scholarly journals Time‐Variable Transit Time Distributions in the Hyporheic Zone of a Headwater Mountain Stream

2018 ◽  
Vol 54 (3) ◽  
pp. 2017-2036 ◽  
Author(s):  
Adam S. Ward ◽  
Noah M. Schmadel ◽  
Steven M. Wondzell
Keyword(s):  
Transit Time ◽  
Hyporheic Zone ◽  
Time Variable ◽  
Mountain Stream

scholarly journals Organic matter storage and decomposition in the hyporheic zone of a mountain stream

2018 ◽  
Vol 60 (2) ◽  
pp. 193-203
Author(s):  
Tomoya KUBO ◽  
Tamao KASAHARA ◽  
Masaaki CHIWA ◽  
Kyouichi OTSUKI
Keyword(s):  
Organic Matter ◽  
Hyporheic Zone ◽  
Mountain Stream

scholarly journals Carbon dynamics in the hyporheic zone of a headwater mountain stream in the Cascade Mountains, Oregon

2016 ◽  
Vol 52 (10) ◽  
pp. 7556-7576 ◽  
Author(s):  
Hayley A. Corson-Rikert ◽  
Steven M. Wondzell ◽  
Roy Haggerty ◽  
Mary V. Santelmann
Keyword(s):  
Hyporheic Zone ◽  
Carbon Dynamics ◽  
Mountain Stream ◽  
Cascade Mountains

Influence of Exchange Flow Between the Channel and Hyporheic Zone on Nitrate Production in a Small Mountain Stream

1990 ◽  
Vol 47 (11) ◽  
pp. 2099-2111 ◽  
Author(s):  
Frank J. Triska ◽  
John H. Duff ◽  
Ronald J. Avanzino
Keyword(s):  
Dissolved Oxygen ◽  
Hyporheic Zone ◽  
Mountain Stream ◽  
Ammonium Concentration ◽  
Nitrification Inhibitors ◽  
Exchange Flow ◽  
Concentration Gradients ◽  
Local Exchange ◽  
Nitrate Production ◽  
Subsurface Waters

Variation in local exchange of flows between the channel and hyporheic zone produced temporally shifting concentration gradients of dissolved oxygen, nitrate, and ammonium in subsurface waters of a small, gravel-cobble bed stream. Channel water advected laterally supplied dissolved oxygen, and groundwater supplied ammonium to support hyporheic nitrification. Nitrate production was highest in sediment slurries from aerobic hyporheic sites, was absent at nearly anoxic sites, and was stopped by nitrification inhibitors (chlorate and nitrapyrin). Ammonium amendment to sediment slurries only slightly enhanced nitrate production indicating that sorption competed with biota for available substrate. Nitrate concentration increased from 75–130 μg N/L during 9 d of ammonium amendment to a hyporheic subsurface flow. Ammonium concentration rose slowly relative to a sulfate tracer initially, and declined slowly after cutoff as ammonium desorbed. Nitrate levels remained elevated for 6 d after cutoff as desorbed ammonium became biotically available. Interactions between the channel's hydrology, lithology, and biology such as we observed in nitrate production are probably more common than reported. However, the magnitude of the resulting nutrient flux will depend on factors which determine the depth and lateral extension of suitable hyporheic habitat.

scholarly journals Solute Transport and Transformation in an Intermittent, Headwater Mountain Stream with Diurnal Discharge Fluctuations

Water ◽  
2019 ◽  
Vol 11 (11) ◽  
pp. 2208 ◽  
Author(s):  
Ward ◽  
Kurz ◽  
Schmadel ◽  
Knapp ◽  
Blaen ◽  
...  
Keyword(s):  
Solute Transport ◽  
Time Variable ◽  
Mountain Stream ◽  
Selection Function ◽  
Transport And Transformation ◽  
Discharge Fluctuations ◽  
Single Discharge ◽  
Reaction Potential ◽  
Stream Control ◽  
Reactive Solutes

Time-variable discharge is known to control both transport and transformation of solutes in the river corridor. Still, few studies consider the interactions of transport and transformation together. Here, we consider how diurnal discharge fluctuations in an intermittent, headwater stream control reach-scale solute transport and transformation as measured with conservative and reactive tracers during a period of no precipitation. One common conceptual model is that extended contact times with hyporheic zones during low discharge conditions allows for increased transformation of reactive solutes. Instead, we found tracer timescales within the reach were related to discharge, described by a single discharge-variable StorAge Selection function. We found that Resazurin to Resorufin (Raz-to-Rru) transformation is static in time, and apparent differences in reactive tracer were due to interactions with different ages of storage, not with time-variable reactivity. Overall we found reactivity was highest in youngest storage locations, with minimal Raz-to-Rru conversion in waters older than about 20 h of storage in our study reach. Therefore, not all storage in the study reach has the same potential biogeochemical function and increasing residence time of solute storage does not necessarily increase reaction potential of that solute, contrary to prevailing expectations.

scholarly journals Acetate retention and metabolism in the hyporheic zone of a mountain stream

1999 ◽  
Vol 44 (6) ◽  
pp. 1530-1539 ◽  
Author(s):  
Michelle A. Baker ◽  
Clifford N. Dahm ◽  
H. Maurice Valett
Keyword(s):  
Hyporheic Zone ◽  
Mountain Stream
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