基于霍顿下渗能力曲线的流量过程线连续分割方法研究

A Continuous Hydrograph Separation Method Based on Horton Infiltration Capacity Curve

在用前期影响雨量代替流域蓄水量的基础上,提出了基于霍顿下渗能力曲线的流量过程线的连续分割方法。选择西峡、猴子岩和东湾三个流域的降雨径流资料,采用该方法对流量过程线进行分割,并与现行的数字滤波法、非线性水库法和Boussinesq方程法相比较。结果表明,该方法具有一定的物理基础、符合产汇流基本规律,而且能够减少涨洪段流量过程线分割的主观性,对于流域时段单位线和降雨径流关系的推求均有重要的意义。

A new continuous baseflow hydrograph separation method based on the Horton infiltration capacity curve and antecedent precipitation index was proposed and developed. Rainfall-runoff data from three watersheds located in different climatic regions of China were selected and used as case studies. Three recent baseflow separation methods, digital filter, nonlinear reservoir and Boussinesq equation, were chosen as parallel schemes to compare with the proposed method. Test and application results indicate that the proposed baseflow hydrograph separation method is in accordance with the hydrological physical process. The proposed method can reduce some of the subjective aspects for the rising limb of the baseflow hydrograph, and is useful for unit hydrograph analysis and for the study of the rainfall runoff relationship.