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Interactive superposition effect of multi-dynamic erosion
in the Pisha sandstone area of the Yellow River basin

1，2 1 1 2 1
ZHANG Pan ，YAO Wenyi ，XIAO Peiqing ，LIU Guobin ，YANG Chunxia
（1. Key Laboratory of Soil and Water Conservation on the Loess Plateau of Ministry of Water Resources，
Yellow River Institute of Hydraulic Research，Zhengzhou 450003，China；
2. Research Center of Soil and Water Conservation and Ecological Environment，
Chinese Academy of Sciences and Ministry of Education，Yangling 712100，China）

Abstract： Identifying the interactive superposition effect of multi-dynamic erosion in Pisha sandstone area
is of great significance for further understanding the mechanism of soil erosion and sediment yield， provid⁃
ing scientific basis for soil erosion control and ecological restoration in Pisha sandstone area. Through the in⁃
door artificial rainfall， wind tunnel and freezing-thawing cycle solid model test， the interactive superposi⁃
tion effect of multi-dynamic erosion in Pisha sandstone area was studied. The results show that： single
freezing-thawing and wind erosion will not lead to significant increase of sediment yield， but will increase
the material source of hydraulic erosion. Only under the combined action of hydraulic and gravity driving
factors can the process of erosion and sediment yield be significantly affected. The presence of a weathered
layer on the surface of Pisha sandstone is an important factor affecting wind erosion and sand production.
The complex erosion process has a significant superimposed amplification effect，the superposition amplifica⁃
tion effect of "freezing-thawing-water erosion" and "freezing-thawing-wind-water erosion" are enlarged to
127% and 164% respectively. The superimposed amplification effect of erosion caused by multi-dynamic in⁃
teraction in Pisha sandstone area is one of the important reasons that makes it become the core source ar⁃
ea of coarse sediment in the Yellow River. Therefore，complex erosion is not a linear superposition of multi⁃
ple types of single-phase erosion，but has a significant nonlinear superposition amplification effect.
Keywords：freezing-thawing-wind-water erosion; multi-dynamic interaction; soil erosion mechanism; test sim⁃
ulation; Pisha sandstone area

（责任编辑：韩 昆）

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