Modelling hydraulics of flow-path cuts through dense vegetation in a northern Everglades wetland Online publication date: Mon, 30-Jul-2018
by Kyle R. Douglas-Mankin; Donatto D. Surratt
International Journal of Hydrology Science and Technology (IJHST), Vol. 8, No. 3, 2018
Abstract: Flow-path cuts through dense marsh vegetation can dominate wetland hydraulics. The friction equation, including Manning's, provides simple, effective modelling of flow velocity, but this was the first study to apply the friction equation to wetland flow-cut hydraulics. Side-facing acoustic Doppler velocity and channel geomorphologic data were collected at seven locations on three shallow airboat flow-cuts and one deeper canoe trail in the Everglades. Data were fitted to the friction equation using friction (a), water depth (b), and water surface slope (c) parameters. Manning's form of the friction equation (b = 1.67, c = 0.5) was inappropriate to simulate shallow, low-gradient flow-cuts. The best overall statistical performance for describing flow-cut hydraulics was a = 3.18 × 107 m0.72 d−1, b = 1.28, c = 1.00 for airboat trails and a = 1.39 × 107 m0.72 d−1 for the canoe trail. Two applications are presented to demonstrate use of these models to quantify impacts of flow-cuts.
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