Article
Engineering, Environmental
Pere Colomer-Vidal, Longfei Jiang, Weiping Mei, Chunling Luo, Silvia Lacorte, Anna Rigol, Gan Zhang
Summary: This study reveals that long-chain PFASs accumulate in sediment while short-chain PFASs remain in water. Floating plants absorb high levels of PFASs, while rooted species translocate short-chain PFASs from roots to shoots.
JOURNAL OF HAZARDOUS MATERIALS
(2022)
Article
Plant Sciences
Tianshun Zhu, Wanxiang Jiang, Henglun Shen, Juanjuan Yuan, Jing Chen, Zheng Gong, Lihong Wang, Meng Zhang, Qingyang Rao
Summary: This study conducted a field survey on submerged macrophytes in impounded lakes and channel rivers of the East Route of South-to-North Water Transfer Project. It found that leaf-related traits and organ mass allocation traits were the hub traits in the trait networks of the area. The study also discovered that different water functional variation coefficients were related to different trait network topologies. Water total phosphorus and dissolved oxygen significantly affected the trait network structure. This study contributes to our understanding of the ecological rules governing trait correlations.
FRONTIERS IN PLANT SCIENCE
(2023)
Article
Environmental Sciences
John Pitlick, Alain Recking, Fred Liebault, Clement Misset, Guillaume Piton, Daniel Vazquez-Tarrio
Summary: Global compilations of river sediment loads show that mountainous areas contribute significantly to the sediment transported to the oceans. This study focused on estimating the contemporary sediment loads of 16 gravel bed rivers draining the Ecrins-Pelvoux Massif in southeast France. The results indicate a linear relationship between bed load fluxes at channel-forming flows and downstream increases in discharge, as well as a linear scaling of annual sediment loads with drainage area.
WATER RESOURCES RESEARCH
(2021)
Article
Ecology
J. Naslund, R. Bowes, L. Sandin, E. Bergman, L. Greenberg
Summary: Large boreal rivers in Sweden are significantly impacted by hydropower dams, resulting in the loss of main stem habitats. This study examines the potential of tributary mouth areas as biodiversity hotspots for fish in two impounded boreal rivers. The results show that overall fish diversity is generally low in these areas, with higher species richness and diversity found in mouth areas dominated by intermediate substrate sizes. Fine sediments dominate areas with few or no species. The fish community composition differs between tributary mouths and areas further upstream. Management actions to enhance fish diversity in tributary mouths could include protecting or restoring areas dominated by medium-sized substrate and reducing erosion and the transport of fine sediments. While tributary mouths do not appear to be hotspots for fish biodiversity, understanding the impacts and temporal dynamics of the fish community in tributaries and their mouths is crucial for appropriate management strategies.
ECOHYDROLOGY & HYDROBIOLOGY
(2023)
Article
Environmental Sciences
Fengxue Wu, Jingfu Wang, Shihao Jiang, Huaxian Zeng, Qixin Wu, Quan Chen, Jingan Chen
Summary: In this study, the interception of cascade dams on microplastics in the Wujiang River in China was investigated. The results showed that microplastics had higher abundance in the midstream, while lower pollution levels were observed in the upstream and downstream reaches. Plastic bags and polypropylene were the main plastic materials found. The abundance of microplastics was positively correlated with local GDP and negatively correlated with reservoir basin area. These findings contribute to our understanding of the migration of microplastics between terrestrial and marine ecosystems.
Article
Engineering, Marine
Langxiong Gan, Zhixue Yan, Lei Zhang, Kezhong Liu, Yuanzhou Zheng, Chunhui Zhou, Yaqing Shu
Summary: This paper proposes a path planning model for inland ships based on the safety potential field theory, which effectively describes navigation risks and generates optimal paths.
Article
Environmental Sciences
Wei Zhi, Christoph Klingler, Jiangtao Liu, Li Li
Summary: This study reconstructed daily water temperature and dissolved oxygen in rivers across the United States and Central Europe using a deep learning model. The results showed that a majority of the rivers experienced persistent warming and deoxygenation, with urban rivers exhibiting the most rapid warming and agricultural rivers experiencing the slowest warming but fastest deoxygenation.
NATURE CLIMATE CHANGE
(2023)
Article
Environmental Sciences
D. W. Haught, J. G. Venditti
Summary: Measurement of sediment in large rivers is difficult and expensive, but crucial for managing these systems in the face of climate change and rising sea levels. Acoustic methods are used to estimate suspended sediment, and a sediment-index methodology is presented and assessed for the Lower Fraser River.
WATER RESOURCES RESEARCH
(2023)
Article
Environmental Sciences
Ming Liu, Yixin He, Li Cao, Yue Zhi, Xianjin He, Tao Li, Yanyan Wei, Xiaobing Yuan, Bingsheng Liu, Qiang He, Hong Li, Xiaojun Miao
Summary: This study investigates the transformation mechanisms of dissolved inorganic nitrogen (DIN) under hydrodynamic turbulence. Field investigation reveals that NH+4 concentrations are lower in flood seasons compared to drought seasons, while laboratory results demonstrate that limitation of dissolved oxygen (DO) causes inactive nitrification and active denitrification in sediment. Turbulence decreases NH4+ and NO2- concentrations, but increases NO(3 )(-)and total DIN concentrations in the overlying water.
ENVIRONMENTAL POLLUTION
(2022)
Article
Engineering, Civil
Teresa Serra, Marianna Soler, Aina Barcelona, Jordi Colomer
Summary: Sediment-replenished artificial flooding results in a more balanced suspended sediment transport compared to non-sediment-replenishment cases, with higher sedimentation rates during flood events.
JOURNAL OF HYDROLOGY
(2022)
Article
Chemistry, Multidisciplinary
Xiaodan Tang, Zhenghe Li, Shan He, Binghan Yang, Zeyu Zhang, Bing Li, Yuyan Zhao
Summary: This study provides a scientific reference for the investigation and treatment of nitrogen and phosphorus pollution in surface water of typical old industrial cities in China. The results showed that the pollution of nitrogen and phosphorus in the main rivers of Changchun City was serious, and their spatial distribution varied greatly. In terms of time, remarkable results have been achieved in the pollution control of ammonia and phosphorus through government river management efforts.
APPLIED SCIENCES-BASEL
(2022)
Article
Environmental Sciences
Ali Aldrees, Abubakr Taha Bakheit Taha, Abdeliazim Mustafa Mohamed
Summary: Water structure construction is a crucial aspect of managing and sustainably developing water basins. This research examines the challenges in understanding sediment characteristics and dynamics, and tests different models for predicting sediment output and transport. The study highlights the importance of river geometry and water flow parameters in predicting sediment load.
Article
Environmental Sciences
Arman Haddadchi, Calvin W. Rose
Summary: Interpreting the links between fine sediment storage and suspended sediment transport during flood events is crucial for understanding river geomorphology and the impacts on water quality and bed habitats. A physically based model of suspended sediment transport, coupled with fine sediment deposition and re-entrainment processes within the gravel bed, is presented. The model provides valuable information on the dynamics of fine sediment and its effects on river bed changes. Testing the model with data from flood events in the Oreti River in New Zealand shows good agreement between observed and modeled fine sediment concentration and load. The model can be used for routing suspended sediment concentration and changes in fine sediment deposition in river networks.
WATER RESOURCES RESEARCH
(2022)
Article
Environmental Sciences
Haoke Cheng, Xiaolian Zhu
Summary: The transport, transformation, and fate of phosphorus in river systems are influenced by hydrodynamic conditions. Experimental results showed that the uptake of phosphorus by bed sediments was significantly affected by flow velocity, with different stages of absorption observed over time. A linear relationship was found between the phosphorus fraction in bed sediments and the square root of time lapsed, indicating the dominant role of diffusional processes in phosphorus uptake.
WATER AND ENVIRONMENT JOURNAL
(2021)
Editorial Material
Environmental Sciences
Jr-Chuan Huang, Tsung-Yu Lee
Summary: Extreme climate events such as heavy rainstorms and typhoons have strong impacts on river systems, accelerating nutrient transport, stimulating river response, and threatening the safe operation of hydraulic facilities and coastal communities. Therefore, it is necessary to comprehensively explore these strong impacts on river systems.
Article
Limnology
Sabine Hilt, Hans-Peter Grossart, Daniel F. McGinnis, Frank Keppler
Summary: Methane emissions from aquatic ecosystems, which contribute to about half of total global methane emissions, were traditionally attributed to methanogenic archaea in anoxic or suboxic conditions. However, recent studies have shown evidence of methane production in aerobic conditions in freshwater, brackish, and marine habitats. The role of submerged macrophytes in methane production in oxic waters has been largely overlooked, despite their presence in littoral zones of ponds, lakes, and coastal systems. Understanding the contribution of submerged macrophytes to methane emissions is crucial for estimating global methane emissions from aquatic ecosystems and improving our understanding of spatial and temporal dynamics of methane emissions.
LIMNOLOGY AND OCEANOGRAPHY
(2022)
Article
Limnology
Timon Langenegger, Dominic Vachon, Daphne Donis, Daniel F. McGinnis
Summary: This study used a mass balance approach to derive high-resolution depth profiles of methane oxidation rates in a small eutrophic lake. The results showed that sediment methane flux is the main source of uncertainty in deriving oxidation rates. The study also highlighted the limitations of estimating methane oxidation based on δC-13(CH4).
LIMNOLOGY AND OCEANOGRAPHY
(2022)
Article
Biodiversity Conservation
Lianghong Long, Peng Chen, Hui Xu, Daobin Ji, Liu Liu, Zhengjian Yang, Andreas Lorke
Summary: By analyzing hydrological and water temperature data, this study found that the water temperature in the middle reaches of the Yangtze River increased in the spring and winter seasons after the filling of upstream reservoirs, leading to a weakening of stratification and a reduction in phytoplankton blooms in tributary bays.
ECOLOGICAL INDICATORS
(2022)
Article
Environmental Sciences
Caroline Ganglo, Clara Mendoza-Lera, Alessandro Manfrin, Rossano Bolpagni, Verena Gerstle, Sara Kolbenschlag, Eric Bollinger, Ralf Schulz, Andreas Lorke
Summary: Shallow lentic aquatic ecosystems, such as ponds, play a crucial role in carbon cycling and greenhouse gas emission. Tube-dwelling benthic invertebrates, like chironomids, may have a significant impact on the carbon budget of these ecosystems, but their role is still poorly understood.
SCIENCE OF THE TOTAL ENVIRONMENT
(2023)
Article
Meteorology & Atmospheric Sciences
S. Guseva, F. Armani, A. R. Desai, N. L. Dias, T. Friborg, H. Iwata, J. Jansen, G. Luko, I Mammarella, I Repina, A. Rutgersson, T. Sachs, K. Scholz, U. Spank, V Stepanenko, P. Torma, T. Vesala, A. Lorke
Summary: In this study, the variability of the drag coefficient, Stanton number, and Dalton number in lakes and reservoirs of different sizes and depths was evaluated through direct measurements of surface fluxes. The results showed that these coefficients increase at low wind speeds due to the presence of gusts and capillary waves. At high wind speeds, the coefficients remain relatively constant. Therefore, it is recommended to consider the effects of gustiness and capillary waves on the drag coefficient and Stanton number, while the Dalton number can be assumed constant at all wind speeds.
JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES
(2023)
Article
Environmental Sciences
Rafael de Carvalho Bueno, Tobias Bleninger, Bertram Boehrer, Andreas Lorke
Summary: This study investigates the dynamics of vertical mixing and the occurrence of internal waves in lakes and reservoirs. The results show that the basin shape significantly affects energy dissipation and the generation of internal waves. Most energy loss occurs at the sloping boundary. It is suggested that the application of the Wedderburn number and derived mixing classifications to basins with sloping bathymetry and complex shape should be critically scrutinized.
ENVIRONMENTAL FLUID MECHANICS
(2023)
Article
Limnology
Ena Lucia Suarez, Lukas De Ventura, Arno Stockli, Cesar Ordonez, Mridul K. Thomas, Bastiaan W. Ibelings, Daniel F. McGinnis
Summary: This study examines the persistence and changes of toxic cyanobacteria P. rubescens in Lake Hallwil over 35 years. Despite reductions in phosphorus levels and improvements in lake transparency, the population maximum of P. rubescens has moved deeper. It is now found in the hypolimnion, potentially due to reduced buoyancy regulation and restricted metabolic activity.
LIMNOLOGY AND OCEANOGRAPHY
(2023)
Article
Engineering, Environmental
Gang Xu, Yanxue Zhang, Tiantian Yang, Huaming Wu, Andreas Lorke, Min Pan, Bangding Xiao, Xingqiang Wu
Summary: Light plays a crucial role in algal growth and the formation of surface blooms. This study examines the impact of light-mediated variations in colony morphology on the buoyancy of Microcystis colonies. Results show that colony size and compactness have different responses to light intensity, with higher compactness beneficial for long-term buoyancy maintenance under low light conditions, but decreased compactness observed under higher light intensity.
Article
Environmental Sciences
Xiaolin Zhang, Xiaoqiang Yang, Robert Hensley, Andreas Lorke, Michael Rode
Summary: In-stream nitrate uptake in rivers is influenced by complex autotrophic and heterotrophic pathways, which vary spatiotemporally. High-frequency monitoring of nitrate mass balance can quantitatively analyze uptake dynamics, but has not been fully explored in higher-order streams. We conducted monitoring in five high-order stream reaches, finding substantial differences in net nitrate uptake rates and the dominance of different processes between wet and dry seasons. These findings advance our understanding of N-retention processes at the reach scale and can contribute to river-network modeling concepts.
WATER RESOURCES RESEARCH
(2023)
Article
Multidisciplinary Sciences
Cesar Ordonez, Tonya DelSontro, Timon Langenegger, Daphne Donis, Ena L. Suarez, Daniel F. McGinnis
Summary: Recent discoveries challenge the paradigm by showing that oxic methane production (OMP) occurs in oxygenated surface waters worldwide. This study determines the net methane production rates in oxic surface waters of four pre-alpine lakes and finds that OMP is often the dominant source of diffusive methane emissions. Correlations with photosynthesis provide an empirical upscaling approach. Understanding the extent and drivers of OMP is crucial for constraining the atmospheric methane contribution by inland waters.
NATURE COMMUNICATIONS
(2023)
Article
Geosciences, Multidisciplinary
Michael Schwarz, Lediane Marcon, Andreas Lorke
Summary: The release of gas bubbles from aquatic sediments, known as ebullition, has attracted scientific interest due to its contribution to methane emissions and its potential for transporting resources and pollutants. While the transport of substances by bubbles is well-studied in open water, research on natural bubbles formed in aquatic sediments is limited. This study summarizes current research on bubble mediated transport (BMT) from aquatic sediments and presents experimental results from a shallow reservoir. The findings highlight the need for further experiments to enhance understanding of BMT.
FRONTIERS IN EARTH SCIENCE
(2023)
Editorial Material
Environmental Sciences
Daniel F. McGinnis, Yves T. Prairie, Hans-Peter Grossart, Tonya DelSontro
FRONTIERS IN ENVIRONMENTAL SCIENCE
(2023)
Article
Environmental Sciences
Lediane Marcon, Michael Schwarz, Laura Backes, Mara Offermann, Felix Schreiber, Stephan Hilgert, Klajdi Sotiri, Christian Jokiel, Andreas Lorke
Summary: Gas storage in freshwater sediment plays an important role in buffering and modulating methane emissions and should be accounted for in models.
JOURNAL OF GEOPHYSICAL RESEARCH-BIOGEOSCIENCES
(2023)
Article
Water Resources
Caroline Ganglo, Alessandro Manfrin, Clara Mendoza-Lera, Andreas Lorke
Summary: Shallow lentic freshwater aquatic systems are globally significant sources of methane emissions. The use of biocides to reduce chironomid density can increase methane emissions in the aquatic-terrestrial transition zone. The reduction in bioturbation by chironomids leads to decreased oxygen transport into the sediment, promoting methane production.
FRONTIERS IN WATER
(2022)
Article
Geosciences, Multidisciplinary
Mayra Ishikawa, Wendy Gonzalez, Orides Golyjeswski, Gabriela Sales, J. Andreza Rigotti, Tobias Bleninger, Michael Mannich, Andreas Lorke
Summary: Numerical models are valuable tools for simulating various aspects of lakes and reservoirs. The dimensionality of the models affects their computational requirements and accuracy. In this study, three models of different dimensions were compared and their simplifications were analyzed. The higher dimensional models showed better performance in simulating various parameters. The study highlights the importance of model dimensionality and its impact on model results.
GEOSCIENTIFIC MODEL DEVELOPMENT
(2022)
