English Dictionary

barchan

/bɑː(ɹ)ˈkɑːn/

noun

An arc-shaped sand ridge comprising well-sorted sand.

The barchan is a type of sand dune that is crescent-shaped.

意味（1）

An arc-shaped sand ridge comprising well-sorted sand.

The sand is usually very well sorted in barchans, for it is constantly re-worked as the dune ‘marches’. The marching also causes cross-bedding inside the barchan, with a dip parallel to the sand-fall face.