Many applications in geophysical fluid dynamics and natural hazards prediction require the development of domain decomposition methods (DDMs) either to optimally use the increasing computational power or to accurately simulate multi-physics phenomena. Due to the complexity of such numerical codes, additional constraints arise in the design of the numerical methods as for example in space-time discretizations, subgrid scale parameterizations, physical/numerical interfaces etc.. In this context, a compromise between effi cient numerical methods and their according constraints imposed by the target applications must be found. The aim of this mini-symposium is to bring together theoretical and applied scientists working on realistic environmental simulations.