Geochemical and hydraulic modeling of cavernous structures in potash seams Salt deposits offer a variety of usage types. These include the mining of rock salt and potash salt as important raw materials the storage of energy in man made underground caverns and the disposal of hazardous substances in former mines. The most serious risk with any of these usage types comes from the contact with groundwater or surface water. It causes an uncontrolled dissolution of salt rock which in the worst case can result in the flooding or collapse of underground facilities. Especially along potash seams cavernous structures can spread quickly because potash salts show a much higher solubility than rock salt. However as their chemical behavior is quite complex previous models do not account for these highly soluble interlayers. Therefore the objective of the present thesis is to describe the evolution of cavernous structures along potash seams in space and time in order to improve hazard mitigation during the utilization of salt deposits.