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Random Characteristics of Sediment-Laden Flows and the Techniques of Effective Sediment Exclusion on Dujiangyan Irrigation Project in China

by Shuyou Cao, Chengdu Univ of Science &, Technology, China,
Fang Duo, Chengdu Univ of Science &, Technology, China,
Jiayang Chen, Chengdu Univ of Science &, Technology, China,



Document Type: Proceeding Paper

Part of: Planning Now for Irrigation and Drainage in the 21st Century

Abstract:

The irrigation system is over 2,200 years old and discharges water at a rate of 340-740 m³/s from the Minjiang River. The average slope of the river bed slope above the Dujiangyan reach is 0.82% which produces high velocity flows and the transportation of large quantities of gravels and cobbles. Field observations and model experiments show that the techniques of effective sediment exclusion include the general layout of the three main hydraulic head works, the utilization of secondary currents in the channel bends and the annual maintenance work for each reach channel.

Subject Headings: Sediment | Sediment transport | River flow | Irrigation systems | Hydraulic structures | Hydraulic models | Hydraulic loads | China | Asia

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