| 单词 | barchan dune |
| 释义 | barchan dune[ bär-kän′ ] A large, crescent-shaped dune lying at right angles to the prevailing wind and having a steep, concave leeward side with the crescent tips pointing downwind. Barchan dunes form on flat, hard surfaces where the sand supply is limited. They can reach heights of up to 30 m (98 ft) and widths of 350 m (1,148 ft). See illustration at dune. Words nearby barchan duneBarce, Barcelona, Barcelona chair, B.Arch., barchan, barchan dune, bar chart, B.Arch.E., Barchester Towers, bar chord, bar clamp The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved. |
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