Bjørn Kløve

Effect of peat harvesting on peat hydraulic properties and runoff generation

Kløve B. Effect of peat harvesting on peat hydraulic properties and runoff generation.

Tiivistelmä

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.

Avainsanat
peatlands; Drainage; runoff generation; hydrological pathways; hydraulic conductivity; shear strength; soil loss; subsidence; peak runoff

Vastaanotettu 31.10.2017 Julkaistu 1.1.2000

Katselukerrat 1108

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