基于区域地下水埋深的基流分割方法及其应用

Baseflow Separation Method Based on Regional Distribution of Depth to Groundwater Table

数字滤波法是基流分割最常用的方法,但滤波参数与次数选择缺乏物理基础。基于流域地下水埋深观测资料,建立地下水埋深空间分布统计表述方法及其与基流量的关系表达式,并将其与数字滤波法相结合,以实测与模拟的地下水埋深拟合最优为目标,确定数字滤波法参数和滤波次数,并在淮河流域北部玄武子流域加以应用,为数字滤波法基流分割提供科学依据。

The digital filter method is the most used method for baseflow separation. However, this method lacks physical base in choice of the filter parameter and times. Based on observation data of depth to groundwater in study basin, the statistical expression of basin spatial distribution of the depth to groundwater and its relation to baseflow are established. This relation combined with digital filter method is used to determine the filter parameter and times in terms of the goal of best fitting between the simulated and observed depths to groundwater. The proposed method is applied in Xunwu sub-basin of Huai he River, which provides scientific base for the application of digital filter method in baseflow separation.