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基流是枯水期河川径流的主要来源,是一种比较稳定的径流组成部分,对于干旱内流河流域水文模拟和水资源开发利用至关重要。本文基于1979年-2008年莺落峡水文站的实测流量资料,采用数字滤波法中的单参数数字滤波法和递归数字滤波法对内陆河流域黑河上游的流量过程进行了基流分割研究。探讨了黑河上游年基流量和基流指数BFI的年内与年际变化特征,以及不同水平年基流指数BFI变化规律。研究表明,黑河上游基流量年内变化为先增后减,峰值出现在8月份,基流指数则是先减后增,6月份最小。受气温升高和融雪径流影响,黑河上游基流量年际变化呈增加趋势,而基流指数呈减少趋势。在不同水平年,枯水年份的平均基流指数BFI为0.577,平水年为0.551,丰水年为0.521。
Base flow is the main source of river runoff in dry season, which is a relatively stable part of runoff. It is very important for hydrological simulation and water resources development and utilization of arid inflow river basin. Based on the measured flow data of Yingluoxia Hydrological Station from 1979 to 2008, the single-parameter digital filtering method and recursive digital filtering method in digital filtering method are used to study the base flow segmentation of the upstream Heihe River in inland river basins. The annual and annual variations of annual base flow and base flow index (BFI) in the upper reaches of the Heihe River were studied, and the regularity of base flow index BFI in different levels was also discussed. The research shows that the base flow in the upper reaches of the Heihe River increased first and then decreased in the year, the peak appeared in August, the base flow index decreased first and then increased, and the lowest in June. Affected by the temperature increase and snowmelt runoff, the interannual variation of the base flow in the upper reaches of the Heihe River increased with the decrease of the base flow index. In different years, the average base flow index (BFI) of dry year was 0.577, that of flat water year was 0.551, and that of good water year was 0.521.