Non-Darcian transmission of water in certain humified peats
1985; Elsevier BV; Volume: 82; Issue: 3-4 Linguagem: Inglês
10.1016/0022-1694(85)90025-3
ISSN1879-2707
AutoresJ. Waine, Jim Brown, H. A. P. Ingram,
Tópico(s)Soil and Unsaturated Flow
ResumoAbstract Laboratory permeameter tests were conducted on moderately humified peat samples to investigate apparent non-Darcian flow behaviour previously reported from seepage tube experiments. The laboratory tests were carried out for hydraulic gradients in the range 1.5–17.5 The mean head could be varied independently. Seepage velocity was found to increase more than proportionally with hydraulic gradient i . A flow relationship of the Swartzendruber type fitted the data, which showed a tendency for the apparent hydraulic conductivity K ( i ) to approach a limiting value at large hydraulic gradients. Subsidiary investigations suggested a slight influence of mean head on K ( i ) at constant hydraulic gradient, showed the mire water to be essentially Newtonian, and established that the non-Darcian behaviour is insensitive to temperature.
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