欢迎您！东篱公司
退出
-
申报数据库
-
立项数据库
-
成果数据库
-
项目获奖数据库
中文摘要：
基于东江流域57个站点1957～2010年逐月降雨数据，对比分析SPI和指数两种方法在流域旱涝等级划分中的应用，揭示流域近50a来旱涝时空分布特征及其变化趋势。结果表明：①SPI和Z指数两种方法计算旱涝指标所得结果差异度较小，均能较好地反映流域历史实际旱涝状况，Z指数对极端旱涝等级具有更好的指示作用；②近50a来，流域各年代旱涝交替明显，偏涝和重涝多于偏旱和重旱；③流域汛期、非汛期和全年旱涝分布形态在空间上有较好的一致性；④近50a来，流域总体上呈“北旱南涝”的旱涝变化趋势空间格局。
英文摘要：
Based on monthly precipitation data of 57 stations in the Dongjiang Basin in 1957-2010, compara- tive analysis of application of the classification of droughts and floods by SPI and Z index methods was did and spatial and temporal distribution characteristics of droughts and floods of the basin in recent 50 years in and its change trend were analyzed. The result showed that： 1） The result for the index of droughts and floods by the SPI method was close to that of the Z index method, which can reflect the actual state of droughts and floods in the basin under three time scales： the flood, non-flood season and the whole year. The Z index meth- od was better when it comes to the extreme droughts grade. 2） Alternating droughts and floods for each decade was obvious in the past 50 years. Floods and extreme floods were more than droughts and extreme droughts. 3） Spatial distribution patterns of droughts and floods in flood, non-flood season and the whole year were consis- tent and trends of droughts and floods in the south and north were opposite. The spatial distribution of droughts and floods in non-flood season was similar to that of the whole year. 4） On the whole, the Dongjiang Basin had a trend of floods in the south and droughts in the north in the future.
同期刊论文项目
同项目期刊论文
期刊信息
位置：