Martin Schmid
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View article: A climatological baseline for understanding patterns of seasonal lake dynamics across sub-Sahelian Africa
A climatological baseline for understanding patterns of seasonal lake dynamics across sub-Sahelian Africa Open
Lakes in sub-Sahelian Africa are facing growing ecological threats from climate change and human, yet most research has focused on a handful of well-known large lakes. This study analyses 137 lakes, many previously understudied, and identi…
View article: ALPLAKES: advancing lake research and management through open integration ofremote sensing and hydrodynamic products
ALPLAKES: advancing lake research and management through open integration ofremote sensing and hydrodynamic products Open
Alplakes is an interactive web application providing open access to operational simulations and remote sensing data for lakes in the European alpine region. The platform combines outputs from various research projects to create a digital t…
View article: Industrialization and the climate impact of land systems: the case of Austria, 1830-202
Industrialization and the climate impact of land systems: the case of Austria, 1830-202 Open
Industrialization has not only resulted in surging emissions from fossil energy combustion, it has also fundamentally altered the role of land use in greenhouse gas budgets. Most notably, a shift from deforestation to reforestation has coi…
View article: Analysis of Vortex Rope Frequencies in the Draft Tube Cone of Francis-type Turbines
Analysis of Vortex Rope Frequencies in the Draft Tube Cone of Francis-type Turbines Open
A relevant contributor to pressure pulsations at Francis-type turbines, especially at off-design operation, is the helical vortex rope and its interaction with the draft tube elbow. If the vortex rope frequency in such cases is close to th…
View article: Significant bias in pond surface temperature measurements caused by solar radiation
Significant bias in pond surface temperature measurements caused by solar radiation Open
Water temperature is a key abiotic factor routinely measured in ponds and lakes. Here we investigate potential inaccuracies in water temperature measurements caused by the heating of loggers by direct solar radiation. We conducted a compar…
View article: Integrating two‐dimensional water temperature simulations into a fish habitat model to improve hydro‐ and thermopeaking impact assessment
Integrating two‐dimensional water temperature simulations into a fish habitat model to improve hydro‐ and thermopeaking impact assessment Open
Storage hydropower plants, which are an important component of energy production in Switzerland, can lead to hydro‐ and thermopeaking, affecting river habitats and organisms. In this study, we developed an approach for integrating water te…
View article: A framework for ensemble modelling of climate change impacts on lakes worldwide: the ISIMIP Lake Sector
A framework for ensemble modelling of climate change impacts on lakes worldwide: the ISIMIP Lake Sector Open
Empirical evidence demonstrates that lakes and reservoirs are warming across the globe. Consequently, there is an increased need to project future changes in lake thermal structure and resulting changes in lake biogeochemistry in order to …
View article: A framework for ensemble modelling of climate change impacts on lakes worldwide: the ISIMIP Lake Sector
A framework for ensemble modelling of climate change impacts on lakes worldwide: the ISIMIP Lake Sector Open
Empirical evidence demonstrates that lakes and reservoirs are warming across the globe. Consequently, there is an increased need to project future changes in lake thermal structure and resulting changes in lake biogeochemistry in order to …
View article: Dynamic modelling provides new insights into development and maintenance of Lake Kivu's density stratification
Dynamic modelling provides new insights into development and maintenance of Lake Kivu's density stratification Open
Lake Kivu is a 485 m deep, Central-East African rift lake with huge amounts of carbon dioxide and methane dissolved in its stably stratified deep waters. In view of future large-scale methane extraction, one-dimensional numerical modelling…
View article: Unaccounted CO <sub>2</sub> leaks downstream of a large tropical hydroelectric reservoir
Unaccounted CO <sub>2</sub> leaks downstream of a large tropical hydroelectric reservoir Open
Significance Hydroelectric reservoirs emit substantial amounts of CO 2 , especially in the tropics. Since many such systems exist and many more will be built within decades, it is important to assess their role in the carbon cycle. A major…
View article: Lake Modeling Reveals Management Opportunities for Improving Water Quality Downstream of Transboundary Tropical Dams
Lake Modeling Reveals Management Opportunities for Improving Water Quality Downstream of Transboundary Tropical Dams Open
Water quality in tropical rivers is changing rapidly. The ongoing boom of dam construction for hydropower is one of the drivers for this change. In particular, the stratification in tropical reservoirs induces oxygen deficits in their deep…
View article: Vulnerability of Swiss lakes to climate change along an altitudinal gradient
Vulnerability of Swiss lakes to climate change along an altitudinal gradient Open
<p>Studies investigating the influence of 21<sup>st</sup> century climate warming on lakes along altitudinal gradients has been obscured by complex local atmospheric phenomena, insufficiently resolved by regional climate …
View article: Macroinvertebrate Recovery to Varying Hydropeaking Frequency: A Small Hydropower Plant Experiment
Macroinvertebrate Recovery to Varying Hydropeaking Frequency: A Small Hydropower Plant Experiment Open
As the demand for hydroelectricity progresses worldwide, small hydropower operators are increasingly examining the feasibility of using existing infrastructure (e.g., settling basins) in run-of-the-river schemes for intermittent power prod…
View article: Hydro-CH2018 Evolution of stream and lake water temperature under climate change
Hydro-CH2018 Evolution of stream and lake water temperature under climate change Open
This report presents past observations and projects the future development of water temperature in Swiss lakes and rivers. Projections are made until the end of the 21st century using the CH2018 climate scenarios. Besides climate change ef…
View article: No increasing risk of a limnic eruption at Lake Kivu: Intercomparison study reveals gas concentrations close to steady state
No increasing risk of a limnic eruption at Lake Kivu: Intercomparison study reveals gas concentrations close to steady state Open
Lake Kivu, East Africa, is well known for its huge reservoir of dissolved methane (CH4) and carbon dioxide (CO2) in the stratified deep waters (below 250 m). The methane concentrations of up to ~ 20 mmol/l are sufficiently high for commerc…
View article: Influence of Pressure and Velocity Perturbations on the Heat Release Fluctuations for Coaxial GH2/GO2 Injection
Influence of Pressure and Velocity Perturbations on the Heat Release Fluctuations for Coaxial GH2/GO2 Injection Open
Determination of the flame response to acoustic fluctuations is a crucial task during the stability analysis of rocket engines. A method to compute the flame response of single injectors to tangential pressure and velocity fluctuations has…
View article: Investigating the dynamics of Lake Kivu with quantum technology
Investigating the dynamics of Lake Kivu with quantum technology Open
<p>Lake Kivu, located on the border of Rwanda and the Democratic Republic of Congo, is a very peculiar lake in several aspects. The meromictic lake shows a vertical stratification dominated by high salt concentrations of up to 6 &…
View article: Sixty years since the creation of Lake Kariba: Thermal and oxygen dynamics in the riverine and lacustrine sub-basins
Sixty years since the creation of Lake Kariba: Thermal and oxygen dynamics in the riverine and lacustrine sub-basins Open
The current boom of dam construction at low latitudes endangers the integrity and function of major tropical river systems. A deeper understanding of the physical and chemical functioning of tropical reservoirs is essential to mitigate dam…
View article: Modeling sediment oxygen demand in a highly productive lake under various trophic scenarios
Modeling sediment oxygen demand in a highly productive lake under various trophic scenarios Open
Hypolimnetic oxygen depletion in lakes is a widespread problem and is mainly controlled by the sediment oxygen uptake (SOU) and flux of reduced substances out of the sediments (Fred). Especially in eutrophic lakes, Fred may constitute a ma…
View article: Toward an open access to high-frequency lake modeling and statistics data for scientists and practitioners – the case of Swiss lakes using Simstrat v2.1
Toward an open access to high-frequency lake modeling and statistics data for scientists and practitioners – the case of Swiss lakes using Simstrat v2.1 Open
One-dimensional hydrodynamic models are nowadays widely recognized as key tools for lake studies. They offer the possibility to analyze processes at high frequency, here referring to hourly timescales, to investigate scenarios and test hyp…
View article: Widespread diminishing anthropogenic effects on calcium in freshwaters
Widespread diminishing anthropogenic effects on calcium in freshwaters Open
Calcium (Ca) is an essential element for almost all living organisms. Here, we examined global variation and controls of freshwater Ca concentrations, using 440 599 water samples from 43 184 inland water sites in 57 countries. We found tha…