Development and geometric similarity of alluvial deltas

Chjeng-Lun Shieh, Chih Ming Tseng, Shaohua Marko Hsu

Research output: Contribution to journalArticlepeer-review

10 Citations (Scopus)

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 Succesfully 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. Tranverse and longitudinal profiles fit the hyperbolic and linear function, respectively. The length, width, and thickness of the deltas deposition at the end of the second stage have their own maximum values, Rc, Bm, and Zf. respectively, for each case. The total volume V of sediment deposition could be simply related to these maximum values by V = αRcbmZf + β with shape parameters α and β around 0.178 and 174. The third stage was characterized by the interactions between the delta development and stream-channel variations. The ratios of the delta slope to the channel slope were closely related to the occurence condition of the stream channel. Finally, the temporal variations of stream channels were investigated qualitatively.

Original languageEnglish
Pages (from-to)17-29
Number of pages13
JournalJournal of Hydraulic Engineering
Volume127
Issue number1
DOIs
Publication statusPublished - 2001 Jan 1

All Science Journal Classification (ASJC) codes

  • Civil and Structural Engineering
  • Water Science and Technology
  • Mechanical Engineering

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