Academic Journal
Where the past meets the present: connecting nitrogen from watersheds to streams through groundwater flowpaths
| العنوان: | Where the past meets the present: connecting nitrogen from watersheds to streams through groundwater flowpaths |
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| المؤلفون: | Eric M Moore, Janet R Barclay, Adam B Haynes, Kevin E Jackson, Alaina M Bisson, Martin A Briggs, Ashley M Helton |
| المصدر: | Environmental Research Letters, Vol 18, Iss 12, p 124039 (2023) |
| بيانات النشر: | IOP Publishing |
| سنة النشر: | 2023 |
| المجموعة: | Directory of Open Access Journals: DOAJ Articles |
| مصطلحات موضوعية: | groundwater discharge, nitrate, land use, contributing area, MODPATH, Environmental technology. Sanitary engineering, TD1-1066, Environmental sciences, GE1-350, Science, Physics, QC1-999 |
| الوصف: | Groundwater discharge to streams is a nonpoint source of nitrogen (N) that confounds N mitigation efforts and represents a significant portion of the annual N loading to watersheds. However, we lack an understanding of where and how much groundwater N enters streams and watersheds. Nitrogen concentrations at the end of groundwater flowpaths are the culmination of biogeochemical and physical processes from the contributing land area where groundwater recharges, within the aquifer system, and in the near-stream riparian area where groundwater discharges to streams. Our research objectives were to quantify the spatial distribution of N concentrations at groundwater discharges throughout a mixed land-use watershed and to evaluate how relationships among contributing and riparian land cover, modeled aquifer characteristics, and groundwater discharge biogeochemistry explain the spatial variation in groundwater discharge N concentrations. We accomplished this by integrating high-resolution thermal infrared surveys to locate groundwater discharge, biogeochemical sampling of groundwater, and a particle tracking model that links groundwater discharge locations to their contributing area land cover. Groundwater N loading from groundwater discharges within the watershed varied substantially between and within streambank groundwater discharge features. Groundwater nitrate concentrations were spatially heterogeneous ranging from below 0.03–11.45 mg-N/L, varying up to 20-fold within meters. When combined with the particle tracking model results and land cover metrics, we found that groundwater discharge nitrate concentrations were best predicted by a linear mixed-effect model that explained over 60% of the variation in nitrate concentrations, including aquifer chemistry (dissolved oxygen, Cl ^− , SO _4 ^2− ), riparian area forested land cover, and modeled physical aquifer characteristics (discharge, Euclidean distance). Our work highlights the significant spatial variability in groundwater discharge nitrate concentrations ... |
| نوع الوثيقة: | article in journal/newspaper |
| اللغة: | English |
| تدمد: | 1748-9326 |
| Relation: | https://doi.org/10.1088/1748-9326/ad0c86; https://doaj.org/toc/1748-9326; https://doaj.org/article/1ab989ef1d134a0e995e124bfcc45f1b |
| DOI: | 10.1088/1748-9326/ad0c86 |
| الاتاحة: | https://doi.org/10.1088/1748-9326/ad0c86 https://doaj.org/article/1ab989ef1d134a0e995e124bfcc45f1b |
| رقم الانضمام: | edsbas.6FE1AB06 |
| قاعدة البيانات: | BASE |
Full Text Finder | تدمد: | 17489326 |
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| DOI: | 10.1088/1748-9326/ad0c86 |