PlamondonLevesqueYuxiEtAl1998

Reference

Plamondon, A.P., Lévesque, D., Yuxi, M., Prévost, M. (1998) Long term effects of forest mosaic management on storm and snowmelt flow, Québec. In Hydrology in a changing environment.. (Wheater, H. et Kirby, C., Eds.) John Wiley and Sons, Toronto, pages 503-516. British Hydrological Society.

Abstract

This study reports the long term effects on storm flow after patch cutting 31% of a 394 ha basin in Montmorency Forest, Québec, Canada. It represents a sample of the mosaic forest management which consists in maintaining 1/3 of the stands in regeneration, immature and mature states over landscape units. All rainfall storm flows (150) above a threshold value (daily flow ≥ 0.5 m3 s-1 on basin 5D) were analysed during the 8-year calibration period (35) and post-logging I and II made of two consecutive eight years periods (115). Quick and delayed flows were separated by a line drawn from the initial hydrograph rise at a slope of 0,0055 l s-1ha-1h-1 until it intersected the falling limb. The instantaneous rainfall peak flows did not changed significantly (p > 0.5) after logging. However, the small (return period ≤ 2.33 years) total storm flow volume in post-logging II, and quick flow and delayed flow volumes during both post-logging I and II were significantly (p < 0.08) decreased. Storm flow hydrograph lag, concentration, base and falling times tended to be reduced after logging. Longer lag times decreased significantly (p = 0.018) during post-logging I while the concentration times tended to decrease during post-logging II. Storm flow hydrograph rising and falling times were not significantly reduced by logging but the base time which is their summation was reduced significantly (p = 0.095) during post-logging II. This change may explain the decrease of small storm flow volumes. The instantaneous snowmelt peak flows were not affected significantly (p > 0.44) while the larger snowmelt cumulative flow volumes before peak were significantly (p = 0.097) increased.

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@INPROCEEDINGS { PlamondonLevesqueYuxiEtAl1998,
    AUTHOR = { Plamondon, A.P. and Lévesque, D. and Yuxi, M. and Prévost, M. },
    TITLE = { Long term effects of forest mosaic management on storm and snowmelt flow, Québec. },
    BOOKTITLE = { Hydrology in a changing environment. },
    YEAR = { 1998 },
    EDITOR = { Wheater, H. et Kirby, C. },
    PAGES = { 503-516 },
    ORGANIZATION = { British Hydrological Society },
    PUBLISHER = { John Wiley and Sons, Toronto },
    ABSTRACT = { This study reports the long term effects on storm flow after patch cutting 31% of a 394 ha basin in Montmorency Forest, Québec, Canada. It represents a sample of the mosaic forest management which consists in maintaining 1/3 of the stands in regeneration, immature and mature states over landscape units. All rainfall storm flows (150) above a threshold value (daily flow ≥ 0.5 m3 s-1 on basin 5D) were analysed during the 8-year calibration period (35) and post-logging I and II made of two consecutive eight years periods (115). Quick and delayed flows were separated by a line drawn from the initial hydrograph rise at a slope of 0,0055 l s-1ha-1h-1 until it intersected the falling limb. The instantaneous rainfall peak flows did not changed significantly (p > 0.5) after logging. However, the small (return period ≤ 2.33 years) total storm flow volume in post-logging II, and quick flow and delayed flow volumes during both post-logging I and II were significantly (p < 0.08) decreased. Storm flow hydrograph lag, concentration, base and falling times tended to be reduced after logging. Longer lag times decreased significantly (p = 0.018) during post-logging I while the concentration times tended to decrease during post-logging II. Storm flow hydrograph rising and falling times were not significantly reduced by logging but the base time which is their summation was reduced significantly (p = 0.095) during post-logging II. This change may explain the decrease of small storm flow volumes. The instantaneous snowmelt peak flows were not affected significantly (p > 0.44) while the larger snowmelt cumulative flow volumes before peak were significantly (p = 0.097) increased. },
}

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