库姆塔格沙漠南部的风积地貌特征

通过考察结果和TM影像解译,库姆塔格沙漠的东南分布高大的沙山,沙丘形态复杂;南部和西南缘分布有多条南北走向的荒漠沟谷,两岸分布沙垄,高18~65m,垄脊点(金字塔型)线交错,沙垄走向与沟的走向一致,阶地上覆盖一层深色矿物组成的砂砾(粒径3~1mm)。沙漠的中心区域,孤立的新月型沙丘、沙丘链占优势。下伏地形强烈影响着库姆塔格沙漠的风沙地貌形态。沙漠南部的低山、阿尔金山及其山前洪积沟谷形成的沟谷效应,塑造了沙漠南部复杂的地貌形态。沙漠沙丘砂的粒径由南向沙漠中心减小,0.25~0.05mm细砂占80%左右。

Geomorphology Characteristics of Wind-drift Sands in South of Kumtag Desert

According to the observation results,the landscapein southeastof Kumtag desert is complex;many gullies,that go with SN,distributein south and southwestof desert;Giant linear ridge with aridge of point(triplicity shape) line alongwith gully.The sand ridges are 18～65m high.The crescentic dunes and crescentic dunes chain are dominant in the centre area of desert.The gully,low massifs and Arjin Mountain take on importantrole in making up physiognomy of desert in south area of Kumtag desert.The diameters of sand grains of dunes gradually decreasefrom south to center of desert,and almost 80% of them are 0.25～0.05mm.