Study Of The Evolution And Modeling Of Aeolians Dunes

Abstract

The objective of this work is to study the influence of sediment supply on the evolution and formation of sand dunes on a horizontal plane. The study on dune fields is complemented by work on an isolated dune or sand pile. Numerical simulations are conducted using ANSYS Fluent software, which employs the finite volume method of the Eulerian model. We have adopted a simplified approach by varying three characteristic parameters in our simulations: wind speeds, sand densities and their sizes. The results show that, without the addition of external sand, the duration of dune formation is determined by the amount of sand lost. The height of the dunes gradually decreases until their disappearance. High wind speeds intensify erosion: fine grains are easily lifted and transported in suspension, while larger grains primarily move by saltation and creep. This dynamic leads to a great diversity of dune shapes, influenced by sand density and wind intensity. Next, we used artificial intelligence to analyze and model the data from the results obtained during the simulations. To achieve this, the ANFIS neuro-fuzzy system is applied for modeling the height of sand dunes.