments in streams and rivers are commonly in motion, most studies on biogeochemistry have focused on stagnant sediments. In order to evaluate the effect of bed form celerity on oxygen dynamics and uptake in sandy beds, we conducted experiments in a recirculating indoor flume. Oxygen distribution in the bed was measured under various celerities using 2D planar optodes. Bed morphodynamics were measured by a surface elevation sensor and time-lapse photography. Oxygenated zones in stationary beds had a conchoidal shape due to influx through the stoss side of the bed form, and upwelling anoxic water at the lee side. Increasing bed celerity resulted in the gradual disappearance of the upwelling anoxic zone and flattening of the interface between the oxic (moving fraction of the bed) and the anoxic zone (stationary fraction of the bed), as well as in a reduction of the volumetric oxygen uptake rates due shortened residence times in the hyporheic zone. These results suggest that including processes related to bed form migration are important for understanding the biogeochemistry of hyporheic zones.https://www.mdpi.com/2073-4441/12/1/62hyporheic exchangebed form migrationmoving streambedripplesplanar optodes |
| spellingShingle | Philipp Wolke Yoni Teitelbaum Chao Deng Jörg Lewandowski Shai Arnon Impact of Bed Form Celerity on Oxygen Dynamics in the Hyporheic Zone Water hyporheic exchange bed form migration moving streambed ripples planar optodes |
| title | Impact of Bed Form Celerity on Oxygen Dynamics in the Hyporheic Zone |
| title_full | Impact of Bed Form Celerity on Oxygen Dynamics in the Hyporheic Zone |
| title_fullStr | Impact of Bed Form Celerity on Oxygen Dynamics in the Hyporheic Zone |
| title_full_unstemmed | Impact of Bed Form Celerity on Oxygen Dynamics in the Hyporheic Zone |
| title_short | Impact of Bed Form Celerity on Oxygen Dynamics in the Hyporheic Zone |
| title_sort | impact of bed form celerity on oxygen dynamics in the hyporheic zone |
| topic | hyporheic exchange bed form migration moving streambed ripples planar optodes |
| url | https://www.mdpi.com/2073-4441/12/1/62 |
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