地表风化作用对楼兰地区雅丹地貌发育的影响

doi:10.12118/j.issn.1000-6060.2018.06.15

Abstract

Abstract: Wind erosion is the key controlling factor for the development of Yardang landforms,however,other factors may also play an important role in certain situation.In this paper,we analyzed the possible influence of weathering to the development of Yardang landforms based on the field investigation and lab experiments.The results suggested that multiple types of Yardang landforms can be found in Lop Nur region,Xinjiang Province,China.In Loulan region the Yardang landforms without vegetation cover are all relative short and small, they are all developed on the sediment rock that form mainly in Holocene.The clayey siltstones strata of the Yardang landforms in Loulan region are all hard under dry condition (>20 kg·cm^-2) and with strong resistance to wind erosion. However the top layers (~15 cm) of clayey siltstones are softening obviously (<10 kg·cm^-2).This is mainly caused by the combination of the small amount but centralized rainfall, the moisture condensation causing by the diurnal temperature variation and the intense solar radiation.Softening of clayey siltstone on the top of Yardang strata indicates that weathering on the surface of Yardang landforms is obvious faster than wind erosion.The firstly weathering on the Yardang landforms promotes the wind erosion and accelerates the development of Yardang landforms in Loulan region.Therefore,weathering has direct and important influence to the development of Yardang landforms in the study region.

Key words: Yardang, weathering, wind erosion, Lop Nur

CLC Number:

P931.3

LIN Yong-chong, MU Gui-jin, QIN Xiao-guang, TANG Zi-hua, LI Wen, XU Li-shuai. Weathering impact on the development of Yardang landforms in Loulan region[J].干旱区地理, 2018, 41(6): 1278-1284.

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Weathering impact on the development of Yardang landforms in Loulan region

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