A coupled lake-groundwater model applied to lakes in the Newer - - PowerPoint PPT Presentation

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A coupled lake-groundwater model applied to lakes in the Newer - - PowerPoint PPT Presentation

Apr 16, 2023 47 likes •284 views

Martin Ankor A coupled lake-groundwater model applied to lakes in the Newer Volcanic Province Jon Tyler & Derrick Hasterok (University of Adelaide) Peter Dahlhaus & Jessica Reeves (Federation University) Matthew Currell (RMIT), Dioni

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A coupled lake-groundwater model applied to lakes in the Newer Volcanic Province

Martin Ankor

Jon Tyler & Derrick Hasterok (University of Adelaide) Peter Dahlhaus & Jessica Reeves (Federation University) Matthew Currell (RMIT), Dioni Cendon & Cath Hughes (ANSTO)

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University of Adelaide 2

WHY MODEL LAKES?

https://celebrating200years.noaa.gov/ breakthroughs/climate_model/ modeling_schematic.html

Climate models Lake sediments – palaeoclimate records Projections of lake behaviour Current monitoring Lake leake water level change

KIRONO D. G. C., KENT D. M., JONES R. N. & LEAHY P . J. 2012. Assessing Climate Change Impacts and Risks on Three Salt Lakes in Western Victoria, Australia. Human and Ecological Risk Assessment: An International Journal. 18, 152-167.

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SLIDE 3

University of Adelaide 3

WHY MODEL LAKES?

https://celebrating200years.noaa.gov/ breakthroughs/climate_model/ modeling_schematic.html

Climate models Lake sediments – palaeoclimate records Projections of lake behaviour Current monitoring Lake leake water level change

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KIRONO D. G. C., KENT D. M., JONES R. N. & LEAHY P . J. 2012. Assessing Climate Change Impacts and Risks on Three Salt Lakes in Western Victoria, Australia. Human and Ecological Risk Assessment: An International Journal. 18, 152-167.

Occurs under transient conditions

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SLIDE 4

University of Adelaide 4

Climate Change Lakes Water Level Salinity Water Isotopic Composition Microfossil Assemblages Isotope Chemistry Sedimentary Structures Aeolian materials Lake Sediments Palaeo-Shorelines Groundwater Interaction

INTERACTIONS (JUST A FEW)

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LAKES

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LAKES

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CHIMBLE

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CHIMBLE 2015 - HYDROLOGICAL CALIBRATION

Water Level 138 140 142 144 146 148 150 152 154 156 158 160 162 Year 1885 1895 1905 1915 1925 1935 1945 1955 1965 1975 1985 1995 2005 2015 Modelled Lake Levels Historical Lake Levels Key Historical Levels 0.230 0.090 0.020 0.007 Soil thickness (Evapotranspiration)

Lake Bullen Merri

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CHIMBLE 2015 - ISOTOPIC EVOLUTION

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Meteorological Data

University of Adelaide 10

CHIMBLE

Groundwater Inflow Inflow Reservoir

Basin Morphology & Geology Model Parameters

Lake Stratification Salinity Evaporation Modifiers Thermal Evaporation Modifiers Lake Water Temperature Outseepage

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University of Adelaide 11

CHIMBLE

GROUND- WATER MODULE

Meteorological Data Basin Morphology & Geology Model Parameters

Lake Stratification Salinity Evaporation Modifiers Thermal Evaporation Modifiers Lake Water Temperature

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University of Adelaide 12

CHIMBLE

GROUND- WATER MODULE SALINITY MODULE

Meteorological Data Basin Morphology & Geology Model Parameters

Lake Stratification Thermal Evaporation Modifiers Lake Water Temperature

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University of Adelaide 13

Light Depth Extinction

CHIMBLE

GROUND- WATER MODULE SALINITY MODULE LAKE THERMAL MODULE

Meteorological Data Basin Morphology & Geology Model Parameters

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University of Adelaide 14

CHIMBLE

GROUND- WATER MODULE SALINITY MODULE LAKE THERMAL MODULE ECOLOGY MODULE

Future Project Meteorological Data Basin Morphology & Geology Model Parameters Underway: R & C++ 2D FDM

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University of Adelaide 15

CHIMBLE

GROUND- WATER MODULE

Meteorological Data Basin Morphology & Geology Model Parameters

Lake Stratification Salinity Evaporation Modifiers Thermal Evaporation Modifiers Lake Water Temperature

Underway: R & C++ 2D FDM

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2D FDM Specified head, head dependant and no flow boundaries. Topography, wells, ET, recharge, confined and unconfined aquifers, reservoirs/lakes. ~400x faster than Modflow.

CHIMBLE 2017 GROUNDWATER MODULE

Ankor, M J & Tyler, J T, submitted 2017

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Water Level 138 140 142 144 146 148 150 152 154 156 158 160 162 Year 1885 1895 1905 1915 1925 1935 1945 1955 1965 1975 1985 1995 2005 2015 Modelled Lake Levels Historical Lake Levels Key Historical Levels 0.230 0.090 0.020 0.007 Soil thickness (Evapotranspiration)

Lake Bullen Merri

CHIMBLE 2015 - HYDROLOGICAL CALIBRATION

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140 145 150 155 160

Lake depth over time

Time Depth 1889 1895 1901 1907 1913 1919 1925 1931 1937 1943 1949 1955 1961 1967 1973 1979 1985 1991 1997 2003 2009 2015

K = 1 Lake K = 0.0005 Soil Layer =0.115 PWF =0.3 Calcheck = 0.006, SD = 0.398 iHeads =BM Calibration/Bullen Merri Heads 1889 V4.txt Base =BM Calibration/DIATREME 50d and S108.grid

Lake Bullen Merri

CHIMBLE 2017 - COUPLED GROUNDWATER (PRELIMINARY)

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University of Adelaide 19

1978 1982 1987 1992 1997 1950 2015 2013 2008 2002 1978 1982 1987 1992 1997 1950 2015 2013 2008 2002

AERIAL PHOTOS

LAKE EDWARD LAKE LEAKE

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University of Adelaide 20

102 103 104 105 106 107 1950 1956 1962 1968 1974 1980 1986 1992 1998 2004 2010 2016 88 89 90 91 92 93 1950 1956 1962 1968 1974 1980 1986 1992 1998 2004 2010 2016

LAKE EDWARD WATER LEVELS 1950-2016 LAKE LEAKE WATER LEVELS 1950-2016

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University of Adelaide 21

MONITORING

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University of Adelaide 22

SUMMARY

Lake models are important for the interpretation of palaeoclimates from lake sediments, and for the projection of future changes in lake systems. Lake models may require significant complexity to effectively model the hydrologic, isotopic and chemical response of a lake to changes in climate. Long term monitoring programs are necessary to develop datasets for calibration of lake models.

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Imberger J. 1985 Sánchez-España J. et al. 2014

HONOURS 2015 - ISOTOPIC EVOLUTION