CLIMATE CHANGE Consequences for Alpine Lakes & Management 20. May 2011 Mid-Term Conference Sarnico
Mid-Term Conference Sarnico First results on Austrian lakes Liselotte SCHULZ & Till HARUM Roswitha FRESNER, Albrecht LEIS, Georg SANTNER 20. May 2011 Mid-Term Conference Sarnico
SILMAS Questions Climatic changes influenced our lakes in the past ? Are there impacts on water temperature, water household and water quality ? What could happen to the lakes in the future ?
Frankreich Deutschland Italien
Lakes investigated: Ossiacher See Wörthersee Klopeiner See
SILMAS Investigations Analysis of long term data (1930 – 2011) from climatology, hydrology & water quality parameters additional collection of actual water temperature data & chemical- biological data Determination of inflow, outflow and residence time of lake water by using environmental isotopes
Hydrological modelling SILMAS Hydrological modelling Calibration of rainfall-runoff-models on the basis of measured data Simulation of past water balance changes Simulation of future scenarios
SILMAS Aims Rainfall-runoff model for the lakes catchment RAINFALL POTENTIAL EVAPORATION MODEL PARAMETERS RUNOFF COMPONENTS EVAPORATION RECHARGE
SILMAS First Results Air temperature & Precipitation & Evaporation Discharge of In- and Outflow Water Temperature Environmental Isotopes
Air temperature & Precipitation & Evaporation HISTALP station Klagenfurt Air temperature & Precipitation & Evaporation HISTALP station Klagenfurt
Discharge of In- and Outflow Lake: Ossiacher See Discharge of In- and Outflow
Annual Water Temperature Development Lake: Klopeiner See Annual Water Temperature Development
Water Temperature Lake Ossiacher See
Annual Average Water Temperature
Annual Average Water Temperature
Annual Average Water Temperature Klopeiner See
Stable isotopes Oxygen-18 and Deuterium Origin (source) of water in the lake Mixing processes Age of the water Evaporation processes in lakes Deliver information about:
Residence time of deeper lake water Determination: how long does it take for rain water to reach the deeper zone of a lake Bomb peak: Tritium in precipitation as tracer for residence time in lakes: The 3H-3He method Tritium concentration in precipitation
Mean residence time of lake water in the deepest zones of the Austrian lakes Wörthersee Ossiacher See Klopeinersee
Output and Deliverables: Development of a climate change related modelling approach which can be used to interpret changes of water balance and circulation behaviour and their influence on water quality Validation of the vulnerability concerning nutrient loading related to water balance and residence time Instrument for the decision support for lake managers to fulfil the criteria of the WFD to reach or save the good ecological status
critical evaluation of permissions for interventions on lakes: bank protection works pontoons marinas and boat license extraction of water drinking water supply, irrigation, hydropower, heat pump …
Proof and advantage of global warming Thank you for attention Die Seen werden und gegenüber Belastungen sensibler und daher müssen die Manager sorgfältiger und kritischer Eingriffe in das Ökosystem bewerten.