PrevostBarrySteinEtAl1989

Référence

Prevost, M., Barry, R., Stein, J., Plamondon, A.P. (1989) Evolution of the snow cover and of the soil hydrological and thermal profiles in a basin of the laurentidian balsam fir forest. Journal of Hydrology, 107(1-4):343-366.

Résumé

Physical characteristics of the snowpack (depth, water-equivalent, density temperature) and the thermal and hydrological profiles of the soil have been observed in the balsam fir ecosystem of the Lac Laflamine basin, during three accumulation and snowmelt seasons. A network of 85 sampling points of snow and soil water covering the basin was installed in 1985. Temperatures within the snow cover and at different levels in the soil were measured in a station installed on a southerly exposed slope of the basin. As on other forested sites, the high spatial variability of snow water-equivalent (coefficient of variation of 20% during accumulation and up to 56% during snowmelt) is attributed to snow interception by the crowns and to the redistribution on the ground of densified snow from the branches. The statistical analysis shows a higher accumulation of 1-7 cm water equivalent and a faster snowmelt in the upper part of the slopes and on the divide compared to the downslope stations. The detailed study of snow profiles indicates temperature gradients of 0.1-0.2°C cm-1 and strong density gradients in the snow cover. Because of the thermal properties of snow, the soil temperature remains above -2°C and the freezing depth lies between 40 and 60 cm in spite of air temperatures frequently reaching -30°C in January. The soil hydrological regime would indicate a porous frost during winter. © 1989.

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@ARTICLE { PrevostBarrySteinEtAl1989,
    AUTHOR = { Prevost, M. and Barry, R. and Stein, J. and Plamondon, A.P. },
    TITLE = { Evolution of the snow cover and of the soil hydrological and thermal profiles in a basin of the laurentidian balsam fir forest },
    JOURNAL = { Journal of Hydrology },
    YEAR = { 1989 },
    VOLUME = { 107 },
    PAGES = { 343-366 },
    NUMBER = { 1-4 },
    ABSTRACT = { Physical characteristics of the snowpack (depth, water-equivalent, density temperature) and the thermal and hydrological profiles of the soil have been observed in the balsam fir ecosystem of the Lac Laflamine basin, during three accumulation and snowmelt seasons. A network of 85 sampling points of snow and soil water covering the basin was installed in 1985. Temperatures within the snow cover and at different levels in the soil were measured in a station installed on a southerly exposed slope of the basin. As on other forested sites, the high spatial variability of snow water-equivalent (coefficient of variation of 20% during accumulation and up to 56% during snowmelt) is attributed to snow interception by the crowns and to the redistribution on the ground of densified snow from the branches. The statistical analysis shows a higher accumulation of 1-7 cm water equivalent and a faster snowmelt in the upper part of the slopes and on the divide compared to the downslope stations. The detailed study of snow profiles indicates temperature gradients of 0.1-0.2°C cm-1 and strong density gradients in the snow cover. Because of the thermal properties of snow, the soil temperature remains above -2°C and the freezing depth lies between 40 and 60 cm in spite of air temperatures frequently reaching -30°C in January. The soil hydrological regime would indicate a porous frost during winter. © 1989. },
    OWNER = { brugerolles },
    TIMESTAMP = { 2007.12.05 },
}

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