平滑最小值法与数字滤波法在流域径流分割中的应用比较

将平滑最小值法和2种数字滤波法应用于三峡水库的日入库流量的基流分割,比较了3种方法的基流分割效果.结果表明,数字滤波法优于平滑最小值法,所得的地下径流更平滑,更符合流量过程线退水段的物理规律;拥有2个参数的数字滤波器对总径流序列的高频信号的平滑作用要优于拥有1个参数的数字滤波器,所获得的地下径流序列更为稳定,变化性小,更适用于三峡大坝坝址以上的大流域的基流分割.

A Comparison between Smoothed Minimma and Digital Filtering Methods Applied to Catchment Baseflow Separation

The smoothed minimma and 2 digital filtering methods were applied and compared in this research to conduct baseflow separation on inflows to the Three Gorges Dam.The results show that first of all,in general,the digital filtering methods are superior to the smoother minima method,in obtaining smoother baseflows and better matching the physical mechanisms of the recession limbs of the hydrographs.Secondly,the digital filter with 2-parameter is superior than that with only 1 parameter.The baseflows obtained f...