呼伦湖流域水文干旱评价

摘要

Based on the monthly stream flow date of 2 representative hydrologic stations of Alatanemole Station and Kunduleng Station in the Hulun Lake basin during the period of 1971⁃2010, this paper calculated Stream Flow Drought Index ( SDI) . Runs theory was used to analyze the Stream Flow Drought Index ( SDI) , getting the drought duration and droughts intensity in Hulun Lake basin. The results indicate that the drought in Hulun Lake basin occurs mainly in autumn and winter. With the ageing change, the average drought duration and drought intensity of Alatanemole Station and Kunduleng Station are all in the growth state;after entering into 21 century, drought becomes frequently, drought intensity and drought duration become larger.%以呼伦湖流域2个水文站阿拉坦额莫勒站和坤都冷站1971—2010年的月径流量资料为基础，计算了流域的径流干旱指数，同时运用游程理论对径流干旱指数进行了分析，进而得到呼伦湖流域的干旱历时和干旱烈度。结果表明：呼伦湖流域干旱主要发生在秋季和冬季；随着年代的变化，阿拉坦额莫勒站和坤都冷站平均干旱历时和平均干旱烈度均呈增长状态；进入21世纪以后，呼伦湖流域干旱频发，且持续时间长、干旱烈度大。