Ma1997

Référence

Ma, Y. (1997) Long term impact of patch clearcutting on peak flow. Mémoire de maîtrise, Université Laval.

Résumé

The interrelations of various hydrologic processes, watershed characteristics and different treatments justify this study of long term effects of patch cutting 31% of a 394 ha basin in Montmorency Fores, Quebec, Canada. All rainfall storm flows (150) above a threshold value (daily flow $\ge$0.5 m$\sp3$/s on basin 5D) were analyzed during the 8-year calibration period (35) and two consecutive eight years post-treatment periods (115). Quick and delayed flows were separated by a line drawn from the initial rise at a slope of 0.0055 L/(s.ha.h) until it intersected the falling limb of the hydrograph. The instantaneous rainfall peak flows did not change significantly (p $>$ 0.5) after logging. However, the small total storm flow volume in post-treatment II, and quick flow and delayed and delayed flow volumes during both treatment I and II periods (return period $\le$2.33 years) were significantly (p $<$ 0.08) decreased. Storm flow hydrograph lag, concentration, based and falling times tended to be reduced after logging. Longer lag times decreased significantly (p = 0.018) during the post-treatment I period while the concentration times tended to decrease during the post-treatment II period. Storm flow hydrograph rising time and falling time were not significantly reduced by logging. However, the base time which is the summation of the former times was reduced significantly (p = 0.095) during the post-treatment II period. The instantaneous snowmelt peak flows were not affected significantly (p $>$ 0.44) while the snowmelt storm flow volumes before peak were statistically different (p = 0.097). The higher flow volumes showed a tendency to increase. (Abstract shortened by UMI.)

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@MASTERSTHESIS { Ma1997,
    AUTHOR = { Ma, Y. },
    TITLE = { Long term impact of patch clearcutting on peak flow },
    SCHOOL = { Université Laval },
    YEAR = { 1997 },
    NOTE = { CEFTMS, Plamondon, A.P. and Prévost, L., Yuxi Ma. Thèse (de maîtrise) Pqdt Thèse (M.Sc.)--Université Laval, 1997. Bibliogr.: f. 68-74. En anglais avec résumé en français. Thèse. Foresterie et géodésie Plamondon, André P., directeur de thèse Prévost, Marcel, directeur de thèse },
    ABSTRACT = { The interrelations of various hydrologic processes, watershed characteristics and different treatments justify this study of long term effects of patch cutting 31% of a 394 ha basin in Montmorency Fores, Quebec, Canada. All rainfall storm flows (150) above a threshold value (daily flow $\ge$0.5 m$\sp3$/s on basin 5D) were analyzed during the 8-year calibration period (35) and two consecutive eight years post-treatment periods (115). Quick and delayed flows were separated by a line drawn from the initial rise at a slope of 0.0055 L/(s.ha.h) until it intersected the falling limb of the hydrograph. The instantaneous rainfall peak flows did not change significantly (p $>$ 0.5) after logging. However, the small total storm flow volume in post-treatment II, and quick flow and delayed and delayed flow volumes during both treatment I and II periods (return period $\le$2.33 years) were significantly (p $<$ 0.08) decreased. Storm flow hydrograph lag, concentration, based and falling times tended to be reduced after logging. Longer lag times decreased significantly (p = 0.018) during the post-treatment I period while the concentration times tended to decrease during the post-treatment II period. Storm flow hydrograph rising time and falling time were not significantly reduced by logging. However, the base time which is the summation of the former times was reduced significantly (p = 0.095) during the post-treatment II period. The instantaneous snowmelt peak flows were not affected significantly (p $>$ 0.44) while the snowmelt storm flow volumes before peak were statistically different (p = 0.097). The higher flow volumes showed a tendency to increase. (Abstract shortened by UMI.) },
    KEYWORDS = { Coupe à blanc Aspect de l'environnement Québec (Province) Forêt Montmorency Cours d'eau Jaugeage Québec (Province) Forêt Montmorency Forêts Influences Québec (Province) Forêt Montmorency Hydrologie forestière Québec (Province) Forêt Montmorency },
    OWNER = { brugerolles },
    TIMESTAMP = { 2008.01.17 },
}

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