Answer
Based on your description of the sand dune's surface with wave-like ridges, the term commonly applied to such features is "barchan dune."
A barchan dune is a crescent-shaped sand dune with horns pointing downwind. It has a gentle slope on the windward side and a steeper slope on the leeward side. The wave-like ridges or undulations are known as "dune ripples" or "dune scallops." These ripples form on the dune's surface due to the interaction between the wind and the sand, with the sand particles being moved and rearranged by the wind.
Regarding the prevailing wind direction, it can be determined based on the orientation of the crescent-shaped dune. Barchan dunes are typically formed by winds that are relatively consistent in direction. The horns of the barchan dune point downwind, indicating the direction from which the prevailing wind is coming. Therefore, if the wave-like ridges or dune ripples are pointing towards the left of the image, the prevailing wind direction is most likely from the left. Conversely, if they are pointing towards the right, the prevailing wind direction is likely from the right.
Keep in mind that sand dunes and their features can vary depending on local conditions, but the description provided above is generally applicable to barchan dunes in many desert environments.
Work Step by Step
Based on your description of the sand dune's surface with wave-like ridges, the term commonly applied to such features is "barchan dune."
A barchan dune is a crescent-shaped sand dune with horns pointing downwind. It has a gentle slope on the windward side and a steeper slope on the leeward side. The wave-like ridges or undulations are known as "dune ripples" or "dune scallops." These ripples form on the dune's surface due to the interaction between the wind and the sand, with the sand particles being moved and rearranged by the wind.
Regarding the prevailing wind direction, it can be determined based on the orientation of the crescent-shaped dune. Barchan dunes are typically formed by winds that are relatively consistent in direction. The horns of the barchan dune point downwind, indicating the direction from which the prevailing wind is coming. Therefore, if the wave-like ridges or dune ripples are pointing towards the left of the image, the prevailing wind direction is most likely from the left. Conversely, if they are pointing towards the right, the prevailing wind direction is likely from the right.
Keep in mind that sand dunes and their features can vary depending on local conditions, but the description provided above is generally applicable to barchan dunes in many desert environments.
