摘要
利用衡阳盆地7个气象站1960—2013年的气温、降水等数据,应用趋势分析法、Mann-Kendall检验与ArcGIS技术研究了衡阳盆地气象干旱频率的时空演变特征。结果表明:衡阳盆地54 a的干旱频率呈缓慢增加趋势,年增幅为0.099 7%,其中轻旱与中旱频率呈缓慢降低趋势,而重旱与特旱频率明显上升;衡阳盆地气象干旱以秋季干旱的频率最大,为40.26%,春季干旱发生的可能性最小,其频率仅为9.84%;盆地中部的衡南县、西部的祁东县及西北部的衡阳县属于气象干旱高危险区,盆地北部的衡山县、东北部的衡东县、南部的常宁市与东南部的耒阳市为气象干旱的低危险区。该研究得出的气象干旱的时空规律与农业旱情的时空特征有较好的吻合性,因此,利用综合气象干旱指数诊断干旱等级对农业防旱抗旱有一定的指导意义。
Utilizing the daily meteorological datum of seven stations from 1960 to 2013 in Hengyang basin,such as temperature,precipitation and so on,this study investigated the temporal and spatial variation characteristics of meteorological drought frequency by using trend analysis,Mann-Kendall test analysis and Arc GIS technology. The results indicated that the frequency of drought presented a slowly increasing trend in the past 54 years in Hengyang basin,and the increase was 0. 099 7% each year,and the frequency of mild and moderate drought presented a slowly decreasing trend,but the frequency of severe and extreme drought increased significantly. The frequency of meteorological drought in Hengyang basin was significantly different,and it was the largest in autumn,which was40. 26 %,the possibility of meteorological drought in spring was minimal,it was only 9. 84%. The distribution of frequency suggested that the high dangerous regions of meteorological drought located in Hengnan County,Qidong County and Hengyang County,and the low dangerous regions of meteorological drought located in Hengshan County,Hengdong County,Leiyang County and Changning County. Temporal and spatial regularity of meteorological drought investigated in the article was in agreement with the temporal and spatial variation characteristics of agricultural drought. The methods of determining drought according to composite index of meteorological drought have certain instructive significance to prevent and fight drought.
出处
《华北水利水电大学学报（自然科学版）》
2016年第1期24-28,共5页
Journal of North China University of Water Resources and Electric Power：Natural Science Edition
基金
国家自然科学基金资助项目(41171075
71273081)
湖南省高校科技创新团队支持计划资助项目
湖南省重点学科人文地理支持项目
关键词
气象干旱频率
综合气象干旱指数
时空演变
衡阳盆地
meteorological drought frequency
composite index of meteorological drought
spatial-temporal variation
the Hengyang basin
