流域水文年及丰枯水期划分方法

研究流域水文年及丰、枯水期划分方法,为水文水利计算提供科学依据。通过分析流域径流变化特点,提出径流累计距平法。将该方法用于黑河上游流域,结果表明:该方法为黑河上游流域确定了合理的水文年及丰、枯水期;在不同水文年起讫日下,黑河上游流域年径流时间序列的统计特性和典型年的径流年内分配特征发生显著变化。因此,径流累计距平法可用于划分流域水文年及丰、枯水期,统一水文年划分方式对水文水利计算十分必要。

Method of Partitioning Water Year, Wet Season and Dry Season of River Basin

This paper studied a method of partitioning water year, wet season and dry season (WWD), so as to provide a scientific basis for the hydrological and hydraulic calculation of river basin. Initially, the cumulative anomaly of runoff time series was used to formulate the partition method of WWD on the basis of runoff characteristics. The upstream of the Heihe River Basin was taken as an example to validate the proposed method. The results show that the method determined the reasonable WWD of the river basin. In addition, the statistical properties of runoff time series and intra-annual runoff distribution of typical year had significant changes under different starting-and-ending time of water year. Therefore, the proposed partition method could be applied to determine WWD of a river basin, and unifying the partition method of water year is quite essential for the hydrological and hydraulic calculation.