On the flow of polythermal glaciers - I. Model and preliminary analysis

Many interesting phenomena have been observed in the flow of glacial ice masses. In order to establish a rational theory for the study of these phe­nomena, we develop here a detailed continuum model for the flow of poly­thermal (i. e. partially cold and partially temperate) glaciers in wide mountain valleys. As a first step in the analysis of the nonlinear double free boundary problem posed by this model, the structure and stability of solutions are studied in a particular very simple limiting situation. Further analysis is deferred to part II of the paper.