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Alfred Johny Wüest

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Related publications (118)

Prediction of surface temperature in lakes with different morphology using air temperature

Alfred Johny Wüest, Marco Toffolon, Martin Schmid, Sebastiano Piccolroaz

Temperature of the surface layer of temperate lakes is reconstructed by means of a simplified model on the basis of air temperature alone. The comparison between calculated and observed data shows a remarkable agreement (Nash-Sutcliffe efficiency indices a ...

American Society of Limnology and Oceanography2014

Large lakes as sources and sinks of anthropogenic heat: Capacities and limits

Alfred Johny Wüest, Martin Schmid

The goal of reducing carbon fuel and thereby saving energy will increase the use of lake water for heating and cooling of riparian infrastructures. This raises the question of which heat use designs meet the ecological and technical requirements for lakes, ...

2014

Interface structure and flux laws in a natural double-diffusive layering

Alfred Johny Wüest, Martin Schmid

The diffusive regime of double-diffusive convection generates staircases consisting of thin high-gradient interfaces sandwiched between convectively mixed layers. Simultaneous microstructure measurements of both temperature and conductivity from the stairc ...

Amer Geophysical Union2013

Effects of oligotrophication on primary production in peri-alpine lakes

Alfred Johny Wüest

During the second half of the 20th century untreated sewage released from housing and industry into natural waters led to a degradation of many freshwater lakes and reservoirs worldwide. In order to mitigate eutrophication, wastewater treatment plants, inc ...

American Geophysical Union2013

Optimizing turbine withdrawal from a tropical reservoir for improved water quality in downstream wetlands

Bernhard Wehrli, Alfred Johny Wüest

Large reservoirs in the tropics act as efficient nutrient traps and often develop hypoxic conditions in the hypolimnion. Both effects may have severe implications for aquatic ecosystems, such as limited primary production in downstream riparian agriculture ...

American Geophysical Union2013

Methane formation and future extraction in Lake Kivu

Natacha Tofield-Pasche, Alfred Johny Wüest, Martin Schmid

This chapter summarises the current knowledge on the vertical distribution of methane (CH4) and its formation in Lake Kivu. Additionally, we review the objectives and restrictions under consideration for sustainable extraction (safe, environmentally accept ...

Springer2012

Hypolimnetic Oxygen Depletion in Eutrophic Lakes

Alfred Johny Wüest, Beat Mueller

The oxygen-consuming processes in the hypolimnia of freshwater lakes leading to deep-water anoxia are still not well understood, thereby constraining suitable management concepts. This study presents data obtained from 11 eutrophic lakes and suggests a mod ...

Amer Chemical Soc2012

Diffusive-type of double diffusion in lakes - a review

Alfred Johny Wüest, Martin Schmid

This chapter is a contribution in honour of Gerhard H Jirka, who has been fascinated by the amazing variety of small-scale structures that nature surprises us with, particularly in stratified natural waters. Here, we focus on the diffusive regime of double ...

CRC Press2012

Simulations of a double-diffusive interface in the diffusive convection regime

Alfred Johny Wüest

Three-dimensional direct numerical simulations are performed that give us an in-depth account of the evolution and structure of the double-diffusive interface. We examine the diffusive convection regime, which, in the oceanographically relevant case, consi ...

Cambridge University Press2012

Stratification, mixing and transport processes in Lake Kivu

Alfred Johny Wüest, Martin Schmid

This chapter summarizes the knowledge on mixing and transport processes in Lake Kivu. Seasonal mixing, which varies in intensity from year to year, influences the top â ¼65 m. Below, the lake is permanently stratified, with density increasing stepwise from ...

Springer2012

MERIS observations of phytoplankton blooms in a stratified eutrophic lake

Alfred Johny Wüest

The use of spaceborne medium resolution imaging spectrometers with neural network algorithms has proven a large potential for application with optically complex inland waters. We make use of this approach to investigate the bio-physical dynamics in a eutro ...

Elsevier Science Inc2012

Nutrient cycling in Lake Kivu

Natacha Tofield-Pasche, Alfred Johny Wüest, Martin Schmid

This chapter summarizes the knowledge on mixing and transport processes in Lake Kivu. Seasonal mixing, which varies in intensity from year to year, influences the top ∼65 m. Below, the lake is permanently stratified, with density increasing stepwise from ∼ ...

Springer2012

Potential zur Wärmeenergienutzung aus dem Zürichsee. Machbarkeit. Wärmeentzug (Heizen) und Einleitung von Kühlwasser

Alfred Johny Wüest

Künftig soll der Zürichsee als Wärmeenergiequelle und als Wärmeenergiespeicher intensiver genutzt werden. Einerseits eignet sich das kühle Tiefenwasser des Sees im Sommer ideal zur Kühlung der urbanen Infrastruktur und zur Ableitung von Prozesswärme (Wüest ...

2012

Entwicklung des Phosphorhaushalts und der Sauerstoffzehrung im Sempacher- und Baldeggersee

Alfred Johny Wüest

Um die Auswirkungen der hohen Sauerstoffzehrung im Tiefenwasser von Baldegger- und Sempachersee zu mildern, werden die Hypolimnia der beiden Seen seit 1982 bzw. 1984 künstlich belüftet. Während der Stagnation im Sommer wurde anfänglich in beiden Seen über ...

2012

Comment on An additional challenge of Lake Kivu in Central Africa - upward movement of the chemoclines by Finn Hirslund

Alfred Johny Wüest, Martin Schmid

In a paper published earlier this year, Finn Hirslund suggested to release degassed deepwater from methane harvesting to the surface layer of Lake Kiwi in order to counteract an observed slow rising of the chemoclines in the lake. In this comment, we prese ...

Pagepress Publ2012

Modeling of temperature and turbidity in a natural lake and a reservoir connected by pumped-storage operations

Alfred Johny Wüest, Martin Schmid

Pumped-storage (PS) systems are used to store electric energy as potential energy for release during peak demand. We investigate the impacts of a planned 1000 MW PS scheme connecting Lago Bianco with Lago di Poschiavo (Switzerland) on temperature and parti ...

Amer Geophysical Union2012

A high resolution bathymetric map of Lake Kivu's northern basin: locating significant groundwater inflows through a geomorphologic interpretation

Alfred Johny Wüest, Martin Schmid

SwissSed2012

Lake Dianchi Kunming, Project Clear Lake. Summary Phases 1, 2 and 3. Schlussbericht und Zusammenfassung

Alfred Johny Wüest

Das Projekt "Klarer See" wurde durch Kunming und die SWISSWATER GmbH im April 2009 gestartet. Bis Januar 2012 wurden bereits 3 Projektphasen erfolgreich abgeschlossen, präsentiert und in mehr als 10 Berichten ausführlich dokumentiert. In allen Phasen wurde ...

2012

Stability of a Double-Diffusive Interface in the Diffusive Convection Regime

Alfred Johny Wüest

In this paper, the authors explore the conditions under which a double-diffusive interface may become unstable. Focus is placed on the case of a cold, freshwater layer above a warm, salty layer [i.e., the diffusive convection (DC) regime]. The "diffusive i ...

Amer Meteorological Soc2012

Methane sources and sinks in Lake Kivu

Natacha Tofield-Pasche, Alfred Johny Wüest, Martin Schmid

Unique worldwide, Lake Kivu stores enormous amounts of CH4 and CO2. A recent study reported that CH4 concentrations in the lake have increased by up to 15% in the last 30 years and that accumulation at this rate could lead to catastrophic outgassing by sim ...

Amer Geophysical Union2011

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