The study area is located in the middle reaches of the Baerdong River in Inner Mongolia.This study focused mainly on the dynamic geomorphological evolution caused by aeolian-fluvial joint erosion.Based on the field work and collecting the related data,the meteorological observation,runoff plot experiment,topographic survey and remote sensing analysis were applied to study the modern process of aeolian-fluvial joint erosion.The change of erosion pattern of different landforms and the evolution process of valley morphology were quantitatively analyzed.The results showed that the geomorphic types in the middle reaches of the Baerdong River are mainly the dunes on the river bed,valley slopes and terraces as well as the gullies on the terraces and alluvial fans.The erosion and morphologic evolution of these landforms repeat circularly in a year.Because of the periodic changes of wind speed and water regime,these aeolian-fluvial jointly eroded units have evolved regularly and controlled the change of valley landforms in the middle reaches of the Baerdong River for many years.The morphological changes could be mainly manifested in the river curvature,width of the river channel,shifting direction of the river channel,tilt direction of transverse section of riverbed,size of the alluvial fans and the migration distance of the sand dunes in valley.The study results could be referred in further researching and controlling soil erosion in the aeolian-fluvial joint erosion area.
MA Yu-feng
,
YAN Ping
,
YANG Yu-hui
,
LI Shuang-quan
. Valley Landform Evolution under Aeolian-Fluvial Joint Erosion in the Baerdong River Basin in Inner Mongolia,China[J]. Arid Zone Research, 2019
, 36(5)
: 1280
-1291
.
DOI: 10.13866/j.azr.2019.05.26
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