摘要
利用海河流域104个测站逐日降水资料,研究了海河流域过去47年中降水极值时空变化趋势,从降水极值变化的角度解释了海河流域旱涝的演变特征。结果表明:近47年来,海河流域的降雨量、小雨日数、暴雨日数、湿涝事件、日最大降水量均表现出明显减少趋势,干旱事件表现出显著增加趋势,加剧了海河流域干旱化程度。海河流域降水极值空间变化趋势在大部分区域表现为干旱化倾向,尤其是在海河流域东南部区域干旱化程度最为显著。降水的极值变化致使降水时空分布变得更加不均匀,使得海河流域干旱事件发生频率和强度增加,从而对流域内生态、环境和社会经济系统产生深远的影响。
Based on 104 stations with complete daily precipitation records during 1961-2007,the trend of the temporal and spatial variations of the precipitation extremes in the Haihe River basin was investigated,and the causes of intensifying drought disasters and variation of flood disasters from the viewpoint of the change in precipitation extremes were analysed. The result shows that,in recent 47 years,there are obvious decreasing trends in the annual rainfall amount,light rain days,rainstorm days,severe wetness,and maximum daily precipitation,but a significant increasing trend in severe drought duration in the Haihe River basin. All of these are accompanied with intensifying drought disasters. The spatial variability of the precipitation extremes trends in most regions of the Haihe River basin shows a drying tendency,especially in the semi-arid southeastern region where the most significant trend can be found. The changes of spatial and temporal distribution of the precipitation extremes have become more asymmetric,which might be one of the main causes of the higher frequency and enhanced intensity of drought,and have far-reaching effects on the eco-environment and social-economic systems in the Haihe River basin.
出处
《气候与环境研究》
CSCD
北大核心
2010年第4期451-461,共11页
Climatic and Environmental Research
基金
国家科技支撑计划课题2007BAD69B02
2007BAC29B02
河北省科技厅重点基础研究项目08966711D
水利部公益性行业科研专项200801001
关键词
海河流域
降水极值
时空变化
变化趋势
Haihe River basin
precipitation extremes
temporal and spatial variation
change trend
