Anna Jaros

Everything Should Be Made as Simple as Possible, But Not Simpler

attributed to Albert Einstein

Anna Jaros

MSc.(Tech.)

PhD candidate
Hydrology, Water Resources

Biography

 - - -

Research interests

  • Fully-integrated physically-based groundwater modelling
  • Groundwater – surface water interactions
  • Groundwater dependent ecosystems
  • Climate change
  • Wetland hydrology

PhD Project: Integrated modelling of northern groundwater systems

In my studies, I use fully-integrated groundwater-surface water modelling approach as a tool to study groundwater-surface water interactions processes within boreal groundwater dependent ecosystems (GDEs), i.e. the ecosystems which functions and structure depend on the presence of groundwater. The current EU and Finnish legislation require an assessment of the impacts of various land uses and groundwater abstraction to GDEs. However, our current state-of-the-art knowledge and modelling methodology are still insufficient to explain and simulate thoroughly mechanisms of all hydrological processes occurring within the GDEs and thus, challenges meeting these protection requirements.  Fully-coupled physically-based models used in this thesis solve groundwater and surface flow equations simultaneously and thus, they are excellent tools to study interactions between subsurface and overland flow domains and to provide us information how various GDEs will respond to changes in hydrological and climatic conditions.

Many groundwater dependent ecosystems, e.g. aapa mires, emerge as a result of regional groundwater flow paths, whereas others, such as springs, spring fens, are more local features. Thus, the thorough picture of groundwater-surface water interactions in northern conditions can be only revealed by studying these systems across various scales ranging from local systems to sub-catchment or regional ones. Until now, modelling studies mostly focused on small-scale applications. However, from water resource management and ecosystem protection perspective perhaps more valuable insight is provided by regional-scale studies. The largest difficulty in regional scale modelling is that the scrutinized characterization of extensive areas through in situ measurements is with current measurement technique challenging, if not impossible, due to a large spatial extent, remoteness and heterogeneity of such landscapes and thus, it emphasizes the importance of a proper model parametrization and calibration. This PhD project addresses aims to enhance understanding of the interactions between groundwater-surface water in boreal groundwater dependent ecosystems (GDEs) and addresses the issue of identifiability of model parameters related to modelling of both, local and large-scale groundwater systems using sensitivity analysis and uncertainty estimation methods. In order to decrease the main drawback of fully-integrated modelling approach i.e. long running times, I am utilizing high-performance scientific computing services.

The main objective of the PhD project is to answer the following research questions:

  •  How should integrated models be parametrized for simulations of large-scale boreal GDEs (Aapa mires)?
  •  How various peat layer representation affects groundwater-surface water interactions in peatlands?
  • What is the role of groundwater and surface water on the local carbon cycle in boreal mire ecosystems?

 

The research plan of this PhD thesis consists of the following research themes:

Theme 1:  Exploring parametrisation of an integrated groundwater-surface water model for a boreal aapa mire

Theme 2: Effect of peat representation in fully-integrated physically-based models on GW-SW interactions

Theme 3: Impact of northern mire hydrology on the local carbon cycle

 

Research groups

  • PhD Candidate, Water Energy and Environmental Engineering

Selected publications

  • Jaros, Anna; Rossi, Pekka M.; Ronkanen, Anna-Kaisa; Kløve, Bjørn (2016) Modelling wetland-groundwater interactions in the boreal Kälväsvaara esker, Northern Finland. (Abstrakti (Ei KOTAan)). - EGU General Assembly 2016. Geophysical Research Abstracts 18. -, EGU2016-12103. [Original]
  • Jaros, Anna; Rossi, Pekka M.; Ronkanen, Anna-Kaisa; Kløve, Bjørn (2017) The effect of a fully-integrated model parametrization on groundwater-surface interactions in boreal esker-mire landscape: example of the Olvassuo aapa mire in Finland. (Abstrakti (Ei KOTAan)). - 44th Annual Congress of the International Association of Hydrogeologists (IAH). “Groundwater Heritage and Sustainability” Dubrovnik, Croatia, September 25th to 29th 2017. Book of Abstracts. Posavec, Kristijan; Marković, Tamara. Ei sarjaa/No series, International Association of Hydrogeologists (IAH). 142, T3.1.2
  • Jaros, Anna; Marttila, Hannu; Lohila, Annalea; Aurela, Mika; Penttilä, Timo; Mäkinen, Risto; Vuorenmaa, Jussi; Rossi, Pekka M.; Ronkanen, Anna-Kaisa; Kløve, Bjørn (2017) Groundwater-surface interactions in a boreal forest-fen catchment – a modelling case study of Pallaslompolo, Finnish Lapland. (Abstrakti (Ei KOTAan)). - 44th Annual Congress of the International Association of Hydrogeologists (IAH). “Groundwater Heritage and Sustainability” Dubrovnik, Croatia, September 25th to 29th 2017. Book of Abstracts. Ei sarjaa/No series, International Association of Hydrogeologists (IAH). 401, T7.3.8