Parameterisation of an integrated groundwater-surface water model for hydrological analysis of boreal aapa mire wetlands

Jaros, Anna; Rossi, Pekka M.; Ronkanen, Anna‐Kaisa; Kløve, Bjørn

doi:10.1016/j.jhydrol.2019.04.094

Cited by 13 publications

(6 citation statements)

References 88 publications

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“…Understanding how these complex peat processes might behave due to land use changes is crucial for hydrological modeling and sustainable management. Modeling water and solute transport under unsaturated conditions using the available hydrological models (e.g., HYDRUS, HydroGeoSphere, DRAINMOD) requires proper parameterization of the soil water retention curve (SWRC) and the hydraulic conductivity function (Jaros et al., 2019; Weber et al., 2017a). However, the broader literature on peat properties is incomplete.…”

Section: Introductionmentioning

confidence: 99%

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Hydraulic and Physical Properties of Managed and Intact Peatlands: Application of the Van Genuchten‐Mualem Models to Peat Soils

Menberu

Marttila

Ronkanen

et al. 2021

Water Resources Research

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Peatlands are unique ecosystems, which, in pristine condition, provide many ecological functions and ecosystem services, such as carbon sequestration, water regulation, and biodiversity. Globally, peatlands cover only 3% of the earth's land surface (about 400 million ha), but contain one-third of the global soil carbon pool (Greenup et al., 2000;Krimly et al., 2016). The northern hemisphere contains around 87% of global peatland resources (Strack, 2008), with the greatest peatland cover in boreal and arctic landscapes. For example, about 30% of total Finnish land area (9.15 million ha) is peatland (Turunen, 2008). However, 14%-20% of global peatland resources have been affected by anthropogenic disturbances (Strack, 2008). In Finland alone, around 55% of the total peatland area has been used for forestry (Peltola et al., 2014), around 0.8% for agriculture, and 2% for peat extraction purposes (Heikkilä et al., 2012).The biogeochemical processes in peatlands are controlled primarily by peat moisture content (Weiss et al., 1998), which is in turn controlled by the water table depth (Asmuß et al., 2019). The water table interacts with soil organic carbon, which is a significant determinant of soil-organic-carbon dynamics (Ise et al., 2008). Reduced water levels are thought to increase oxygen availability in the surface soil, resulting in faster organic matter decomposition and, as a result, increased peat density (Laiho, 2006). Hydraulic properties are highly significant in explaining water, energy, and carbon exchange between the land surface and the atmosphere (Montzka et al., 2017). By nature, peat soils are extremely complex, porous media with a high degree of vertical and lateral heterogeneity. From an agricultural, forestry, and ecological perspective, effective management of peat soils requires a good understanding of the processes that control water flow and storage at a particular site (Schwarzel et al., 2006). Understanding how these complex peat processes might behave due to land use changes is crucial for hydrological modeling and sustainable management. Modeling water and solute transport under unsaturated conditions using the available hydrological models

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Section: Introductionmentioning

confidence: 99%

“…(e.g., HYDRUS, HydroGeoSphere, DRAINMOD) requires proper parameterization of the soil water retention curve (SWRC) and the hydraulic conductivity function (Jaros et al, 2019;Weber et al, 2017a). However, the broader literature on peat properties is incomplete.…”

mentioning

confidence: 99%

Hydraulic and Physical Properties of Managed and Intact Peatlands: Application of the Van Genuchten‐Mualem Models to Peat Soils

Menberu

Marttila

Ronkanen

et al. 2021

Water Resources Research

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“…Increasing rainfall intensity (Sillmann et al, 2013;Ouranos, 2015) could also modify recharge patterns throughout the year (Fu et al, 2019;Dubois et al, 2022). Jaros et al (2019) and Autio et al (2020) argued that aquifer-peatland interactions are best studied using integrated groundwater-surface water flow model. However, this type of model requires an extended data set that was not available in this study, for example storage coefficients for the organic and mineral materials, and continuous transient state surface flow rate data at the outlet.…”

Section: Model Advantages and Limitationsmentioning

confidence: 99%

Aquifer-Peatland Hydrological Connectivity and Controlling Factors in Boreal Peatlands

et al. 2022

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The conditions in which groundwater inflow occurs in boreal peatlands and its contribution to peatland water balance are still poorly understood. The objectives of this research were to quantify the hydrological connectivity between a surficial aquifer and a peatland, and to identify the controlling factors in boreal peatlands of north-central Quebec (Canada). The peatlands were instrumented with piezometers and groundwater levels were monitored during two growing seasons. Hydraulic conductivities were measured on peat cores and in situ, groundwater inflows and outflows were calculated using the Darcy equation. The peatland water budgets were simulated for the two peatlands with a steady-state groundwater flow model to verify flow hypotheses, to quantify unmeasured flows and to explore recharge scenarios leading to changes in connectivity. The two peatlands have contrasted water budgets, with recharge representing the largest inflow (78%) and subsurface runoff representing the largest outflow (85%) the peatland with the smallest catchment area (Misask). The peatland with the largest catchment area (Cheinu) is also located downgradient within the regional watershed. Its inflows are dominated by groundwater (56%) and its outflows are mostly towards subsurface runoff (74%). The two peatlands are in conditions of precipitation excess and a recharge reduction would not affect their peatland heads markedly (<10 cm). However, recharge changes could induce larger modifications in groundwater inflows and outflows for the peatland with a larger catchment area. The dominating peatland hydrological functions are thus contrasted at the two sites, and it is hypothesized that the water table depths thresholds triggering changes between storage, transmission and runoff functions are also different. Although further studies remain to be done to understand how hydrological conditions change through time, and ultimately what are the long-term impacts of a changing climate on hydrology, vegetation and carbon accumulation, this work shows that understanding peatland hydrology requires to consider hydrological conditions beyond the peatland limits.

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“…Elsewhere, partial differential equation‐based, spatially distributed, fully‐integrated (or fully‐coupled) surface‐subsurface models are becoming more popular; reported applications now span a considerable range of research questions, environmental settings, and spatial scales (Ala‐aho et al., 2015; Hwang et al., 2018; Jaros et al., 2019; Maxwell et al., 2015; Smerdon et al., 2007; Sulis et al., 2011; Tolley et al., 2019). These codes can mechanistically simulate most relevant hydrological processes including two‐dimensional (2D) surface flow, three‐dimensional (3D) variably‐saturated groundwater flow, and evapotranspiration in a physically‐based, distributed, transient, and internally coherent fashion.…”

Section: Introductionmentioning

confidence: 99%

Simulating Fully‐Integrated Hydrological Dynamics in Complex Alpine Headwaters: Potential and Challenges

Thornton

Therrien

Mariethoz

et al. 2022

Water Resources Research

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Parameterisation of an integrated groundwater-surface water model for hydrological analysis of boreal aapa mire wetlands

Cited by 13 publications

References 88 publications

Hydraulic and Physical Properties of Managed and Intact Peatlands: Application of the Van Genuchten‐Mualem Models to Peat Soils

Hydraulic and Physical Properties of Managed and Intact Peatlands: Application of the Van Genuchten‐Mualem Models to Peat Soils

Aquifer-Peatland Hydrological Connectivity and Controlling Factors in Boreal Peatlands

Simulating Fully‐Integrated Hydrological Dynamics in Complex Alpine Headwaters: Potential and Challenges

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