## 6 Discussion
In the middle of the profile, they increase as we move east and in the eastern part of the profile, they obtain significant values that oscillate around 1 m.
* The W2 profile line is located in the northern part of the research area and is in the vicinity of a part of the town that has been quite well examined in terms of ground surface movements (leveling, GNSS measurements). This is an area which is placed over the central part of the deposit, which has been showing uplifts for years, as has already been discussed intensively in this work [26]. The changes in the height of the terrain profile presented in the figure also show the dominance of uplifts, but changes with significant values also appear at the beginning of the profile and in the 300-400 m section (Figure 10). In turn, in the 100-200 m section of the profile, significant changes with negative values can be noticed. The distribution of topographic height changes is strongly related to the height distribution of the geological profile of the morphology of the salt rock roof. A certain discrepancy is visible: the elevated part of the topographic profile shows a local depression, which may be the result of underground erosion. This depression is not shown, however, in the geological profile. * The W3 profile line is a line running longitudinally through zones of sinkholes which occurred in the past and whose locations are associated with the activity of underground waters flowing in underground valleys and in tunnels in the gypsum cap at the top of the dome, and flowing in a direction from north to south (see the section \"Geoenvironmental setting\"). The distribution of the changes in topographic heights shows a strong correlation with the height distribution of the geological profile, but only within the 500-1100 m section of the profile (Figure 11). Earlier, in the northern part of the profile, the mutual incompatibility of data distribution of the changes is visible. In this part, no height changes can be observed in each of the analyzed time intervals. For the 1978-2018 time interval, in the southern half of the profile line, negative changes in height are visible (on average about \(-0.5\) m), and are visible over the area of shallow underground exploitation and sinkholes. In the final part of the profile, the changes in height are found to be positive (on average, about \(-0.5\) m). * In both periods (1978-1998 and 1998-2018) the changes are similar for most of the W4 profile. In the western part of the profile, an increase in subsidence is visible as it moves eastwards. Where the profile line passes over the workings of the old, shallow exploitation, a cessation of height changes is visible (Figure 12). This profile line in the further part of the profile, immediately after passing over the above-mentioned workings, reappears and shows similarly high values of 0.5 m, but only for the second period. In the first period, the changes are slight. In the longer term (1978-2018), changes in elevation on the part of the profile above those mentioned are also positive, but they are small values. It can be assumed that the entire area of the deposit, with the exception of the flooded parts of the rock mass, is subject to erosion, which is manifested by subsidence on the surface. While the profile shows a residual gravity anomaly as an effect after the previously mentioned 1907 disaster, no changes in height correspond to the gravitational effect (Figure 13). Figure 9: The topographical profiles of the ground surface in the particular years with the profile line of the top surface of the salt deposit. The plot at the top shows the height changes along the W1 profile line in the analyzed time intervals. Figure 10: The topographical profiles of the ground surface in the particular years with the profile line of the top surface of the salt deposit. The plot at the top shows the height changes along the W2 profile line in the analyzed time intervals.