- Updated steady state solver
- Updated euler explicit solver
- Nearest neighbor interpolation introduced to wind series interpolation. This avoids awkward values of wind directions.

Both solvers eliminate the iteration of the linear system of equations. Performance of these solvers looks very good so far.

No compatibility with spatially varying wind fields yet. Solvers only work when winds are located in 1 quadrant.

Sweeping method 2 has been introduced to facilitate spatially varying wind field. The solver seems not mass-conserving yet.

Duran grainspeed improved, such that us and un are 0 when ustar < uth

Fixed usage of threshold mask. 2D mask can be given as input and will be used to mask uth for each fraction over a loop

The addition of a vegetation-growth mask allows to disable vegetation growth at certain parts of the domain (for instance where vegetation species are non-burial resistant)

1. Included grain speed us & un from both upwind and current cell
2. Grain speeds determined at cell edge instead of center (now fluxes for mass conservation (and asymmetry))

When calling 'duran_full' under the grainspeed parameter, now the grainspeed equation (eq 1.61 in thesis Duran) is completely solved. This results in better outcomes for steep slopes. Implications for earlier simulations, e.g. barchans, parabolics is expected to be limited, but for more natural situations (mainly blowouts) this has a large (positive) impact on the outcomes.

solver could be optimized for speed
boundary conditions are still under development.

 into deVries2023

Most functionalities are operational but some work remains on the boundaries.

sweep3 is the new solver code. This is tested for continuity on all quadrants.

Sweep tests folder is added. This folder is to be deleted later.

- make facility for using supply file
- nearest interpolation of wind input
- sweep stopping criteria 1e-10 instead of 0

Vegetation.py updated, but not a definite version. Processes are missing and implementation is lacking. Waiting for a better description, before a clean and "final" implementation

Allow messy input files