关键词: 沙丘各部位, 风蚀状况, 观测, 光电集沙仪, 毛乌素沙地

Abstract: Three hundreds and seventy thousands data for seven years on mega-dunes of Mu Us sandy land were observed by using three refitted French photoelectron sand collectors (automatically recorded once per 10 seconds). Based on these data and the corresponding wind velocity data, the vectorgraphes reflecting wind erosion and accumulation of sand-shifting flow were drawn at year, month, day, and hour scales. These have accurately described the concrete erosion/accumulation change on windward slop, top, leeward slope of barchan under the variant wind speeds. This experiment has filled the vacancy of field observation for a long period on the law of sand dune movement at home and abroad.

Key words: sand dune, wind erosion, observation