黄河流域砒砂岩区多动力侵蚀交互叠加效应研究

识别砒砂岩区多动力侵蚀的叠加效应,对于深化认识砒砂岩区土壤侵蚀与产沙机理,为黄河粗泥沙来源区水土流失治理及砒砂岩区生态恢复等实践提供科学依据具有重要意义.通过室内人工降雨-风洞-冻融循环实体模型试验研究了砒砂岩区多动力侵蚀交互叠加效应.试验结果表明:单一的冻融、风蚀作用不会导致坡面产沙量的明显增加,而是增加了水力侵蚀的...

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

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, providing scientific basis for soil erosion control and ecological restoration in Pisha sandstone area. Through the indoor artificial rainfall, wind tunnel and freezing-thawing cycle solid model test, the interactive superposition 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 amplification 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 interaction in Pisha sandstone area is one of the important reasons that makes it become the core source area of coarse sediment in the Yellow River. Therefore, complex erosion is not a linear superposition of multiple types of single-phase erosion, but has a significant nonlinear superposition amplification effect.