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为研究潮沟发育演变动力机制,建立了以江苏中部粉砂淤泥质潮滩-潮沟系统为原型的降比尺物理模型,模拟在潮汐作用下,潮沟系统从平坦滩面逐渐形成、发育演变至动态平衡状态的过程,并分析了潮沟系统在不同阶段的形态特征。研究结果表明:潮沟系统发育速率先快后慢,最终达到动态平衡状态。采用潮沟发育各阶段潮沟系统的总长度与终态潮沟总长度的比值以及潮沟及其相邻处潮滩的高程变化速率两种方法,均可以衡量潮沟系统的发育程度。潮沟系统发育达到动态平衡后,各级潮沟个数占潮沟总数量的比例基本固定。潮沟的宽度、深度、宽深比均符合对数正态分布。潮沟的宽度与宽深比、深度与宽深比之间均具有幂函数关系。
In order to study the dynamic mechanism of development and evolution of tidal creek, a physical model of reduced scale based on the silt tidal flat-tidal channel system in central Jiangsu Province was established. Under tidal conditions, the tidal channel system gradually formed and developed from the flat beach surface Evolved to the process of dynamic equilibrium state, and analyzed the tidal channel system at different stages of the morphological characteristics. The results show that the tidal-gully system grows faster and then slower and finally reaches the dynamic equilibrium state. By using the ratio of the total length of the tidal channel system to the total length of the tidal channel at each stage of tidal channel development and the rate of the elevation change of the tidal channel and its adjacent tidal flat, the development of the tidal channel system can be measured. After the development of tidal gully system reached dynamic equilibrium, the proportion of tidal ditches at all levels in the total number of tidal flats was basically fixed. The width, depth and aspect ratio of the troughs are logarithmic normal distribution. The width and width-depth ratio of the trenches, the depth-to-width-depth ratio all have a power function relationship.