Slow and Quick Flow Models Explain the Temporal Dynamics of Daily Salinity in Streams

Water Resources Research, Год журнала: 2025, Номер 61(6)

Опубликована: Июнь 1, 2025

Abstract The availability of long‐term high‐frequency water quality data sets provides an opportunity to investigate transport pathways within catchments. simple “C‐Q” log‐regression equation is commonly used the relationship between concentrations and streamflow. However, significant variability can result in poor explanation temporal dynamics using C‐Q equation. equations with multiple flow components may better capture these dynamics, but they often only provide empirical interpretations require subjective procedures partition Here, we aim improve simulation over time by evaluating existing newly derived quick‐slow equations. We derive eight evaluate their performance along seven are applied 20 years daily salinity records 23 catchments Victoria, Australia. evidence ratio identifies our version Hubbard Brook as most acceptable at 14 a mixing model that explains in‐stream function volumes subsurface, differs additional slower volume. Compared equation, this explained average increase 0.17 Nash‐Sutcliffe efficiency coefficient. Global parameter estimation gave objective estimate baseflow plausible index ranging 0.05 0.40 across modified basis for further examining

Язык: Английский

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Changes in the flowing drainage network and stream chemistry during rainfall events for two pre-Alpine catchments

Hydrology and earth system sciences, Год журнала: 2025, Номер 29(11), С. 2339 - 2359

Опубликована: Июнь 4, 2025

Abstract. Many headwater catchments contain non-perennial streams that flow only during wet conditions or in response to rainfall events. The onset and cessation of result a dynamic stream network periodically expands contracts. can flush sediment nutrients from previously dry streambeds enhance the rates carbon nitrogen mineralization. expansion flowing drainage also increases hydrologic connectivity between hillslopes because it decreases travel distances stream. However, datasets on dynamics short-term changes chemistry events are rare. This limits our interpretation hydrological processes Here, we present hourly measurements solute concentrations stable isotopes precipitation streamflow at outlets two 5 ha Swiss pre-Alpine region seven rainfall–runoff snow-free season 2021. Samples were collected soil water groundwater across catchments. We combine these data with 10 min information length infer dominant runoff-generating mechanisms for experimental Despite their proximity similar size, soil, bedrock characteristics, very different In flatter catchment (average slope 15°), was more expanded rapidly, up 10-fold, while steeper 24°), remained relatively (only 2-fold change). event contributions higher catchment. dilution calcium time rapid increase discharge suggested contribution falling directly channels is important, especially smaller conditions. During conditions, must have been delivered areas outside channels. network, “flush” nitrate detectable, possibly due transport material segments. characterized by such not observed, decreased, suggesting larger riparian reducing Our study highlights large differences chemical responses neighboring but shows value fine-scale observations both channel understand runoff-generation mechanisms.

Язык: Английский

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Landscape spatial configuration influences phosphorus but not nitrate concentrations in agricultural headwater catchments

Hydrological Processes, Год журнала: 2023, Номер 37(2)

Опубликована: Янв. 24, 2023

Abstract Landscape organized (or structured) heterogeneity influences hydrological and biogeochemical patterns across space time. We developed landscape indices that describe the spatial configuration of nutrient sources sinks as a function their distance to stream (lateral dimension) or outlet (longitudinal intersection with flow‐accumulation areas. Using monthly nitrate, total phosphorus (TP), soluble reactive (SRP) daily discharge (Q) data from 221 rural catchments (1–300 km 2 ) 2010–2020, we observed higher variability in flow‐weighted mean concentrations smaller than larger ones. The configurations also decreased increasing catchment size. A index, calculated arable land use weighted by on flow accumulation, improved prediction TP SRP, but not compared unweighted use. conclude transfer more nitrate transfer, zones riparian areas are critical source for respectively. By contrast, lateral (upslope–downslope) longitudinal (upstream–downstream) dimensions did have an identifiable influence nutrients temporal dynamics. this study can help design landscapes minimize diffuse losses streams show management is first order control losses.

Язык: Английский

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Connecting forest soil properties with ecosystem services: Toward a better use of digital soil maps—A review

Soil Science Society of America Journal, Год журнала: 2024, Номер 88(4), С. 981 - 999

Опубликована: Июнь 7, 2024

Abstract The soil supports many ecosystem services (ES) essential to human well‐being. Rapid developments in digital mapping (DSM) allow the of types and properties with improved resolution accuracy. However, potential DSM improve assessment ES is not fully exploited. To better understand this potential, we synthesized peer‐reviewed literature. We examined what empirical studies reveal about role four major provided by forest: (I) timber production, (II) carbon storage, (III) regulation water flow provision clean water, (IV) as a habitat for organisms. Results revealed that are strongly related ES. Therefore, using could greatly forests. Several variables were specific regardless region or types, but others found be situation‐specific (climate type) need considered at proper scale within land classification framework. products have turning qualitative relationships between quantitative ones. This also lead discovery new soil–ES relationships. For realized, progress should made most crucial parameters greater precision promoting use assessment.

Язык: Английский

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Ecological regulation of chemical weathering recorded in rivers

Earth and Planetary Science Letters, Год журнала: 2024, Номер 641, С. 118800 - 118800

Опубликована: Июнь 4, 2024

We provide a new generalized framework accounting for the effects of water and nutrient uptake by roots in weathering zone on broad patterns solute concentration - discharge relationships rivers. As plants withdraw from subsurface, they decrease area-normalized fluid drainage rate. This results flux to springs streams which is function use plants, leading ecosystem regulation characteristic timescales chemical reactions flow Our predictive quantifies pore river chemistry generated water-rock interactions, regulated vegetation rates. To this we add capacity enrich, passively admit, or discriminate against given dissolved based ecophysiological needs, thus further modifying local species solution across profile. not lost atmosphere same manner as removed subsurface via evapotranspiration. Rather, these extracted become incorporated into topsoil litter may be partially fully resolubilized, creating an upper boundary condition depends recycling characteristics ecosystem. These processes are united through advection-reaction equation allows regulate stream relationships. show that ecosystems capable both accelerating impeding reaction rates profile, ultimately thermodynamic ecological controls baseflow rock-derived solutes

Язык: Английский

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