Ice stupas are artificial glaciers defined by their inventors (the Ice Stupa Project) as “economical reservoirs of water for desert lands”. Their structure resembles a huge pyramid of ice (typically 40 m high and 20 m large), obtained by freezing small droplets of water. Their design allows a slow melting during spring and summer, ensuring a sustained water supply for agricultural purposes. During the internship, the first objective will be to produce experimental meter-size ice stupas in the cold chamber of the lab by spraying water droplets vertically onto a cold substrate in a cold atmosphere. The shapes obtained will be monitored over time, and the effect of various parameters such as flow rate, temperature, and size of droplets will be studied. A phase diagram of the observed ice structures will be constructed, and the processes by which these ice structures form will be studied theoretically. By alternating cold and warmer periods, certain melting patterns at the centimetre scale will be reproduced and studied. In the second stage, the optimal shape for delaying the melting of an ice object will be investigated. The melting time and the successive shapes of an initial object will be explored both experimentally and theoretically, taking into account thermal convection, diffusion, and radiations.