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Full-Text Articles in Physical Sciences and Mathematics
Flow Resistance Dynamics In Step-Pool Stream Channels: 1. Large Woody Debris And Controls On Total Resistance, Andrew C. Wilcox, Ellen E. Wohl
Flow Resistance Dynamics In Step-Pool Stream Channels: 1. Large Woody Debris And Controls On Total Resistance, Andrew C. Wilcox, Ellen E. Wohl
Geosciences Faculty Publications
Flow resistance dynamics in step-pool channels were investigated through physical modeling using a laboratory flume. Variables contributing to flow resistance in step-pool channels were manipulated in order to measure the effects of various large woody debris (LWD) configurations, steps, grains, discharge, and slope on total flow resistance. This entailed nearly 400 flume runs, organized into a series of factorial experiments. Factorial analyses of variance indicated significant two-way and three-way interaction effects between steps, grains, and LWD, illustrating the complexity of flow resistance in these channels. Interactions between steps and LWD resulted in substantially greater flow resistance for steps with LWD …
Flow Resistance Dynamics In Step-Pool Channels: 2. Partitioning Between Grain, Spill, And Woody Debris Resistance, Andrew C. Wilcox, Jonathan M. Nelson, Ellen E. Wohl
Flow Resistance Dynamics In Step-Pool Channels: 2. Partitioning Between Grain, Spill, And Woody Debris Resistance, Andrew C. Wilcox, Jonathan M. Nelson, Ellen E. Wohl
Geosciences Faculty Publications
In step-pool stream channels, flow resistance is created primarily by bed sediments, spill over step-pool bed forms, and large woody debris (LWD). In order to measure resistance partitioning between grains, steps, and LWD in step-pool channels we completed laboratory flume runs in which total resistance was measured with and without grains and steps, with various LWD configurations, and at multiple slopes and discharges. Tests of additive approaches to resistance partitioning found that partitioning estimates are highly sensitive to the order in which components are calculated and that such approaches inflate the values of difficult-to-measure components that are calculated by subtraction …