Atlantis

Subjects to cover in this page:

  • The input model for Atlans is constructed from the subsurface model, groundwater table and elevation data.

  • Time dimensions is categorized in terms of stress periods and time steps (Fig. 1 b). A stress period is the time during which a constant stress is applied (for example the surface water stage in a management area or a surcharge). Within a stress period, time is discretized into individual timesteps. A stress period therefore generally consists of multiple timesteps. A complete model simulation can consist of one or multiple stress periods which may all vary in duration.

  • In each time step, a consolidation, oxidation and shrinkage calculation is performed and the resulting loss in elevation due to each process is stored.

  • Core of Atlans are the Model and Simulation objects

  • Explanation of what the model consists of -> a collection of columns consisting of 4 types of columns -> groundwater, consolidation, oxidation and shrinkage columns (maybe include figure of this concept)

  • Explanation of a column. Only discuss the four components (gw, cons, ox, shr) briefly as this will be covered in the respective pages.

  • Current calculation methods which are supported by Atlans and including or ignoring these in the modelling

Fig. 1.. Schematic overview of the Atlans modelling framework. (a) representation of a single modelling cycle in a stress period. (b) Time discretization of the model in terms of stress periods and time steps. Adapted from Bootsma et al. (2020).

Model

The total model area is discretized by a grid of rectangalur cells. The cell size of the grid is depending on the input data and for all cells that have .

Fig. 2.. Main components of an Atlans subsurface model that is used for modelling simulations.

Column

Groundwater column

Consolidation column

Oxidation column

Shrinkage column

Simulation

Bootsma, H, H Kooi, and G Erkens. 2020. “Atlantis, a Tool for Producing National Predictive Land Subsidence Maps of the Netherlands.” Proceedings of the International Association of Hydrological Sciences 382: 415–20. https://doi.org/https://doi.org/10.5194/piahs-382-415-2020.