| publications-2531 |
Peer reviewed articles |
2021 |
R. Iestyn Woolway, Sapna Sharma, Gesa A. Weyhenmeyer, Andrey Debolskiy, Malgorzata Golub, Daniel Mercado-BettĂn, Marjorie Perroud, Victor Stepanenko, Zeli Tan, Luke Grant, Robert Ladwig, Jorrit Mesman, Tadhg N. Moore, Tom Shatwell, Inne Vanderkelen, Jay A. Austin, Curtis L. DeGasperi, Martin Dokulil, Sofia La Fuente, Eleanor B. Mackay, S. Geoffrey Schladow, Shohei Watanabe, Rafael MarcĂ©, Don C. |
Phenological shifts in lake stratification under climate change |
Nature Communications |
10.1038/s41467-021-22657-4 |
Simulation & Modeling |
Natural Water Bodies |
|
AbstractOne of the most important physical characteristics driving lifecycle events in lakes is stratification. Already subtle variations in the timing of stratification onset and break-up (phenology) are known to have major ecological effects, mainly by determining the availability of light, nutrients, carbon and oxygen to organisms. Despite its ecological importance, historic and future global changes in stratification phenology are unknown. Here, we used a lake-climate model ensemble and long-term observational data, to investigate changes in lake stratification phenology across the Northern Hemisphere from 1901 to 2099. Under the high-greenhouse-gas-emission scenario, stratification will begin 22.0â±â7.0 days earlier and end 11.3â±â4.7 days later by the end of this century. It is very likely that this 33.3â±â11.7 day prolongation in stratification will accelerate lake deoxygenation with subsequent effects on nutrient mineralization and phosphorus release from lake sediments. Further misalignment of lifecycle events, with possible irreversible changes for lake ecosystems, is also likely. |
722518 |
|
|
|
| publications-2532 |
Peer reviewed articles |
2020 |
Apostolos Apostolakis, Mauro F. Pereira |
Superlattice nonlinearities for Gigahertz-Terahertz generation in harmonic multipliers |
Nanophotonics |
10.1515/nanoph-2020-0155 |
Uncategorized |
Uncategorized |
|
Abstract Semiconductor superlattices are strongly nonlinear media offering several technological challenges associated with the generation of high-frequency Gigahertz radiation and very effective frequency multiplication up to several Terahertzs. However, charge accumulation, traps and interface defects lead to pronounced asymmetries in the nonlinear current flow, from which high harmonic generation stems. This problem requires a full non-perturbative solution of asymmetric current flow under irradiation, which we deliver in this paper within the Boltzmann-Bloch approach. We investigate the nonlinear output on both frequency and time domains and demonstrate a significant enhancement of even harmonics by tuning the interface quality. Moreover, we find that increasing arbitrarily the input power is not a solution for high nonlinear output, in contrast with materials described by conventional susceptibilities. There is a complex combination of asymmetry and power values leading to maximum high harmonic generation. |
832876 |
|
|
|
| publications-2533 |
Peer reviewed articles |
2021 |
Margaret Armstrong, Lilith Kramer, Lisette Nicole Senerpont Domis, Dianneke Wijk, Alena Sonja Gsell, Wolf M. Mooij, Sven Teurlincx |
Flipping Lakes: Explaining concepts of catchmentâscale water management through a serious game |
Limnology and Oceanography: Methods |
10.1002/lom3.10436 |
Simulation & Modeling |
Precipitation & Ecological Systems |
|
AbstractOngoing anthropogenic and climatic pressures on inland waters have made water quality management a challenge of the 21st century. A holistic catchmentâscale approach to water management which includes stakeholder participation will be a key in maintaining lake health. A first step toward community engagement is to bolster environmental literacy on lake management, ecology, and eutrophication concepts of stakeholders now and in future generations. However, communicating with nonwater professionals about effects of pollution on water quality and catchmentâscale interactions across space and time can be difficult. Here, we present âFlipping Lakes,â a gamesâbased method for lake professionals to communicate and educate about catchmentâlevel water quality management to diverse audiences. In Flipping Lakes, the players take on the role of water managers in a catchment and are tasked to prevent a lake from âflippingâ from a clear to a turbid state. During the game, the catchment slowly becomes polluted by a range of sources of which the effects are exacerbated by societal or climatic scenarios. Players need to implement measures while taking into consideration the intrinsic properties of the catchment in order to keep lakes clean. The game was tested with a diverse range of user groups and was wellâreceived. With its entertaining and accessible content, Flipping Lakes can lower communication barriers and increase understanding of difficult water quality concepts. The game is highly customizable, making it applicable to a variety of settings to support education and engagement of stakeholders and the broader community in order to address local water challenges around the globe. |
722518 |
|
|
|
| publications-2534 |
Peer reviewed articles |
2022 |
Hares Khan, Rafael Marcé, Alo Laas, Biel Obrador |
The relevance of pelagic calcification in the global carbon budget of lakes and reservoirs |
Limnetica |
10.23818/limn.41.02 |
Uncategorized |
Natural Water Bodies |
|
No abstract available |
722518 |
|
|
|
| publications-2535 |
Peer reviewed articles |
2018 |
Zsuzsanna Nagy-KovĂĄcs, BalĂĄzs LĂĄszlĂł, ErnĆ Fleit, Katalin Czichat-MĂĄrtonnĂ©, GĂĄbor Till, Hilmar Börnick, Yasmin Adomat, Thomas Grischek |
Behavior of Organic Micropollutants During River Bank Filtration in Budapest, Hungary |
Water |
10.3390/w10121861 |
Data Management & Analytics |
Groundwater |
|
This paper summarizes results from a half-year sampling campaign in Budapest, when Danube River water and bank filtrate were analyzed for 36 emerging micropollutants. Twelve micropollutants were detected regularly in both river water and bank filtrate. Bisphenol A, carbamazepine, and sulfamethoxazole showed low removal (<20%) during bank filtration on Szentendre Island and Csepel island, whereas 1H-benzotriazole, tolyltriazole, diclofenac, cefepime, iomeprol, metazachlor, and acesulfame showed medium to high removal rates of up to 78%. The concentration range in bank filtrate was much lower compared to river water, proving the equilibration effect of bank filtration for water quality. |
689450 |
|
|
|
| publications-2536 |
Peer reviewed articles |
2021 |
Nasime Janatian, Kalle Olli, Peeter NÔges |
Phytoplankton responses to meteorological and hydrological forcing at decadal to seasonal time scales |
Hydrobiologia |
10.1007/s10750-021-04594-x |
Simulation & Modeling |
River Basins |
|
AbstractOne of the challenges for predicting global change effects on aquatic ecosystems is the vague understanding of the mechanisms of multiple controlling factors affecting phytoplankton dynamics at different time scales. Here we distinguish between hydrometeorological forcing of phytoplankton dynamics at time scales from days to decades based on a 54-year monthly phytoplankton time series from a large shallow Lake VĂ”rtsjĂ€rv (58°16âČN, 26°02âČE) in Estonia, combined with daily data on forcing factorsâthermal-, wind-, light- and water-level regimes. By using variance partitioning with linear mixed effect modelling (LME), we found a continuum from the large dominant K-selected filamentous cyanobacteria with strongest decadal scale variation (8â30%) to r-selected phytoflagellates with large stochastic variability (80â96%). External forcing revealed strong seasonal variation (up to 80%), while specifically water level and wind speed had a robust decadal variation (8% and 20%, respectively). The effect of external variables was proportionally manifested in the time scales of phytoplankton variation. Temperature, with a clear seasonal variation, had no impact on the dominant cold tolerant filamentous cyanobacteria in Lake VĂ”rtsjĂ€rv. We found the LME as a reliable method for resolving the temporal cross-scale problem. It yielded quantitative results that matched our intuitive understanding of the dynamics of different variables. |
722518 |
|
|
|
| publications-2537 |
Peer reviewed articles |
2020 |
Yasmin Adomat, Gerit-Hartmut Orzechowski, Marc Pelger, Robert Haas, Rico Bartak, Zsuzsanna Ăgnes Nagy-KovĂĄcs, Joep Appels, Thomas Grischek |
New Methods for Microbiological Monitoring at Riverbank Filtration Sites |
Water |
10.3390/w12020584 |
Data Management & Analytics |
Groundwater |
|
Water suppliers aim to achieve microbiological stability throughout their supply system by regular monitoring of water quality. Monitoring temporal biomass dynamics at high frequency is time consuming due to the labor-intensive nature and limitations of conventional, cultivation-based detection methods. The goal of this study was to assess the value of new rapid monitoring methods for quantifying and characterizing dynamic fluctuations in bacterial biomass. Using flow cytometry and two precise enzymatic detection methods, bacterial biomass-related parameters were monitored at three riverbank filtration sites. Additionally, the treatment capacity of an ultrafiltration pilot plant was researched using online flow-cytometry. The results provide insights into microbiological quality of treated water and emphasize the value of rapid, easy and sensitive alternatives to traditional bacterial monitoring techniques. |
689450 |
|
|
|
| publications-2538 |
Peer reviewed articles |
2020 |
Andrea F. Brunsch, Pedro Zubieta Florez, Alette A.M. Langenhoff, Thomas L. ter Laak, Huub H.M. Rijnaarts |
Retention soil filters for the treatment of sewage treatment plant effluent and combined sewer overflow |
Science of The Total Environment |
10.1016/j.scitotenv.2019.134426 |
Data Management & Analytics |
River Basins |
|
No abstract available |
689450 |
|
|
|
| publications-2539 |
Peer reviewed articles |
2021 |
Robin WĂŒnsch, Carina Mayer, Julia Plattner, Fabienne Eugster, Richard WĂŒlser, Jens Gebhardt, Uwe HĂŒbner, Silvio Canonica, Thomas Wintgens, Urs von Gunten |
Micropollutants as internal probe compounds to assess UV fluence and hydroxyl radical exposure in UV/H2O2 treatment |
Water Research |
10.1016/j.watres.2021.116940 |
Uncategorized |
River Basins |
|
No abstract available |
689450 |
|
|
|
| publications-2540 |
Peer reviewed articles |
2021 |
A K M Khabirul Islam, Patrick S. M. Dunlop, Neil J. Hewitt, Rose Lenihan, Caterina Brandoni |
Bio-Hydrogen Production from Wastewater: A Comparative Study of Low Energy Intensive Production Processes |
Clean Technologies |
10.3390/cleantechnol3010010 |
Simulation & Modeling |
River Basins |
|
Billions of litres of wastewater are produced daily from domestic and industrial areas, and whilst wastewater is often perceived as a problem, it has the potential to be viewed as a rich source for resources and energy. Wastewater contains between four and five times more energy than is required to treat it, and is a potential source of bio-hydrogenâa clean energy vector, a feedstock chemical and a fuel, widely recognised to have a role in the decarbonisation of the future energy system. This paper investigates sustainable, low-energy intensive routes for hydrogen production from wastewater, critically analysing five technologies, namely photo-fermentation, dark fermentation, photocatalysis, microbial photo electrochemical processes and microbial electrolysis cells (MECs). The paper compares key parameters influencing H2 production yield, such as pH, temperature and reactor design, summarises the state of the art in each area, and highlights the scale-up technical challenges. In addition to H2 production, these processes can be used for partial wastewater remediation, providing at least 45% reduction in chemical oxygen demand (COD), and are suitable for integration into existing wastewater treatment plants. Key advancements in lab-based research are included, highlighting the potential for each technology to contribute to the development of clean energy. Whilst there have been efforts to scale dark fermentation, electro and photo chemical technologies are still at the early stages of development (Technology Readiness Levels below 4); therefore, pilot plants and demonstrators sited at wastewater treatment facilities are needed to assess commercial viability. As such, a multidisciplinary approach is needed to overcome the current barriers to implementation, integrating expertise in engineering, chemistry and microbiology with the commercial experience of both water and energy sectors. The review concludes by highlighting MECs as a promising technology, due to excellent system modularity, good hydrogen yield (3.6â7.9 L/L/d from synthetic wastewater) and the potential to remove up to 80% COD from influent streams. |
734560 |
|
|
|
