Improving the hydrological consistency of a process-based solute-transport model by simultaneous calibration of streamflow and stream concentrations

Hydrology and earth system sciences, Год журнала: 2025, Номер 29(1), С. 127 - 158

Опубликована: Янв. 14, 2025

Abstract. The consistency of hydrological models, i.e. their ability to reproduce observed system dynamics, needs be improved increase predictive power. As using streamflow data alone calibrate models is not sufficient constrain them and render consistent, other strategies must considered, in particular additional types data. aim this study was test whether simultaneous calibration dissolved organic carbon (DOC) nitrate (NO3-) concentrations along with the a parsimonious solute-transport model. A multi-objective approach four scenarios used evaluate model's predictions for an intensive agricultural headwater catchment. After calibration, model reasonably simultaneously reproduced dynamics discharge DOC NO3- stream catchment from 2008–2016. Evaluation independent datasets indicated that usually groundwater level soil moisture upslope riparian zones correctly all scenarios. Using daily did improve its predict or evaluation periods. significantly representation storage lesser extent zone but zone. Parameter uncertainty decreased when calibrated solute concentrations, except parameters related fast slow reservoir flow. This shows added value multiple streamflow, internal states flows. With increasing availability monitoring, provides objective way can confidence

Язык: Английский

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The Observed Isotopic Errors in Extreme Precipitation Leads to Overestimation of Long‐Term Soil‐Streamflow Hydrological Connectivity

Hydrological Processes, Год журнала: 2025, Номер 39(4)

Опубликована: Апрель 1, 2025

ABSTRACT The tracer‐aided modelling has gained widespread attention in recent years as a crucial approach for investigating watershed hydrological functions. However, errors model inputs, such precipitation, evapotranspiration (ET) and isotopes can lead to uncertainty physically meaningful parameters, which, turn, affects the accurate depiction of In this study, we focused on Hemuqiao watershed, typical humid mountainous region southeast China, equipped with intensive isotopic monitoring. Two Reservoirs StorAge Selection (TRSAS) was adopted explore impact input data understanding connectivity preferential flow. results show that observation precipitation ET do not significantly reduce performance (with optimal NSE value decreasing by up 0.05). they increase simulation primarily due associated large events. contrast, observed particularly during extreme events, meanwhile significant differences some parameters compared no error data. Although proportion young water fraction streamflow does noticeable difference, proportions lateral subsurface flow tend be overestimated (i.e., approximately 0.14 0.08, respectively, average over long term). This an overestimation between soil streamflow. These findings suggest models, improving accuracy is more critical accurately processes than enhancing spatial observations ET.

Язык: Английский

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Remote sensing-aided rainfall–runoff modeling in the tropics of Costa Rica

Hydrology and earth system sciences, Год журнала: 2022, Номер 26(4), С. 975 - 999

Опубликована: Фев. 21, 2022

Abstract. Streamflow simulation across the tropics is limited by lack of data to calibrate and validate large-scale hydrological models. Here, we applied process-based, conceptual HYPE (Hydrological Predictions for Environment) model quantitatively assess Costa Rica's water resources at a national scale. Data scarcity was compensated using adjusted global topography remotely sensed climate products force, calibrate, independently evaluate model. We used temperature product bias-corrected precipitation from Climate Hazards Group InfraRed Precipitation with Station (CHIRPS) as forcings. Daily streamflow 13 gauges period 1990–2003 monthly Moderate Resolution Imaging Spectroradiometer (MODIS) potential evapotranspiration (PET) actual (AET) 2000–2014 were applying four different configurations (M1, M2, M3, M4). The calibration consisted step-wise parameter constraints preserving best sets previous simulations in an attempt balance variable availability time periods. evaluated signatures such baseflow index, runoff coefficient, aridity among others. Results suggested that two-step daily (M2) better option than calibrating only (M1), similar mean Kling–Gupta efficiency (KGE ∼ 0.53) series, but improvements reproduce flow duration curves, median root squared error (RMSE) 0.42 M2 RMSE 1.15 M1. Additionally, including AET (M3 M4) statistically improved simulated matched signatures, KGE 0.49 M3–M4, comparison M1–M2 < 0.3. Furthermore, Kruskal–Wallis Mann–Whitney statistical tests support performance M3 M4, suggesting PET-AET (M3) represents appropriate sequence regional modeling. Such has be operationally humid informing decision-making relatively high spatial temporal resolution.

Язык: Английский

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Small-scale topography explains patterns and dynamics of dissolved organic carbon exports from the riparian zone of a temperate, forested catchment

Hydrology and earth system sciences, Год журнала: 2021, Номер 25(12), С. 6067 - 6086

Опубликована: Ноя. 30, 2021

Abstract. Export of dissolved organic carbon (DOC) from riparian zones (RZs) is an important component temperate catchment budgets, but export mechanisms are still poorly understood. Here we show that DOC predominantly controlled by the microtopography RZ (lateral variability) and groundwater level dynamics (temporal variability). From February 2017 until July 2019 studied topography, quality water fluxes pathways in a small forested receiving stream central Germany. The chemical classification surface samples (n=66) Fourier transform ion cyclotron resonance mass spectrometry revealed cluster plant-derived, aromatic oxygen-rich with high concentrations (DOCI) microbially processed, saturated heteroatom-enriched lower (DOCII). two clusters were connected to locations distinctly different values high-resolution topographic wetness index (TWIHR; at 1 m resolution) within study area. Numerical flow modeling using integrated surface–subsurface model HydroGeoSphere runoff high-TWIHR associated DOCI (DOCI source zones) dominated overall discharge generation therefore export. Although corresponding only 15 % area RZ, contributed 1.5 times remaining 85 DOCII zones. Accordingly, sampled under five event conditions (n=73) was closely reflecting quality. Our results suggest along dynamically evolving networks can play dominant role for exports RZs low relief should consequently be considered catchment-scale models. We propose proxies spatial heterogeneity such as TWIHR help delineate most active provide mechanistic basis improved conceptualization exports.

Язык: Английский

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Is a simple model based on two mixing reservoirs able to reproduce the intra-annual dynamics of DOC and NO3 stream concentrations in an agricultural headwater catchment?

The Science of The Total Environment, Год журнала: 2021, Номер 794, С. 148715 - 148715

Опубликована: Июнь 26, 2021

Язык: Английский

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Soil organic carbon mobility in equatorial podzols: soil column experiments

SOIL, Год журнала: 2021, Номер 7(2), С. 585 - 594

Опубликована: Сен. 6, 2021

Abstract. Transfer of organic carbon from topsoil horizons to deeper and the water table is still little documented, in particular equatorial environments, despite high primary productivity evergreen forest. Due its complexing capacity, also plays a key role transfer metals soil profile and, therefore, pedogenesis for metal mobility. Here we focus on podzols, which are known play an important cycling. We carried out column experiments using material percolating solution sampled Amazonian podzol area order better constrain conditions at depth. The dissolved matter (DOM) produced was not able percolate through clayey, kaolinitic deep retained it. When it previously percolated Bh material, there production fulvic-like, protein-like compounds small carboxylic acids clayey increase mobility Al, Fe Si. Podzolic processes can, produce DOM likely be transferred table, playing balances scale owing horizon weathering. magnitude concentration depth around 1.5–2.5 mg L−1. Our findings reveal fundamental mechanism that favors formation very thick saprolites.

Язык: Английский

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Do mixing models with different input requirement yield similar streamflow source contributions? Case study: A tropical montane catchment

Hydrological Processes, Год журнала: 2021, Номер 35(6)

Опубликована: Май 9, 2021

Abstract Hydrogeochemical based mixing models have been successfully used to investigate the composition and source identification of streamflow. The applicability these is limited due high costs associated with data collection hydrogeochemical analysis water samples. Fortunately, a variety exist, requiting different amount as input, in scarce regions it likely that preference will be given lowest requirement input data. An unanswered question if or low are equally accurate. To this end, performance two requirement, model (MMA) end‐member (EMMA), were verified on tropical montane headwater catchment (21.7 km 2 ) Ecuadorian Andes. Nineteen tracers measured samples collected weekly during 3 years streamflow eight potential sources end‐members (precipitation, lake water, soil from horizons springs). Results 6 conservative tracers, revealed EMMA (using all tracers) MMA pair‐combinations out ones), identified same end‐members: rainfall, spring water., well as, similar contribution fractions rainfall 21.9% 21.4%, 52.7% 52.3%, 26.1% 28.7%, respectively. Our findings show requiring few can provide outcomes than demanding more This underlines value preliminary detailed characterization basis derive most cost‐efficient monitoring strategy.

Язык: Английский

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Effects of passive-storage conceptualization on modeling hydrological function and isotope dynamics in the flow system of a cockpit karst landscape

Hydrology and earth system sciences, Год журнала: 2022, Номер 26(21), С. 5515 - 5534

Опубликована: Ноя. 7, 2022

Abstract. Conceptualizing passive storage in coupled flow–isotope models can improve the simulation of mixing and attenuation effects on tracer transport many natural systems, such as catchments or rivers. However, effectiveness incorporating different conceptualizations complex karst flow systems remains poorly understood. In this study, we developed a model that conceptualizes both “fast-flow” “slow-flow” processes heterogeneous aquifers well hydrological connections between steep hillslopes low-lying depression units cockpit landscapes. The tested contrasting configurations fast- slow-flow was optimized using multi-objective optimization algorithm based detailed observational data discharge isotope dynamics Chenqi Catchment southwestern China. Results show one to three passive-storage zones distributed hillslope fast-/slow-flow reservoirs and/or provided optimal structures study catchment. This effectively accuracy for outlet signatures. Additionally, tracer-aided reflects dominant paths units, yielding reasonable source area apportionment components (e.g., more than ∼ 80 % fast total discharge) solute unit systems. Our provides novel, flexible tool realistic catchment easily be transferred other catchments.

Язык: Английский

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Can temperature be a low-cost tracer for modelling water age distributions in a karst catchment?

Journal of Hydrology, Год журнала: 2024, Номер unknown, С. 131947 - 131947

Опубликована: Сен. 1, 2024

Язык: Английский

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Seasonal Wetlands Make a Relatively Limited Contribution to the Dissolved Carbon Pool of a Lowland Headwater Tropical Stream

Journal of Geophysical Research Biogeosciences, Год журнала: 2024, Номер 129(2)

Опубликована: Фев. 1, 2024

Abstract Wetlands process large amounts of carbon (C) that can be exported laterally to streams and rivers. However, our understanding wetland inputs remains unclear, particularly in tropical systems. Here we estimated the contribution seasonal wetlands C pool a lowland headwater stream Australian tropics. We measured dissolved organic inorganic (DOC DIC) gases (carbon dioxide—CO 2 , methane—CH 4 ) during wet season along mainstem drains connected stream. also recorded hourly measurements CO ‘stream–wetland drain–stream’ continuum, used hydrological model combined with simple mass balance approach assess water, DIC DOC sources Seasonal contributed ∼15% ∼16% loads synoptic sampling, slightly higher than percent area (∼9%) they occupy catchment. The riparian forest (75% load) groundwater inflows (58% were identified as main DIC. marginally CH . Importantly, rates emission (1.86 g s −1 mineralization (0.33 much lower downstream export (6.39 (2.66 ). This work highlights need for further research on role corridors producers conduits terrestrial streams.

Язык: Английский

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