Continuous Modelling of Downstream River Erosion Caused by 40 Years of Urbanizationby William James, McMaster Univ, Hamilton, Ont, Canada,
Mark Robinson, McMaster Univ, Hamilton, Ont, Canada,
Abstract: The US EPA Stormwater Management Model (SWMM3) was installed on an IBM-PC compatible network. The adapted program, known as PCSWMM3, and incorporating a simple algorithm for modelling interflow, was run in continuous mode for a 43-year time series using a 1-hour integration period. The drainage basin was discretized and parameters fitted to simulate the birth, growth and full development of an urban area. Moving frequency analyses were carried out for various N-year contiguous time spans lagging by 1 year for each year in the time series. These N-year statistical flows were compared with the evolving downstream channel. Frequency analyses carried out over shorter time spans were found to produce variations in the high frequency flows which corresponded to periods of channel erosion. The results are compared to Leopold's Theory of dominant channel fluviology.
Subject Headings: Stormwater management | Rivers and streams | Hydrologic models | Computer models | Hydraulic models | Time series analysis | Drainage basins | Frequency analysis
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