Artikkelit jotka sisältää sanan 'shear strength'
Effect of peat harvesting on peat hydraulic properties and runoff generation.
Avainsanat:
peatlands;
Drainage;
runoff generation;
hydrological pathways;
hydraulic conductivity;
shear strength;
soil loss;
subsidence;
peak runoff
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Tekijä
Peat hydraulic conductivity, shear strength, plant composition and runoff at seven peat harvesting sites in Central Finland were measured. A large variation in hydraulic conductivity (10–8–10–6 m s–1 ), peat shear strength (302–413 kPa), and peak runoff (97–898 l s–1 km–2 ) was observed between different harvesting sites. The hydraulic conductivity showed a clear correlation with peat shear strength (r = –0.89), which has not been previously observed. The correlation between hydraulic conductivity and degree of humification was weak (r = 0.60). Soil lowering decreased the hydraulic conductivity and the peat shear strength. These reductions, with reduced drainage depths, increased peak flow and changed runoff generation patterns by increasing the possibility of Horton and saturation excess overland flow.
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Kløve,
Jordforsk, Norwegian Centre for Soil and Environmental Research, 1432 Ås, Norway
Sähköposti:
ei.tietoa@nn.oo
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