WDPM: the Wetland DEM Ponding Model
Date
2021
Authors
Shook, Kevin R.
Spiteri, Raymond
Pomeroy, John
Liu, Tonghe
Sharomi, Oluwaseun
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Open Journals
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Abstract
The hydrography of the Canadian Prairies and adjacent northern US Great Plains is unusual in that the landscape is flat and recently formed due to the effects of pleistocene glaciation and a semi-arid climate since holocene deglaciation. Therefore, there has not been sufficient energy, time, or runoff water to carve typical dendritic surface water drainage networks in many locations. In these regions, runoff is often detented and sometimes stored by the millions of
depressions (known locally as “potholes” or “sloughs”) that cover the landscape.
Conventional hydrological models are unable to simulate the spatial distribution of ponded
water in prairie basins dominated by depressional storage. When the depressions are filled, the
detented water may overflow to another depression, through a process known as “fill and spill”
(Spence & Woo, 2003). Therefore, the fraction of a depression-dominated prairie basin that
contributes flow to the outlet changes dynamically with the state of water storage within the
basin. The WDPM simulates the spatial distribution of ponded water, as it is added, removed
or drained, and can be used to calculate the changing connected/contributing fraction of a
prairie basin.
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Keywords
Wetland DEM Ponding Model, spatial distribution of ponded water, digital elevation model, water fluxes
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DOI
10.21105/joss.02276