基于年径流的水文干旱指标研究

水文干旱是一种机理复杂、影响深远的干旱现象,相对于气象干旱往往受到的关注较少。基于偏态分布概率的方法,描述水文干旱过程,利用年径流计算水文干旱指标——标准径流指数,建立了评价水文干旱等级的标准。结果表明,修正后的标准径流指数能够准确反映汾河上游水文干旱的情况,优于常规指标,并且能为干旱预警提供依据。

Hydrological Drought Index Based on annual Runoff

Hydrological Drought is a complex and influential phenomenon of drought; it tends to be less concerned with respect to meteorological drought. In view of skewed probability distribution, the process of hydrological drought is described. Hydrological drought index—Standardized Runoff Index is calculated with annual runoff dates, and evaluation criteria of hydrological drought is established. The results show that the corrected Standard Runoff Index reflects the hydrological drought accurately in upstream of Fenhe River and superior to conventional indicators. By the way, it provides the basis for drought early warning.