基于滦河流域滦县站1956 年- 2010 年日流量资料, 从流量、频率、历时、发生时间、变化率5 个方面考虑水文 情势变化, 选取了33 个水文变化指数( IH A) 和34 个环境流量指数( EFC) , 应用IH A 软件全面分析了这些指数在 人类活动干扰前后的变化特征, 以及与河流生态健康密切相关的河流情势的改变程度。以滦河流域为例, 应用 IH A 软件分析河流生态径流变化规律, 计算了水文特征值的量值、频率、历时、发生时间以及变化率5 个方面在人 类活动干扰前后的变化特征, 评估河流生态径流的33 个水文变化指数和34 个环境流量指数。结果表明, 人类活动 显著地改变了河流汛期高流量及其出现频率、极端低流量的量值与出现时间、高流量脉动次数和日流量的变化率等 水文要素, 而这些水文要素的改变可能是导致河流生态环境破坏的重要原因, 研究结果可为河流生态管理与修复提 供依据。

Based on the daily r unoff data at the Luanx ian stat ion in the Luanhe Riv er Basin f rom 1956 to 2010, the hydrolog ical variatio ns wer e analy zed fr om f ive respects including mag nitude, fr equency, timing , duratio n, and var iatio n rate. A to tal of 67 sta2 tist ical parameter s w ere selected, including 33 IHA parameter s and 34 EFC par ameters. Indicator s of H ydro log ic Alteratio n ( IH A) softw are was used to analyze the var iatio n characteristics o f these index es befo re and after the int erference o f human ac2 tivit ies, and the deg ree of alt eratio n o f t he r iver r egime closely related to the riv er ecosystem health. A case study in the Luanhe River Basin show ed that human activities have changed the hydrolog ical elements sig nificantly, such as the high flow and its f re2 quency in the flo od season, the mag nitude and t iming of ex tremely low flow, the fr equency o f hig h f low pulses, and the var iatio n rate of daily str eam flow s, and these changes in the hydro logical elements can mainly be attributed to the river ecolog ical envir onment destruction. The findings in this paper can pro vide the theoretical basis for r iver ecosystem manag ement and restoration.

水利部公益性项目( 201101017) ; 国家科技支撑计划项目( 2012501982) ; 中央高校基本科研业务费专项资金( 2014B34714)