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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Soil–vegetation–water interactions controlling solute flow and chemical weathering in volcanic ash soils of the high Andes

Hydrology and earth system sciences, Journal Year: 2023, Volume and Issue: 27(7), P. 1507 - 1529

Published: April 11, 2023

Abstract. Vegetation plays a key role in the hydrological and biogeochemical cycles. It can influence soil water fluxes transport, which are critical for chemical weathering development. In this study, we investigated balance solute two profiles with different vegetation types (cushion-forming plants vs. tussock grasses) high Ecuadorian Andes by measuring content, flux, concentrations modeling hydrology. We also analyzed of weathering. The on is restricted to A horizon. Evapotranspiration 1.7 times higher deep drainage 3 lower under cushion-forming than grass. Likewise, cushions transmit about 2-fold less from horizons. This attributed retention saturated hydraulic conductivity associated shallower coarser root system. Under plants, dissolved organic carbon (DOC) metals (Al, Fe) mobilized Solute that be related plant nutrient uptake (Mg, Ca, K) decline depth, as expected biocycling nutrients. Dissolved silica bicarbonate minimally influenced represent largest contributions fluxes. Soil constant depth below grasses but declining plants. difference mainly Our findings reveal modify properties uppermost horizon, altering balance, fluxes, throughout profile.

Language: Английский

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The role of peat-forming bofedales in sustaining baseflow in the humid puna

Journal of Hydrology Regional Studies, Journal Year: 2023, Volume and Issue: 47, P. 101394 - 101394

Published: May 16, 2023

Humid puna of the Central Andes, Perú Bofedales, or peat-forming wetlands, are a characteristic feature humid - high elevation, seasonally dry grass- and shrub-land throughout Andes. Despite hydrologic importance for downstream communities, inference that bofedales play an important role, few studies have explored hydrology this ecosystem, none quantified bofedal water yield to streams. We designed 3-year study in Upper Ramuschaka Watershed (URW), 2.12 km2 catchment sustaining perennial stream used irrigation downstream. monitored fluxes through URW, periodically measured discharge 19 nested subbasins across wet seasons, characterized structure, hydraulic properties, storage capacity four bofedales. Unit runoff is consistently higher with greater coverage. High porosity peat fills season via groundwater recharge drains slowly underlying layers low conductivity. Bofedales cover 11.6% URW store 105,000 ± 10,000 m3 seasonally. In season, 49 5 mm streams, equivalent 20 – 98% URW's runoff. regulate drainage from communities therefore vital local regional security.

Language: Английский

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Ecohydrological assessment of the water balance of the world's highest elevation tropical forest (Polylepis)

The Science of The Total Environment, Journal Year: 2024, Volume and Issue: 941, P. 173671 - 173671

Published: May 31, 2024

Language: Английский

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The seasonal origins and ages of water provisioning streams and trees in a tropical montane cloud forest

Hydrology and earth system sciences, Journal Year: 2023, Volume and Issue: 27(22), P. 4173 - 4186

Published: Nov. 21, 2023

Abstract. Determining the sources of water provisioning streams, soils, and vegetation can provide important insights into that sustains critical ecosystem functions now how those may be expected to respond given projected changes in global hydrologic cycle. We developed multi-year time series isotope ratios (δ18O δ2H) based on twice-monthly collections precipitation, lysimeter, tree branch xylem waters from a seasonally dry tropical montane cloud forest southeastern Andes mountains Peru. then used this information determine indices seasonal origins, young fractions (Fyw), new (Fnew) soil, stream, water. There was no evidence for intra-annual variation origins stream lysimeter 1 m depth, both which were predominantly comprised wet-season precipitation even during seasons. However, demonstrated an shift origin: wet season dry-season season. The (< 15 %) (5 lower than fraction (37 waters. (an indicator ≤ 2 weeks old study) estimated 12 % waters, while there significant or depth. Our results indicate source trees system varied seasonally, such recent more immediately taken up by shallow roots. In comparison, soils streams did not vary mix reside take longer transit stream. ages humid add understanding mechanisms govern partitioning moving through different ecosystems.

Language: Английский

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Soil Moisture Forecast Using Transfer Learning: An Application in the High Tropical Andes

Water, Journal Year: 2024, Volume and Issue: 16(6), P. 832 - 832

Published: March 13, 2024

Soil moisture is a critical variable in the hydrological cycle and climate system, significantly impacting water resources, ecosystem functioning, occurrence of extreme events. However, soil data are often scarce, dynamics not fully understood mountainous regions such as tropical Andes Ecuador. This study aims to model predict using situ-collected hydrometeorological for training data-driven machine-learning techniques. Our results highlight fundamental role vegetation controlling significant differences balance related types topography. A baseline was developed neural network Subsequently, by employing transfer-learning techniques, this effectively applied different horizons profiles, demonstrating its generalization capacity adaptability. The use schemes knowledge transfer techniques allowed us develop predictive models trained on data. technique, which leveraged from pre-trained with similar domain, yielded errors order 1×10−6<ϵ<1×10−3. For data, forecast base demonstrated excellent results, lowest magnitude error metric RMSE equal 4.77×10−6, NSE KGE both 0.97. These show promising potential accurately short-term applications natural hazard monitoring regions.

Language: Английский

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Bofedal wetland and glacial melt contributions to dry season streamflow in a high‐Andean headwater watershed

Hydrological Processes, Journal Year: 2024, Volume and Issue: 38(8)

Published: Aug. 1, 2024

Abstract In the context of expected future melt reductions in high‐Andes, buffering capacity non‐glacial stores, and especially high‐altitude bofedal wetlands, is increasing importance. Isotope signatures potentially indicative water undergoing evaporation on transit through bofedales have been found tropics, but end‐member uncertainty has so far prevented streamflow separation using this signal. We undertook a stable isotope sampling campaign over 2022 wet‐dry season transition 53.6 km 2 , 16% glacierized catchment southern Peru with coverage 11%. Diurnal proglacial hydrographs remote sensing were used to interpret seasonal snowmelt dynamics identify dry periods when glacial contributions are assessed be two principal components streamflow. Following final wet precipitation event, rapid ~3 week occurs main river from signature consistent dynamic rainfall/snowmelt one ice‐melt. both seasons, tributary streams show evaporative enrichment suggesting ongoing supply transiting bofedales. A two‐component mixing model lc‐excess during shows source contribution varies 9% 20% [±9–10%], indicating that greatly augmented by presence glaciers at these headwater scales. However, applying proportions discharge sustained around 0.09 m 3 /s study window whereas flux halves 0.73 0.36 timeframe. The results highlight important role connected groundwater system declines months into season, suggests hydrological functioning as part wider should considered exploring effectiveness potential options sustain baseflows post‐glacial future.

Language: Английский

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Preface special issue: “Processes and patterns in tropical hydrology”

Hydrological Processes, Journal Year: 2023, Volume and Issue: 37(7)

Published: July 1, 2023

This is the preface to an SI.

Language: Английский

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