时间尺度对入库径流基流分割影响的初步研究

Influence of Time Scale on Baseflow Separation of Reservoir Inflow

以湖北省漳河灌区内非岩溶发育的杨树垱水库小流域和广西桂林市分布有岩溶发育的青狮潭水库流域为研究对象,利用数字滤波技术对杨树垱水库的日径流、旬径流和月径流量,以及青狮潭水库的月径流、季径流和年径流量进行基流分割。结果表明:随着时间尺度的增大,基流分割得出的基流指数呈逐渐增大的趋势。杨树垱水库小流域日径流的基流指数Fr比旬径流与月径流的Fr小,青狮潭水库月径流的基流指数Fr比季径流与年径流的Fr小。杨树垱水库入库径流的基流指数小于青狮潭水库。

A small watershed, the catchment of the Yangshudang reservoir, in Zhanghe irrigation area located in Hubei Province and the catch- ment of the Qingshitan reservoir in Guangxi Zhuang Autonomous Region were selected as the study area. And the digital filter technology was used to the baseflow separation for the runoff based on the daily inflow runoff of the Yangshudang reservoir and the monthly inflow runoff of the Qingshitan reservoir. The results show that the baseflow index Fr increase along with the growing of the time scale. The baseflow index Fr of daily runoff is smaller than that of ten days and monthly runoff in catchment of the Yangshudang reservoir, and the baseflow index Fr of monthly runoff is smaller than that of seasonal and annual runoff in the Qingshitan reservoir. Also baseflow index Fr of inflow runoff in the Yangshudang reservoir, a non-karst area is smaller than that in the Qingshitan reservoir.