翻译：卵砾石河床是指由卵石和小石子混合而成的河床。卵砾石河床具有不同于其他类型河床的特殊性质。其疏松的结构和粗糙的表面使得其在流体中的运动和沉积过程中扮演着特殊的角色。卵砾石河床的形态和动力学过程一直是水文学和地貌学中的重要研究领域。其中卵砾石河床局部冲刷模型试验研究是该领域的重要分支之一。1卵砾石河床局部冲刷模型试验研究是在实验室中建立小型河床试验模型通过模拟水流在河床中的冲刷过程研究卵砾石河床

Translation: A cobble-gravel riverbed refers to a riverbed composed of a mixture of cobbles and small stones. Cobble-gravel riverbeds have special properties that distinguish them from other types of riverbeds. Their loose structure and rough surface play a unique role in the movement and deposition of fluids. The morphology and dynamics of cobble-gravel riverbeds have always been important research areas in hydrology and geomorphology. Among them, the experimental study of local scouring models in cobble-gravel riverbeds is one of the important branches in this field. Local scouring model experiments on cobble-gravel riverbeds involve establishing small-scale riverbed test models in the laboratory to simulate the scouring process of water flow in the riverbed, studying the scouring characteristics, morphological evolution, and related properties of cobble-gravel riverbeds. The research results are of great significance for a deeper understanding of the formation and evolution of cobble-gravel riverbeds in natural environments and for improving relevant theoretical models in hydrology and geomorphology.

Keywords: cobble-gravel riverbed; riverbed scouring; geomorphology; hydrology