A sequential modelling approach to assess groundwater–surface water resources in a snow dominated region of Finland

Okkonen, Jarkko; Kløve, Bjørn

doi:10.1016/j.jhydrol.2011.09.038

Cited by 61 publications

(40 citation statements)

References 36 publications

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“…The climate simulation data for the 30 year period 1971-2000 were used for comparison with the measured data for Hanko obtained from FMI. The Delta approach was used for the transfer process between present climate and scenario data [12,44,48,49]. For comparison, two climate parameters (temperature and precipitation) from the A1B and B1 scenario data were grouped into two 30 year time spans: 2021-2050 and 2071-2100.…”

Section: Climate Data and Climate Change Scenariosmentioning

confidence: 99%

“…Then the monthly time steps transient flow model was calibrated to groundwater levels during 2001-2010. The RMSE (root mean squared error), MAE (mean absolute error), and model bias were estimated based on [64] and [44]. The mean RMSE for residual between simulated and observed heads during 2001-2010 was 0.56 m, MAE was 0.49 m, and bias was −0.11 m. Figure 6 shows the spatial distributions of mean hydraulic head residuals-differences between simulated and observed heads from observation wells during 2001-2010.…”

Section: Groundwater Flow Model and Model Calibrationmentioning

confidence: 99%

“…The impact of soil frost on water infiltration was considered to be minimal, because according to [42] infiltration into the Hanko aquifer can take place even at a surface temperature of −2 °C. In cold, snow-dominated regions, the impact of soil frost on water infiltration is generally an issue, but in permeable, sandy aquifers recharge can occur even in partially frozen soil [43,44]. The groundwater simulation results based on future climate (precipitation, temperature, and sea level rise) scenarios (A1B and B1) were then compared with present day climate conditions, in order to evaluate the potential change in groundwater resources in the future.…”

Section: Introductionmentioning

confidence: 99%

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Impacts of Future Climate Change and Baltic Sea Level Rise on Groundwater Recharge, Groundwater Levels, and Surface Leakage in the Hanko Aquifer in Southern Finland

Luoma

Okkonen

2014

Water

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Abstract:The impact of climate change and Baltic Sea level rise on groundwater resources in a shallow, unconfined, low-lying coastal aquifer in Hanko, southern Finland, was assessed using the UZF1 model package coupled with the three-dimensional groundwater flow model MODFLOW to simulate flow from the unsaturated zone through the aquifer. The snow and PET models were used to calculate the surface water availability for infiltration from the precipitation data used in UZF1. Infiltration rate, flow in the unsaturated zone and groundwater recharge were then simulated using UZF1. The simulation data from climate and sea level rise scenarios were compared with present data. The results indicated changes in recharge pattern during 2071-2100, with recharge occurring earlier in winter and early spring. The seasonal impacts of climate change on groundwater recharge were more significant, with surface overflow resulting in flooding during winter and early spring and drought during summer. Rising sea level would cause some parts of the aquifer to be under sea level, compromising groundwater quality due to intrusion of sea water. This, together with increased groundwater recharge, would raise groundwater levels and consequently contribute more surface leakage and potential flooding in the low-lying aquifer. OPEN ACCESSWater 2014, 6 3672

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Section: Climate Data and Climate Change Scenariosmentioning

confidence: 99%

Section: Groundwater Flow Model and Model Calibrationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Impacts of Future Climate Change and Baltic Sea Level Rise on Groundwater Recharge, Groundwater Levels, and Surface Leakage in the Hanko Aquifer in Southern Finland

Luoma

Okkonen

2014

Water

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“…In any 152 case, future climate scenarios projected by GCMs in terms of precipitation and temperature may 153 be used to force hydrological models and numerical groundwater flow models in a sequential 154 (e.g. Okkonen and Kløve, 2011) or fully coupled manner (Therrien et al, 2007) Singh 1997), but eventually resulting in lower summer flow as glaciers retreat (Huss 2011 …”

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confidence: 99%

“…Reduced soil frost result in more recharge and less overland flow (Okkonen and Kløve 2011 To understand the impacts of climate change on ecosystems, we must understand all pressures …”

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confidence: 99%

Climate change impacts on groundwater and dependent ecosystems

Kløve

Ala‐aho

Bertrand

et al. 2014

Journal of Hydrology

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496

267

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Semianalytical series solutions for three-dimensional groundwater-surface water interaction

Ameli

Craig

2014

Water Resour. Res.

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A semianalytical grid-free series solution method is presented for modeling 3-D steady state free boundary groundwater-surface water exchange in geometrically complex stratified aquifers. Continuous solutions for pressure in the subsurface are determined semianalytically, as is the location of the water table surface. Mass balance is satisfied exactly over the entire domain except along boundaries and interfaces between layers, where errors are shown to be acceptable. The solutions are derived and demonstrated on a number of test cases and the errors are assessed and discussed. This accurate and grid-free scheme can also be a helpful tool for providing insight into lake-aquifer and stream-aquifer interactions. Here it is used to assess the impact of lake sediment geometry and properties on lake-aquifer interactions. Various combinations of lake sediment are considered and the appropriateness of the Dupuit-Forchheimer approximation for simulating lake bottom flux distribution is investigated. In addition, the method is applied to a test problem of surface seepage flows from a complex topographic surface; this test case demonstrated the method's efficacy for simulating physically realistic domains.

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A sequential modelling approach to assess groundwater–surface water resources in a snow dominated region of Finland

Cited by 61 publications

References 36 publications

Impacts of Future Climate Change and Baltic Sea Level Rise on Groundwater Recharge, Groundwater Levels, and Surface Leakage in the Hanko Aquifer in Southern Finland

Impacts of Future Climate Change and Baltic Sea Level Rise on Groundwater Recharge, Groundwater Levels, and Surface Leakage in the Hanko Aquifer in Southern Finland

Climate change impacts on groundwater and dependent ecosystems

Semianalytical series solutions for three-dimensional groundwater-surface water interaction

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