Longitudinal Channel Response Due to In-Stream Mining

by George K. Cotton, CRSS Commercial Group, Inc, Phoenix, United States,
Vannop Ottozawa-Chatupron, CRSS Commercial Group, Inc, Phoenix, United States,



Document Type: Proceeding Paper

Part of: Hydraulic Engineering

Abstract:

This paper describes the analysis procedure developed for the Arizona Department of Transportation for the estimation of short-term longitudinal channel response due to in-stream mining. The model, which is modular in design, includes routines for a water balance within the excavation, combined subcritical and supercritical flow regimes, alluvial channel roughness, sediment transport, bed adjustment, and bed armoring. The model was calibrated using data from mined river reaches in sandbed and gravelbed channels throughout Arizona. Simulations were conducted to create several synthetic datasets from which general dimensionless relations were developed. Formulas for the maximum depth and length of scour upstream and downstream of an in-stream excavation for a flood hydrograph could then be determined.

Subject Headings: Alluvial channels | Rivers and streams | Scour | River and stream beds | Excavation | Channels (waterway) | Channel flow | Arizona | United States

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