Fig. 2. Root density distributions (dimensionless) used in the simulated scenarios. For the standard scenario (top), a horizontally homogeneous distribution is linearly decreasing from the soil surface toward 40-cm depth. The scenario with wedge-shaped insertions of roots between the inclined spoil layer structures (middle) has additionally narrow seams of roots parallel to the spoil layers down to 90-cm soil depth. The root distribution scenario at the bottom uses measured root density data.