长岭县干旱特征分析研究

利用吉林省长岭县1956—2005年降水量、蒸发量、土壤含水量等气象、水文资料对长岭县干旱特征进行研究。根据气象干旱指标、农业干旱指标、水文干旱指标、社会经济干旱指标,对长岭县气象、水文资料包括降水量趋势、降水量距平百分率、降水蒸发比、土壤含水量、水文干旱指数及社会经济需水与供水进行分析,得出长岭县的干旱特征。结果表明:长岭县干旱以气象干旱为主;1956—2005年共发生6次气象干旱,平均每7~8年发生1次;季节性气象干旱平均每2年发生1次;每3~4年出现1次水文干旱;社会经济干旱决定于用水量的多少,可人为调节。

Research on the Characteristics of Drought and Its Trend in Changling County

Using the meteorological and hydrological data of 1956—2005 annual precipitation,evaporation and soil moisture content,drought characters of Changling were studied.Taking meteorological drought index,agricultural drought index,hydrology drought index and social economic drought index as the foundation,the meteorological and hydrological data of Changling county were analyzed,the drought characters were ultimately obtained,including precipitation trend analysis,precipitation above-regions percentage,the ratio of precipitation and evaporation,soil moisture content analysis,hydrology drought index analysis,water requirement and water supply of social economy analysis.Meteorological drought was predominant in Changling county,6 times during 1956—2005,occurring once every 7 to 8 years;hydrological drought occurred once every 3 to 4 years;social economy could be regulated depending on water consumption.Drought characters obtained through the interdisciplinary analysis have certain application value to local society and economy and reference value to drought research.