Development and Geometric Similarity of Alluvial Deltas

Abstract

Movable bed experiments from a flume into a basin were conducted to study the development of alluvial deltas. The experimental setup was aimed at the bed-load mode. Results showed that the development of the delta can be divided into three stages. In the first stage, the delta progressed mainly in its length, and a successfully derived equation described the shape of the delta in this stage. In the second stage, the delta developed mainly in its width. The length, width, front thickness, and central thickness of the delta were used to scale the geometric similarity. The plane geometry of deltas can be described using Gaussian functions. Transverse and longitudinal profiles fit the hyperbolic and linear function, respectively. The length, width, and thickness of the delta deposition at the end of the second stage have their own maximum values,