非一致水文条件下的永定河生态需水研究

Research on the Ecological Water Demand of the Yongding River under Inconsistent Hydrological Condition

针对永定河流域天然径流显著衰减现象,利用基于分布式水文模型的SWAT技术,采用现状下垫面条件下的2006—2015年降水径流资料率定水文模型参数,通过1980—2015年降水过程演算现状下垫面条件下长系列天然径流过程,从而解决了水文系列的不一致性问题。利用修正后的水文系列,采用Tennant法核算了永定河山区典型断面的生态基流过程,可作为永定河生态需水管控的下限。

Regarding the significant attenuation of natural runoff in the Yongding River Basin,this paper uses the SWAT technology based on distributed hydrological model,applies the precipitation runoff data from 2006 to 2015 under the current underlying surface to calibrate the hydrological model parameters,and calculates the natural runoff process from 1980 to 2015 under the current underlying surface through the precipitation process from 1980 to 2015,so as to solve the inconsistencies in hydrological series.Using the modified hydrological series and Tennant method,the ecological base flow process of typical sections in the Yongding River Mountain Area is calculated,which can be used as the lower limit of ecological water demand control of the Yongding River.