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以汾河上游为例,选取标准径流指数(SRI)为研究指标,分析上静游、汾河水库和兰村三座水文站1956~2000年实测年径流丰枯变化情况,基于SRI划分无旱、轻旱、中旱、重旱、特旱五个等级并获得了等级间的界限值,进而对汾河上游水文干旱等级进行了划分。结果表明,基于SRI的等级划分能够很好地反映汾河上游径流量的正偏性,在不同时间尺度下具有明显的一致性;中旱、重旱在汾河上游发生的概率较大,未来抗旱措施应主要集中在重旱区。
Taking the upper reaches of Fen River as an example, the standard runoff index (SRI) was selected as the research index to analyze the changes of measured annual runoff abundance and fluence during the period of 1956 ~ 2000 in Fenjing Reservoir and Lancun Hydrologic Station. , Mild drought, moderate drought, heavy drought and special drought and obtained the threshold between the grades, and then divided the upper reaches of the Fenhe hydrological drought level. The results show that the classification based on SRI can well reflect the positive deviation of runoff in the upper Fenhe River and have obvious consistency at different time scales. The probability of moderate drought and heavy drought occurring in the upper Fenhe River is greater, Drought relief measures should be mainly concentrated in arid areas.