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将国内外应用较广的数字滤波法和分布式水文模型SWAT相结合,在进行基流时间特征分析的基础上,通过修正基流退水系数α、模型效率评价、重新运行模型、GIS空间插值和趋势分析等方法,创新性地实现了基流空间特征的可视化表达。研究结果表明:1 2001~2012年灞河流域年均基流指数(BFI)为0.43,总体呈增加的趋势。年降水量与年径流、年基流均呈明显的正相关关系,与年基流指数呈明显的负相关关系;2基流年内变化较为稳定,在时间上存在秋季>春季>夏季>冬季、汛期>非汛期的关系。枯水期的基流指数高达0.78,表明基流是枯水期河流的主要补给来源;3灞河流域基流在空间上表现为自东南向西北、自上游向下游逐渐增加的趋势,这种空间分异规律是由流域的地势和河流流向决定的。
Based on the analysis of the base flow time characteristics, the digital filtering method and the distributed hydrological model SWAT, which are widely used both at home and abroad, are combined. Through the correction of the basal return coefficient α, the model efficiency evaluation, the re-operation model and GIS spatial interpolation And trend analysis and other methods, the innovative realization of the base flow spatial features of the visual expression. The results show that: 1 From 2001 to 2012, the average base flow index (BFI) in the Bahe River Basin is 0.43, showing an overall increasing trend. The annual precipitation was significantly positively correlated with annual runoff and annual base flow, and had a significant negative correlation with annual base flow index. (2) There was a stable change in base flow year, Flood season> non-flood season. The base flow index of dry season reached as high as 0.78, indicating that base flow was the main source of recharge for the rivers in dry season. The spatial distribution of base flow in the Three-tang River basin was from southeast to northwest and increased gradually from upstream to downstream. It is determined by the topography of the river basin and the flow of the river.