Seasonal and Inter‐Annual Dynamics in Water Quality and Stream Metabolism in a Beaver‐Impacted Drought‐Sensitive Lowland Catchment

Hydrological Processes, Journal Year: 2025, Volume and Issue: 39(2)

Published: Feb. 1, 2025

ABSTRACT Increasing drought frequency and severity from climate change are causing streamflow to become increasingly intermittent in many areas. This has implications for the spatio‐temporal characteristics of water quality regimes which need be understood terms risks provision clean public supplies instream habitats. Recent advances sensor technology allow reliable accurate high‐resolution monitoring a growing number parameters. Here, we continuously monitored suite parameters over 3 years an stream network eutrophic, lowland Demnitzer Millcreek catchment, Germany. We focused on effects wetland systems impacted by beaver dams diurnal, seasonal inter‐annual variation dynamics at two sites, upstream downstream these wetlands. then used data model metabolism. Dissolved oxygen pH were higher wetlands, while conductivity, turbidity, chlorophyll phosphorous concentrations downstream. found clear diurnal cycling dissolved both sites. These correlated with hydroclimatic changes metabolism, becoming pronounced as temperatures increased flows decreased spring summer. Upstream wetlands this corresponded rapidly heterotrophic modelled Gross Primary Production (GPP) was exceeded Ecosystem Respiration (ER). Downstream, where GPP lower, usually strongly prone hypoxic conditions (i.e., insufficient oxygen) before ceased coincided lower velocities deeper channels Seasonal variations mainly correlate factors (particularly temperature) their influence streamflow. study highlights that heterotrophy hypoxia rivers central Europe is important feature streams agricultural landscapes continue leaching nutrients. insights contribute evidence base understanding how will affect quantity rural resources presence beavers requires management responses.

Language: Английский

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Quantification of Carbopeaking and CO2 ${\text{CO}}_{2}$ Fluxes in a Regulated Alpine River

Water Resources Research, Journal Year: 2025, Volume and Issue: 61(2)

Published: Feb. 1, 2025

Abstract Carbon dioxide () fluxes in regulated Alpine rivers are driven by multiple biogeochemical and anthropogenic processes, acting on different spatiotemporal scales. We quantified the relative importance of these drivers their effects dynamics concentration atmospheric exchange a representative river segment cascading hydropower system with diversion, which includes two residual flow reaches reach subject to hydropeaking. combined instantaneous time‐resolved water chemistry hydraulic measurements at times year, main calibrating one‐dimensional transport‐reaction model measured data. As novelty compared previous inverse modeling applications, also included carbonate buffering, contributed significantly budget case study. The distribution depended operations. Along reaches, were directly affected upstream dams only first 2.5 km, where supply supersaturated from reservoirs was predominant. Downstream diversion outlets, dominated systematic sub‐daily fluctuations transport evasion (“carbopeaking”) Hydropower operational patterns regulation approaches affect response across temporal Our findings highlight considering all scales variations for accurate quantification understanding impacts, clarify role natural global carbon cycling.

Language: Английский

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Controls of methane oxidation in dry streambeds

Limnetica, Journal Year: 2025, Volume and Issue: 45(1), P. 1 - 1

Published: May 14, 2025

Despite advances in understanding methane dynamics dry inland waters, the potential of riverbeds to act as sinks methane, soils do, and controlling factors remain unclear. Here, we tested three main oxidation freshwater ecosystems sediments from a riverbed (decreasing modulation degree): gravimetric water content (GWC), temperature, light quality intensity. We measured rates (PMO) along gradient GWC (1%, 5%, 8%, 10%, 100%), temperature (10 ºC, 20 30 ºC) (in darkness, at photosynthesis-limiting (i.e., green) photosynthesis-promoting grow) light). Our results revealed that streambed have oxidize methane. GWC, major factor, followed nonmonotonic function, with highest PMO around 5% GWC. As secondary control, affected sediment only but not 100% sediment. was lowest 10 ºC above ºC. Interestingly, reduced by 3–6× compared dark conditions, grow ~2× green light. indicate there will be day–night seasonal variations function light, between reaches, depending on canopy cover associated shading. Overall, our highlight atmosphere.

Language: Английский

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Divergent drivers of the spatial variation in greenhouse gas concentrations and fluxes along the Rhine River and the Mittelland Canal in Germany

Environmental Science and Pollution Research, Journal Year: 2024, Volume and Issue: 31(22), P. 32183 - 32199

Published: April 22, 2024

Lotic ecosystems are sources of greenhouse gases (GHGs) to the atmosphere, but their emissions uncertain due longitudinal GHG heterogeneities associated with point source pollution from anthropogenic activities. In this study, we quantified summer concentrations and fluxes carbon dioxide (CO

Language: Английский

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Water stagnancy and wastewater input enhance primary productivity in an engineered river system

River, Journal Year: 2024, Volume and Issue: 3(2), P. 191 - 198

Published: May 1, 2024

Abstract Under warming conditions and with increasing human perturbations, rivers across the globe are facing drastic shifts in their hydrologic regime, resulting fragmentation disconnection from catchment. Subsequently, a dependency on situ primary productivity as source of organic matter increases warrants detailed investigation nature production urbanized river systems. In this study, was estimated at multiple locations along continuum an engineered (Sabarmati) free flowing (Mahi) systems India using 13 C tracer incubation method. Significantly enhanced riverfront (engineered construction Sabarmati that holds water supplied by canal) polluted downstream compared to Mahi observed. It also observed stagnancy, temperature, nutrient availability were key factors regulating rates urban system. The study highlights salient features riverine associated modifications, which needs be considered for future development projects.

Language: Английский

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Characteristics and influencing factors of greenhouse gas emissions from reservoirs in the Yellow River Basin: A Meta-analysis

Science China Earth Sciences, Journal Year: 2024, Volume and Issue: 67(7), P. 2210 - 2225

Published: June 12, 2024

Language: Английский

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黄河流域水库温室气体排放特征及影响因素——Meta分析

SCIENTIA SINICA Terrae, Journal Year: 2024, Volume and Issue: unknown

Published: Feb. 1, 2024

水库建设与运行深刻改变河流的水文水动力及碳氮循环过程,然而当前研究仍缺乏对干旱/半干旱区域水库温室气体排放特征的系统揭示。本文通过对现有监测数据进行系统整合,探讨了黄河流域水库温室气体的总体排放特征,明晰了水库温室气体排放的控制因子及影响机制。研究表明,黄河流域水库CO₂排放通量低于河道,但CH₄和N₂O的排放通量却分别是河道的1.9倍和10倍,表明辐射效应更强的温室气体在水库的排放显著加强。与湿润地区相比,黄河流域水库的低有机质浓度导致CO₂和CH₄排放相对较低,但高氮负荷造成N₂O排放显著高于湿润地区水库。针对237座黄河流域水库的蒙特卡洛模拟结果显示,三种温室气体排放当量总量为3.05Tg CO₂-eq yr^-1,约占全球水库总排放当量的0.39%,低于流域陆地面积占比(0.53%)。本研究对揭示全球干旱/半干旱区域水库温室气体的排放特征及控制机制具有重要引导意义。

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Understanding hydrological connectivity: an empirical study of river-aquifer interaction across Brazil

Published: March 26, 2024

which played a crucial role in facilitating significant portion of this study.Additionally, I also owe thanks to the São Carlos School Engineering (EESC/USP) for awarding me scholarship from Teaching Improvement Program (PAE), without completion master's project would not have been possible.I

Language: Английский

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Synthesis reveals heterogeneous changes in the metabolism and emission of greenhouse gases of drying rivers

Environmental Research Letters, Journal Year: 2024, Volume and Issue: 19(11), P. 113002 - 113002

Published: Sept. 9, 2024

Abstract More than half of the world’s rivers experience occasional, seasonal, or permanent drying, and this may increase because climate change. Drying, i.e. severe reduction in water flow even leading to streambed desiccation, can have a profound impact on available aquatic habitat, biodiversity, functions rivers. Yet, date, it is unclear whether similar drying events comparable zones result changes ecosystem processes, such as river metabolism greenhouse gas (GHG) emissions. Here, we synthesise detected effects gross primary production (GPP) respiration (ER), well emissions GHGs (CO 2 , CH 4 N O) streams. We examined current scientific literature detailing these variables when measured either field laboratory. extracted data from 30 studies analysing GPP ER responses, GHG another 35 studies. Then, conducted meta-analysis determine magnitude direction varied across systems studied, according type (natural human-induced) severity drying. In general, enhanced (under low flows) emissions, decreased CO O The hydrological phases throughout (low flow, isolated pools, desiccation) had differential were generally more induced rather just periods flow. Desiccation strongly reduced GPP, likely die-off algae, while its negative effect was smaller. Greater decrease under desiccation would lead emissions; our results showed accordingly that increased Furthermore, depending study type. Experimental micro- mesocosms demonstrated greater studies, thus extrapolation real conditions should be done with caution. Overall, effects’ inconsistent zones, except for Mediterranean zone, where showing both Our synthesis contribute identifying worldwide trends patterns riverine associated global change impacts stream ecosystems.

Language: Английский

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River Damming Impacts on Carbon Emissions Should Be Revisited in the Context of the Aquatic Continuum Concept

Environmental Science & Technology, Journal Year: 2024, Volume and Issue: unknown

Published: Sept. 25, 2024

Language: Английский

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