Dam-induced impacts on the water temperature of the Charef River (north-eastern Algeria)

Marine and Freshwater Research, Год журнала: 2025, Номер 76(2)

Опубликована: Янв. 29, 2025

Context Dams construction appears to have multi-dimensional effects on the river environment, and it especially affects thermal condition of rivers. Aims The objective this work was assess downstream responses Charef Dam in relation water flow residence time. Methods During year 2012, hydrological parameters upstream dam were monitored. Key results Salinity, electrical conductivity, total dissolved solids (TDS) all responded similarly, with larger magnitudes waters than downstream, whatever season. In terms flux, retains 59 56% incoming TDS fluxes respectively. Furthermore, temperature is higher that 83% samples. dry season, response can exceed 2°C (downstream cooling). Conclusions Despite being a small dam, time (2.3 years) has significant effect temperature. Implications These changes may cause physicochemical biological issues. Restoration practices such as increasing discharges during seasons riparian cover restoration could mitigate impacts minimise negative effects.

Язык: Английский

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Climate and biological factors jointly shape microbial community structure in the Yarlung Zangbo River during the dry season

The Science of The Total Environment, Год журнала: 2025, Номер 969, С. 178930 - 178930

Опубликована: Фев. 27, 2025

Язык: Английский

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Role of hydraulic residence time in shaping phytoplankton community assembly in the upper yellow river cascade reservoirs

Frontiers in Environmental Science, Год журнала: 2025, Номер 13

Опубликована: Апрель 9, 2025

Introduction: Cascade hydropower development significantly alters the structure and function of river ecosystems. Phytoplankton, as primary producers, are highly sensitive to environmental changes, their diversity community reflect state water environment. While there is extensive research on how changes in environments affect phytoplankton structure, studies spatial distribution patterns assembly mechanisms relation hydraulic residence time (HRT)—a key characteristic reservoirs—are limited. Methods: Linear regression analysis was used examine relationship between communities HRT. Additionally, Neutral Community Model (NCM) combined with Modified Stochasticity Ratio (MST) employed reveal types these cascade reservoirs. Finally, Mantel tests stepwise assessed specific impacts factors communities. Results: In ecosystem Yellow River reservoirs, HRT positively correlated abundance across different seasons. annual regulation stations (LJX LYX), species richness, abundance, indices higher compared those runoff stations. Discussion: The primarily driven by deterministic processes, station being more influenced processes than station. HRT, temperature (WT), total nitrogen (TN) most significant affecting structural differences There a positive correlation temperature, especially short where impacted temperature.

Язык: Английский

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Leaky Dams as Nature-Based Solutions in Flood Management Part II: Mechanisms, Effectiveness, Environmental Impacts, Technical Challenges, and Emerging Trends

Hydrology, Год журнала: 2025, Номер 12(4), С. 91 - 91

Опубликована: Апрель 16, 2025

Leaky dams have become essential nature-based solutions for flood management, providing sustainable alternatives to traditional engineered control methods. This review delves into the mechanisms by which leaky operate, including regulation of water flow through velocity reduction and distribution across floodplains, effective sediment trapping soil quality enhancement, facilitation groundwater recharge table stabilization. These structures not only mitigate peak flows reduce erosion but also contribute enhanced biodiversity creating diverse aquatic habitats maintaining ecological connectivity. The effectiveness is assessed various performance metrics, demonstrating significant reductions in flows, improved increased levels, collectively enhance ecosystem resilience quality. However, implementation presents several technical challenges, such as design complexity, hydrological variability, maintenance requirements, socio-economic factors like land use conflicts economic viability. Additionally, while offer numerous environmental benefits, potential negative impacts include habitat disruption, accumulation, alterations quality, necessitate careful planning adaptive management strategies. Emerging trends dam development focus on integration smart technologies, real-time monitoring systems artificial intelligence, optimize against climate-induced extreme weather events. Advances modeling technologies are facilitating networks, promoting their incorporation comprehensive watershed frameworks. highlights integral components systems, advocating broader adoption alongside conventional engineering achieve resilient ecologically balanced management.

Язык: Английский

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Inorganic nitrogen and phytoplankton dynamics in a subtropical reservoir during low-flow winter periods: Implications for nitrogen management

Journal of Environmental Management, Год журнала: 2025, Номер 382, С. 125429 - 125429

Опубликована: Апрель 18, 2025

Язык: Английский

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Bayesian-optimized recursive machine learning for predicting human-induced changes in suspended sediment transport

Environmental Monitoring and Assessment, Год журнала: 2025, Номер 197(5)

Опубликована: Апрель 26, 2025

Язык: Английский

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Size‐dependent effects of dams on river ecosystems and implications for dam removal outcomes

Ecological Applications, Год журнала: 2024, Номер 34(6)

Опубликована: Авг. 13, 2024

Understanding the relationship between a dam's size and its ecological effects is important for prioritization of river restoration efforts based on dam removal. Although much known about large storage dams, this information may not be applicable to small which represent vast majority dams being considered To better understand how vary with size, we conducted multidisciplinary study downstream effect range characteristics including geomorphology, water chemistry, periphyton, riparian vegetation, benthic macroinvertebrates, fish. We related variables downstream-upstream fractional difference in measured 16 mid-Atlantic region ranging from 0.9 57 m high, hydraulic residence times (HRTs) 30 min 1.5 years. For physical attributes, larger had effects. example, surface width below was greater dams. By contrast, there no sediment grain though fraction fine-grained bed material lower independently size. Larger tended reduce quality more, decreased dissolved oxygen increased temperature. inorganic nutrients (N, P, Si), but particulate P) reaches. Aquatic organisms have dissimilarity species composition (for fish periphyton), taxonomic diversity macroinvertebrates), pollution tolerance periphyton macroinvertebrates). Plants responded differently fewer invasive more Overall, these results demonstrate that impact ecosystem components measured, hence their removal has greatest potential restoring ecosystems.

Язык: Английский

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Dam-induced flow alternations drive the regime shift towards a cyanobacteria-dominated microbiota state in the Yangtze River

Water Research, Год журнала: 2023, Номер 244, С. 120527 - 120527

Опубликована: Авг. 25, 2023

Язык: Английский

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Effects of stratification and mixing on spatiotemporal dynamics and functional potential of microbial community in a subtropical large-deep reservoir driven by nutrients and ecological niche

Ecological Indicators, Год журнала: 2023, Номер 156, С. 111128 - 111128

Опубликована: Окт. 21, 2023

Seasonal thermal stratification is a common environmental phenomenon in reservoir water bodies and an important research topic for deep reservoirs. A thermally stratified ideal system investigating the interaction between factors affecting environment microorganism communities under spatial–temporal variation. However, few studies have focused on effects of mixing periods microbial nitrogen conversion. Therefore, using metagenomic sequencing quantitative polymerase chain reaction, we investigated diversity function Xin'anjiang Reservoir during period. Principal component analysis indicated that bacterial were mostly affected by stratification, mainly at 10-m depths, whereas archaea community was influenced entire profile. The predominant archaeal phyla changed from Candidatus_Woesearchaeota Euryarchaeota to Thaumarchaeota with increasing depth stratification. variations dominant strongly reflected seasonal changes vertical gradient temperature, dissolved oxygen, pH. Linear regression composition altered overall functional attributes communities, especially community. Regarding metabolism across whole reservoir, number nitrification denitrification genes dropped same direction as river flow spring summer, while opposite trend observed autumn winter. profiles transitional lacustrine zones varied considerably except Additionally, copies nitrification-related more stage than stage, denitrification-related showed trend. Overall, this study provides unique insights regarding distribution microorganisms large-deep reservoirs, which should be considered when establishing guidelines reservoirs management.

Язык: Английский

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Responses of Epilithic Diatoms to the Construction of Small Hydropower Plant in a Serbian River

Turkish Journal of Fisheries and Aquatic Sciences, Год журнала: 2024, Номер 24(7)

Опубликована: Май 23, 2024

Energy of running water accounts for almost 3/4 the global supply renewable energy sources and 1/5 total electricity generation. Large small hydropower plants are associated with a number environmental problems. The main aim this study is to investigate impact SHP on diatom community. A 149 taxa classified in 47 genera were identified, some which considered invasive (Achnanthidium druartii), rare (Gomphonema zellense, Frustulia amphipleuroides) Navicula radiosafallax first finding Serbia. evident considering diatoms diversity relative abundance dominant species three seasons (summer, autumn winter). Values most measured physico-chemical parameters changed immediately downstream SHP. Based indices, Ljuboviđa River had good ecological status. TID TDI indicated predominantly moderate quality River. According Serbian regulations, high

Язык: Английский

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