[Objective] Physical clogging of riverbeds is a common problem in seasonal rivers, which has a significant impact on groundwater recharge and river ecological restoration. Analyzing the infiltration and clogging characteristics of seasonal rivers and predicting the infiltration rate after the disconnection of the riverbed can provide a scientific basis for the subsequent optimization of river ecological restoration and water replenishment schemes. [Methods]Elected five types of riverbed materials (with median particle sizes d50 of 50, 100, 150, 300, and 600 μm) as media in the lower reaches of the Yongding River. A one-dimensional soil column infiltration simulation experiment was conducted using 6 g/L turbid water to analyze the characteristics of riverbed blockage and the transition law between saturated and unsaturated flow. A prediction model for riverbed infiltration process considering the influence of physical blockage was established. [Results] 1) The fine particle riverbed with a median particle size of 50 μm did not experience significant blockage, and the depth range of blockage in the 100～600 μm riverbed was 0～5 cm. The permeability coefficients decreased by 86%, 68%, 93%, and 94% respectively compared to the initial values. 2) The entire process of riverbed infiltration for a riverbed with a particle size of 50 μm is saturated seepage flow. For riverbeds with particle sizes ranging from 100 to 600 μm, the seepage flow transitions from saturated to unsaturated at 51.2 h, 9.6 h, 17.6 h, and 2.6 h respectively within the time range of approximately 2.6 to 51.2 h. The reduction in the infiltration rate is approximately between 15% and 30%. 3) A riverbed infiltration model considering the effect of blockage based on Darcy's law and coarse particle seepage formula was constructed. Model validation showed that the relative errors of the infiltration rates of four coarse particles (100～600 μm) riverbeds were 8.6%, 14.7%, 22.1%, and 36.6%, respectively, which increased with the increase of median particle size. [Conculsion] Fine sediment in muddy water has a relatively large impact on the clogging of coarse-textured riverbeds. The coarser the texture of the riverbed is, the more likely it is to transform into a disconnected riverbed. Scientifically understanding the infiltration-clogging laws of fine sediment in intermittent rivers with riverbeds of different textures is of great significance for the subsequent optimization of ecological water replenishment schemes.