Coarse sediment of the Yellow River in the complex erosion area of the Pisha sandstone region of the Ordos Plateau is deposited on the downstream riverbed, posing a threat to the flood control safety of the river. The objectives of the present study were to analyze the mechanisms of combined erosion and sediment yield under the synergistic action of multiple dynamics, employing the indoor artificial rainfall-wind-freezing-thawing cycle solid model test to explore the temporal and spatial variation of the coarse sediment production and the transportation process. In this study, complex erosion indoor tests were carried out through the artificial rainfall-wind-freezing-thawing cycle solid model. The enrichment rate (ER), fractal dimension, and median diameter (d₅₀) of soil particles were used to quantify the size distribution characteristics of sediment particles under different erosion dynamics. The coarse sediment was first transported in the process of soil erosion because of the special texture and terrain characteristics of Pisha sandstone soil. Moreover, the degree of heterogeneity of sediment under complex erosion was larger than that under water erosion. The effect of wind could aggravate the instability of the erosion dynamic system. Under the combined action of freezing-thawing, wind, and water, the particle size composition changed greatly, and the erosion energy was extremely unstable. The effect of complex erosion created conditions for the coarse sediment transportation. Under the freezing-thawing-wind-water combined action, the particle size of eroded sediment was the coarsest, and that of water erosion was the smallest. We concluded that the reason why the Pisha sandstone area has become the core area of the concentrated source of coarse sediment in the Yellow River is related not only to the special nature of the Pisha sandstone soil itself but also to the effect of complex erosion.

鄂尔多斯高原皮沙砂岩区复杂侵蚀区黄河粗大泥沙沉积在下游河床上，对河流防洪安全构成威胁。本研究的目的是分析多种动力协同作用下的侵蚀产沙联合机制，采用室内人工降雨-风-冻-融循环实体模型试验，探索粗颗粒的时空变化。沉积物的产生和运输过程。本研究通过人工降雨-风-冻-融循环实体模型进行复杂侵蚀室内试验。富集率 (ER)、分形维数和中值直径 ( d ₅₀) 的土壤颗粒被用来量化不同侵蚀动力学下沉积物颗粒的尺寸分布特征。由于皮沙砂岩土的特殊质地和地形特征，粗泥沙在水土流失过程中首先被输送。此外，复杂侵蚀下沉积物的非均质性程度大于水蚀下的沉积物。风的作用会加剧侵蚀动力系统的不稳定性。在冻融、风、水的共同作用下，粒度组成变化很大，冲刷能量极不稳定。复杂侵蚀作用为粗大泥沙输送创造了条件。在冻融-风-水共同作用下，侵蚀沉积物的粒径最粗，水蚀最小。我们得出结论，皮沙砂岩区之所以成为黄河粗泥沙集中源的核心区，不仅与皮沙砂岩土壤本身的特殊性有关，还与复杂的侵蚀作用有关。