Bridging the gap from hydrological to biogeochemical processes using tracer-aided hydrological models in a tropical montane ecosystem

Journal of Hydrology, Journal Year: 2023, Volume and Issue: 619, P. 129328 - 129328

Published: March 3, 2023

Language: Английский

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Progress in understanding the hydrology of high-elevation Andean grasslands under changing land use

The Science of The Total Environment, Journal Year: 2021, Volume and Issue: 804, P. 150112 - 150112

Published: Sept. 4, 2021

Language: Английский

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Low hydrological connectivity after summer drought inhibits DOC export in a forested headwater catchment

Hydrology and earth system sciences, Journal Year: 2021, Volume and Issue: 25(9), P. 5133 - 5151

Published: Sept. 22, 2021

Abstract. Understanding the controls on event-driven dissolved organic carbon (DOC) export is crucial as DOC an important link between terrestrial and aquatic cycles. We hypothesized that topography a key driver of in headwater catchments because it influences hydrological connectivity, which can inhibit or facilitate mobilization. To test this hypothesis, we studied mechanisms controlling mobilization Große Ohe catchment, forested mid-elevation mountainous region southeastern Germany. Discharge stream concentrations were measured at interval 15 min using situ UV-Vis (ultraviolet–visible) spectrometry from June 2018 until October 2020 two topographically contrasting subcatchments same stream. At upper location (888 m above sea level, a.s.l.), drains steep hillslopes, whereas, lower (771 larger area, including flat wide riparian zone. focus four events with antecedent wetness conditions event size. During events, in-stream increased up to 19 mg L−1 comparison 2–3 during baseflow. The concentration–discharge relationships exhibited pronounced but almost exclusively counterclockwise hysteresis loops generally wider catchment than due delayed zone released considerable amounts DOC, led load 7.4 kg h−1. total wetness. found disproportionally high contribution following long dry period. attribute low connectivity drought, inhibited mobilization, especially beginning events. Our data show not only size also strongly influence leading varying subcatchments, depending topography. As frequency prolonged drought periods predicted increase, relative different may change future when will be reduced more often.

Language: Английский

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Frontiers in páramo water resources research: A multidisciplinary assessment

The Science of The Total Environment, Journal Year: 2023, Volume and Issue: 892, P. 164373 - 164373

Published: May 25, 2023

Language: Английский

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A concerted research effort to advance the hydrological understanding of tropical páramos

Hydrological Processes, Journal Year: 2020, Volume and Issue: 34(24), P. 4609 - 4627

Published: Sept. 14, 2020

Abstract Páramos, a neotropical alpine grassland‐peatland biome of the northern Andes and Central America, play an essential role in regional global cycles water, carbon, nutrients. They act as water towers, delivering ecosystem services from high mountains down to Pacific, Caribbean, Amazon regions. Páramos are also widely recognized biodiversity climate change hot spots, yet they threatened by anthropogenic activities environmental changes. Despite their importance for security carbon storage, vulnerability human activities, only three decades ago, páramos were severely understudied. Increasing awareness need hydrological evidence guide sustainable management prompted action generating data filling long‐standing knowledge gaps. This has led remarkably successful increase scientific knowledge, induced strong interaction between scientific, policy, (local) communities. A combination well‐established innovative approaches been applied collection, processing, analysis. In this review, we provide short overview historical development research state hydrometeorology, flux dynamics, impacts, influence extreme events páramos. We then present emerging technologies hydrology resources discuss how converging science policy efforts have leveraged traditional new observational techniques generate base that can support conclude co‐evolution was able successfully cover different spatial temporal scales. Lastly, outline future directions showcase long‐term collection foster responsible conservation towers.

Language: Английский

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End member and Bayesian mixing models consistently indicate near‐surface flowpath dominance in a pristine humid tropical rainforest

Hydrological Processes, Journal Year: 2021, Volume and Issue: 35(4)

Published: April 1, 2021

Abstract The impacts of forest conversion on runoff generation in the tropics have received much interest, but scientific progress is still hampered by challenging fieldwork conditions and limited knowledge about mechanisms. Here, we assessed generation, flow paths water source dynamics a pristine rainforest catchment Costa Rica using end member mixing analysis (EMMA) Bayesian model (MixSIAR). Geochemical tracer data collected over 4‐week field campaign were combined with tritium used to assess potential deeper groundwater pathways perennial stream. streamflow composition was best captured three end‐members, namely throughfall, shallow (5–15 cm) (15–50 soil water. We estimated end‐member contributions main stream two tributaries approaches found good agreement between results obtained from EMMA MixSIAR. system overwhelmingly dominated near‐surface sources, little evidence for older as tritium‐derived baseflow mean transit time 2.0 4.4 years. pathway (median 39% 49% based MixSIAR, respectively), followed (32% 31%) throughfall (25% 19%). had even greater relative (83% 74% tributary A 42% 63% B). Tributary B no detectable deep contribution, reflecting morphology hillslope (steeper slopes, shallower soils lower vegetation density compared A). Despite short sampling associated uncertainties, this study allowed thoroughly mechanisms humid tropical catchment. Our also provide first comparison increasingly models suggest that MixSIAR yield comparable estimates partitioning tropical, volcanic environment.

Language: Английский

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Analysis of Stable Isotopes of Runoff Sources and their Implication in Hydropower Projects, Cases of Study of Manduriacu and Coca River Basins in Northern Ecuador

Published: May 8, 2025

Understanding the contributions of water sources to hydropower is crucial for characterizing hydrological processes in watersheds with limited data and resources. Specifically, these Ecuador are more complex, long-term monitoring limited; hence, estimating runoff challenging. In order unde0.rstand processes, stable isotopes δ¹⁸O δD were analyzed from monthly samples various tributaries draining northern Andean watersheds, encompassing elevations 500 5,897 meters, which contribute generation both projects. The sampling period was August 2017 September 2018. comparative analysis different headwater helps characterize runoff, contributing projects originating glaciers Paramo system. Malo Mashpi Rivers, located Amazon Pacific drainage basins, respectively, do not receive high-elevation water; instead, they represent local sources. These two rivers join downstream included process purposes, despite influencing generation. significant role altitude isotope composition rainfall-runoff waters indicates that Manduriacu predominantly receives paramo systems. Lower elevation govern Coca-Codo Sinclair Hydropower intake project on eastern side. From a management perspective, this research found 95% total energy produced systems came rainforest rainfall during period.

Language: Английский

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Quantifying Riverine Recharge Impacts on Redox Conditions and Arsenic Release in Groundwater Aquifers Along the Red River, Vietnam

Water Resources Research, Journal Year: 2019, Volume and Issue: 55(8), P. 6712 - 6728

Published: July 29, 2019

Abstract Widespread contamination of groundwater with geogenic arsenic is attributed to microbial dissolution arsenic‐bearing iron (oxyhydr)oxides minerals coupled the oxidation organic carbon. The recharge sources an aquifer can influence concentrations by transport dissolved or reactive constituents that affect mobilization. To understand how different contamination—in particular through their on carbon and sulfate cycling—we delineated quantified in affected region around Hanoi, Vietnam. We constrained potential end‐member compositions employed a novel mixing model using ensemble approach apportion sources. Groundwater are controlled dominant source recharge. High prevalent regardless high ammonium levels, indicative matter decomposition, where riverine. In contrast, significant decomposition required generate elevated largely nonriverine. These findings suggest areas riverine recharge, may be efficiently mobilized from surficial environments carried river‐aquifer interfaces into groundwater. groundwaters derived nonriverine areas, significantly more mineralization obtain equivalent levels mobilization within inland sediments. This method broadly applied examine connection between hydrology, geochemistry quality.

Language: Английский

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Wavelet analyses of neural networks based river discharge decomposition

Hydrological Processes, Journal Year: 2020, Volume and Issue: unknown

Published: Feb. 13, 2020

The problem of discharge forecasting using precipitation as input is still very active in Hydrology, and has a plethora approaches to its solution. But, when the objective simulate values without considering phenomenology behind processes involved, Artificial Neural Networks, ANN give good results. However, question how black box internally solve this remains open. In research, classical rainfall-runoff approached that total sum components hydrological system, which from perspective translated three signals related fast, middle slow flow. Thus, present study two aims (a) time-frequency representation by an hydrologic model (b) capabilities additively decompose river discharge. This adds knowledge open physical interpretability black-box models, limited. results show adequately simulated time frequency domain, although less power spectrum evident during rainy seasons model, due fast flow underestimation. wavelet represents well slow, system with transit times 256, 12–64 2–12 days, respectively. Interestingly, these are remarkably similar those soil water reservoirs studied small headwater catchment tropical Andes. result needs further research because it opens possibility determining MMT on fraction cost isotopic based methods. cross-power indicates error more misrepresentation components, despite limitations recharge period component. With respect individual flows neurons were uncapable individually represent such flows. combination pairs resemble dynamics spectral content aforementioned signals. These some evidence signal processing techniques may be used infer information about functioning basin.

Language: Английский

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Hillslope and groundwater contributions to streamflow in a Rocky Mountain watershed underlain by glacial till and fractured sedimentary bedrock

Hydrology and earth system sciences, Journal Year: 2021, Volume and Issue: 25(1), P. 237 - 255

Published: Jan. 15, 2021

Abstract. Permeable sedimentary bedrock overlain by glacial till leads to large storage capacities and complex subsurface flow pathways in the Canadian Rocky Mountain region. While some inferences on release of water can be drawn from conceptualizations runoff generation (e.g., thresholds hydrologic connectivity) physically similar watersheds, relatively little research has been conducted snow-dominated watersheds with multilayered permeable substrates that are characteristic Mountains. Stream source (rain, snowmelt, soil water, hillslope groundwater, groundwater) were sampled four sub-watersheds (Star West Lower, Star Upper, East Upper) Creek, SW Alberta, characterize spatial temporal variation contributions streamflow upper lower reaches this watershed. Principal component analysis was used determine relative dominance timing over 2014 2015 seasons. An initial displacement stored winter (reacted rather than unreacted snowmelt rainfall) occurred at onset before stream discharge responded significantly. This followed a dilution effect as saturated landscape, recharged connected hillslopes stream. Fall baseflows dominated either riparian or groundwater West. Conversely, East, composition August but plotted outside boundary measured sources September October. The chemical seeps same trend consistently cold temperatures suggested deep likely late fall streamflow. Temperature signatures also suggest highly pathways. insights gained help improve our understanding processes which is released structures.

Language: Английский

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