Institutsname Modelling groundwater recharge of an urban area

Institutsname Modelling groundwater recharge of an urban area in, Volkmar Germany Sabine Tesch Dunger , Jörg Matschullat 1 1 Interdisciplinary 2 Environmental Research Centre, Technische Universität Bergakademie Freiberg 2 Institute of Geology, Technische Universität Bergakademie Freiberg Germany 1

What is the challenge? § Problems in urban areas Ø Increasing land use, sealing § Existing methods empirical models Ø Long term average § Prediction of climate changerelated intra-annual influences Ø Short time step model Ø BOWAM Model Sabine Tesch Interdisciplinary Environmental Research Centre (IÖZ) reduced soil evaporation increased surface runoff paved surface reduced groundwater recharge BALWOIS 2010 Conference Ohrid, Republic of Macedonia May 25, 2010

Study Area Sabine Tesch BALWOIS 2010 Conference Interdisciplinary Environmental Research Centre (IÖZ) Ohrid, Republic of Macedonia May 25, 2010 TU Bergakademie Freiberg

Data base Digital data sets Meteorological Data Ø 1991 -2005 Ø 3 climate stations Ø 22 rain gauges Sabine Tesch BALWOIS 2010 Conference Interdisciplinary Environmental Research Centre (IÖZ) Ohrid, Republic of Macedonia May 25, 2010 TU Bergakademie Freiberg

Data base Digital data sets Meteorological Data Ø 1991 -2005 Ø 3 climate stations Ø 22 rain gauges Geological Data Sabine Tesch BALWOIS 2010 Conference Interdisciplinary Environmental Research Centre (IÖZ) Ohrid, Republic of Macedonia May 25, 2010 TU Bergakademie Freiberg

Data base Digital data sets Meteorological Data Ø 1991 -2005 Ø 3 climate stations Ø 22 rain gauges Geological Data Soil Data Sabine Tesch BALWOIS 2010 Conference Interdisciplinary Environmental Research Centre (IÖZ) Ohrid, Republic of Macedonia May 25, 2010 TU Bergakademie Freiberg

Data base Digital data sets Meteorological Data Ø 1991 -2005 Ø 3 climate stations Ø 22 rain gauges Geological Data Soil cover Sabine Tesch BALWOIS 2010 Conference Interdisciplinary Environmental Research Centre (IÖZ) Ohrid, Republic of Macedonia May 25, 2010 TU Bergakademie Freiberg

Data base Digital data sets Meteorological Data Ø 1991 -2005 Ø 3 climate stations Ø 22 rain gauges Geological Data Soil cover Mean depth to groundwater Sabine Tesch BALWOIS 2010 Conference Interdisciplinary Environmental Research Centre (IÖZ) Ohrid, Republic of Macedonia May 25, 2010 TU Bergakademie Freiberg

Data base Digital data sets Meteorological Data Ø 1991 -2005 Ø 3 climate stations Ø 22 rain gauges Morphological Data Geological Data Soil cover Mean depth to groundwater Sabine Tesch BALWOIS 2010 Conference Interdisciplinary Environmental Research Centre (IÖZ) Ohrid, Republic of Macedonia May 25, 2010 TU Bergakademie Freiberg

Simulated GW-recharge (1991 -2005) range < 50 to > 300 mm a-1 Sabine Tesch BALWOIS 2010 Conference Interdisciplinary Environmental Research Centre (IÖZ) Ohrid, Republic of Macedonia TU Bergakademie Freiberg May 25, 2010

Hydrological year 2002 Sabine Tesch BALWOIS 2010 Conference Interdisciplinary Environmental Research Centre (IÖZ) Ohrid, Republic of Macedonia TU Bergakademie Freiberg May 25, 2010

Hydrological year 2003 Sabine Tesch BALWOIS 2010 Conference Interdisciplinary Environmental Research Centre (IÖZ) Ohrid, Republic of Macedonia TU Bergakademie Freiberg May 25, 2010

Conclusions § groundwater recharge for monthly and annual time steps of an urban area in Germany § Temporal and spatial variability of groundwater recharge for long-term annual average for the time period 1991 -2005 § Short time steps exemplarily for 2002 and 2003 § Results lack calibration Sabine Tesch BALWOIS 2010 Conference Interdisciplinary Environmental Research Centre (IÖZ) Ohrid, Republic of Macedonia TU Bergakademie Freiberg May 25, 2010

Outlook § Model calibration § Quantification groundwater recharge for regionalized future scenarios of climate change § testing climate change adaptation for the model region of Dresden Sabine Tesch BALWOIS 2010 Conference Interdisciplinary Environmental Research Centre (IÖZ) Ohrid, Republic of Macedonia TU Bergakademie Freiberg May 25, 2010

Institutsname Thank you for attention Volkmar Dunger, Jörg Matschulat BMBF- Federal Ministry of Education and Research (Financial support)

The BOWAM Model § Two-dimensional water balance model: Sabine Tesch Interdisciplinary Environmental Research Centre (IÖZ) TU Bergakademie Freiberg