701-0034-20L Integrated Practical: Cycle of Matter in Lakes
Semester | Spring Semester 2022 |
Lecturers | B. Wehrli |
Periodicity | yearly recurring course |
Language of instruction | German |
Courses
Number | Title | Hours | Lecturers | |||||||||||||||||||
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701-0034-20 P | Integriertes Praktikum: Stoffkreisläufe in Seen Permission from lecturers required for all students.
Blockkurs, Programm gemäss Angaben in Moodle Das Praktikum findet weitgehend im Freien statt. | 3 hrs |
| B. Wehrli |
Catalogue data
Abstract | We analyse a lake as a biogeochemical environmental system. 1. Catchment: We determine the material loads of in- and outflows and trends in the lake's reservoir 2. Sediment archives: We estimate sedimentation rates and reconstruct the environmental history. 3. Light and dark: We analyse vertical water profiles and estimate rates of photosynthesis and respiration. |
Learning objective | Students learn how to analyze a lake as a biogeochemical system • They apply relevant methods for sampling and analyzing chemical parameters of rivers, lake water and the sediment. • They calculate fluxes via the in- and outflows and they determine long-term changes in the budget of a lake • Students are able to estimate sedimentation rates and to reconstruct environmental history from sediment records • They apply simple models to quantify process rates of photosynthesis and respiration based on the daily and seasonal dynamics of chemical concentrations in the water column. |
Content | Viele Schweizer Seen haben seit den 1950er Jahre eine Phase der Überdüngung durchgemacht. Dank verbesserter Abwasserbehandlung, Phosphatverbot und Massnahmen in der Landwirtschaft hat sich die Wasserqualität in vielen Seen in den letzten Jahrzehnten stark verbessert. Die Zielsetzung einer mittleren Produktion und einer genügenden Sauerstoffversorgung in der Tiefe ist in vielen Fällen erreicht worden. Der Gemeindeverband am Sempachersee hat zusätzliche See-interne Massnahmen durchgeführt. In diesem Praktikum analysieren wir den aktuellen Zustand der Nährstoffbelastung aus Landwirtschaft und Abwasser, wir rekonstruieren langfristige Trends und wir ermitteln die Zusammenhänge zwischen den Stoffkreisläfen von Phosphor, Stickstoff, Sauerstoff und den Treibhausgasen von Kohlenstoff. |
Lecture notes | Detailed handouts will be distributed via Moodle |
Literature | https://sempachersee.ch/ website in German |
Prerequisites / Notice | none |
Performance assessment
Performance assessment information (valid until the course unit is held again) | |
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ECTS credits | 2 credits |
Examiners | B. Wehrli |
Type | ungraded semester performance |
Language of examination | German |
Repetition | Repetition only possible after re-enrolling for the course unit. |
Learning materials
No public learning materials available. | |
Only public learning materials are listed. |
Groups
No information on groups available. |
Restrictions
General | Permission from lecturers required for all students |
Offered in
Programme | Section | Type | |
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Environmental Sciences Bachelor | Additional Compulsory Courses | W | ![]() |