On Non-Darcian Water Flow in Peat

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Abstract
The movement of water through mires is a controlling ecological factor, since the transport of solutes by advection can dominate nutrient fluxes, determine the growth rates or survival of plants, and profoundly influence peat redox status and decomposition rates. Modeling and measuring subsurface water flows in mires requires a second understanding of flow processes through peat. The existing literature suggests that such flow violates Darcey''s Law in humified peats, and casts doubt on the applicability of existing models for flow through porous media when applied to peatlands. A large component of the reported ''non-Darcian'' behavior of peat can be explained by the elastic properties of peat compression and the effective stress principle. Darcy''s Law remains an appropriate tool for use in wetland hydrologic modeling.

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