Nevertheless, they persisted: Can hyporheic zones increase the persistence of estrogens in streams?

2021 ◽  
Author(s):  
Frederick Y. Cheng ◽  
Heather E. Preisendanz ◽  
Michael L. Mashtare ◽  
Linda S. Lee ◽  
Nandita B. Basu
Keyword(s):  
Hyporheic Zones

Effects of riffle–step restoration on hyporheic zone chemistry in N-rich lowland streams

2006 ◽  
Vol 63 (1) ◽  
pp. 120-133 ◽  
Author(s):  
Tamao Kasahara ◽  
Alan R Hill
Keyword(s):  
Urban Areas ◽  
Hyporheic Zone ◽  
Stream Water ◽  
Ion Concentration ◽  
Hyporheic Exchange ◽  
Ecosystem Functions ◽  
Exchange Flow ◽  
Nutrient Inputs ◽  
Lowland Streams ◽  
Hyporheic Zones

Stream restoration projects that aim to rehabilitate ecosystem health have not considered surface–subsurface linkages, although stream water and groundwater interaction has an important role in sustaining stream ecosystem functions. The present study examined the effect of constructed riffles and a step on hyporheic exchange flow and chemistry in restored reaches of several N-rich agricultural and urban streams in southern Ontario. Hydrometric data collected from a network of piezometers and conservative tracer releases indicated that the constructed riffles and steps were effective in inducing hyporheic exchange. However, despite the use of cobbles and boulders in the riffle construction, high stream dissolved oxygen (DO) concentrations were depleted rapidly with depth into the hyporheic zones. Differences between observed and predicted nitrate concentrations based on conservative ion concentration patterns indicated that these hyporheic zones were also nitrate sinks. Zones of low hydraulic conductivity and the occurrence of interstitial fines in the restored cobble-boulder layers suggest that siltation and clogging of the streambed may reduce the downwelling of oxygen- and nitrate-rich stream water. Increases in streambed DO levels and enhancement of habitat for hyporheic fauna that result from riffle–step construction projects may only be temporary in streams that receive increased sediment and nutrient inputs from urban areas and croplands.

MTBE, TBA, and TAME Attenuation in Diverse Hyporheic Zones

Ground Water ◽  
2010 ◽  
Vol 48 (1) ◽  
pp. 30-41 ◽  
Author(s):  
James E. Landmeyer ◽  
Paul M. Bradley ◽  
Donald A. Trego ◽  
Kevin G. Hale ◽  
Joseph E. Haas
Keyword(s):  
Hyporheic Zones

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

2019 ◽  
Vol 55 (1) ◽  
pp. 218-235 ◽  
Author(s):  
Tanu Singh ◽  
Liwen Wu ◽  
Jesus D. Gomez‐Velez ◽  
Jörg Lewandowski ◽  
David M. Hannah ◽  
...  
Keyword(s):  
Peak Flow ◽  
Hyporheic Exchange ◽  
Hyporheic Zones

Geochemistry of contrasting stream types, Taylor Valley, Antarctica

2020 ◽  
Vol 133 (1-2) ◽  
pp. 425-448
Author(s):  
Russell S. Harmon ◽  
Deborah L. Leslie ◽  
W. Berry Lyons ◽  
Kathleen A. Welch ◽  
Diane M. McKnight
Keyword(s):  
Dissolved Oxygen ◽  
Austral Summer ◽  
Mineral Dissolution ◽  
Silicate Mineral ◽  
Cation Composition ◽  
Taylor Valley ◽  
Low Concentrations ◽  
Hyporheic Zones ◽  
Dry Valley ◽  
Geochemical Fingerprint

Abstract The McMurdo Dry Valley region is the largest ice-free area of Antarctica. Ephemeral streams flow here during the austral summer, transporting glacial meltwater to perennially ice-covered, closed basin lakes. The chemistry of 24 Taylor Valley streams was examined over the two-decade period of monitoring from 1993 to 2014, and the geochemical behavior of two streams of contrasting physical and biological character was monitored across the seven weeks of the 2010–2011 flow season. Four species dominate stream solute budgets: HCO3–, Ca2+, Na+, and Cl–, with SO42–, Mg2+, and K+ present in significantly lesser proportions. All streams contain dissolved silica at low concentrations. Across Taylor Valley, streams are characterized by their consistent anionic geochemical fingerprint of HCO3 > Cl > SO4, but there is a split in cation composition between 14 streams with Ca > Na > Mg > K and 10 streams with Na > Ca > Mg > K. Andersen Creek is a first-order proglacial stream representative of the 13 short streams that flow <1.5 km from source to gage. Von Guerard is representative of 11 long streams 2–7 km in length characterized by extensive hyporheic zones. Both streams exhibit a strong daily cycle for solute load, temperature, dissolved oxygen, and pH, which vary in proportion to discharge. A well-expressed diurnal co-variation of pH with dissolved oxygen is observed for both streams that reflects different types of biological control. The relative consistency of Von Guerard composition over the summer flow season reflects chemostatic regulation, where water in transient storage introduced during times of high streamflow has an extended opportunity for water-sediment interaction, silicate mineral dissolution, and pore-water exchange.

Watershed-scale distributions of heavy metals in the hyporheic zones of a heavily polluted Maozhou River watershed, southern China

Chemosphere ◽  
2020 ◽  
Vol 239 ◽  
pp. 124773 ◽  
Author(s):  
Kai Yu ◽  
Yanhua Duan ◽  
Peng Liao ◽  
Lin Xie ◽  
Qianqian Li ◽  
...  
Keyword(s):  
Heavy Metals ◽  
Southern China ◽  
Watershed Scale ◽  
River Watershed ◽  
Hyporheic Zones
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