太平洋西海岸森林砍伐对洪水特征的影响

据加拿大Carnation Creek生态试验站20a的森林水文观测资料,应用回归分析和协方差检验,研究了森林砍伐以前、道路修筑、砍伐中和砍伐后各时期洪水参数的变化,统计结果表明,森林砍伐后,洪峰和洪量有显著的增大,一般增幅在20％～30％之间,年径流量增长15％～20％,但洪峰滞时和洪水形态变化不大。

THE EXPLORATION OF LOGGING IMPACTS ON STORMFLOW CHARACTERISTICS IN WEST PACIFIC COAST WATERSHED

In the paper the regression and covariance analysis are used to assess difference in stormflow parameters for both logged and controlled watersheds. A new storm separating method is proposed to deal with multi-peak storm processes. 21 years storm data of Carnation Creek, West Pacific Coast are investigated to explore the logging influences on storm runoff features. The statistic analysis shows that the timber harvesting will significantly increase the peak and volume of stormflow, but does not obviously affect to lag time and the shape of storm hydrograph.