摘要
基于唐山地区1957—2011年的气象资料,比较分析标准化降水指数(S SPI)、标准化降水蒸散发指数(S SPEI)和帕默尔水文干旱指数(P PHDI)3种不同干旱指数的相关性,并评价了各个指数在唐山地区连旱期间的适用性。结果表明:各时间尺度(年、季、月)的S SPI和S SPEI均显著相关;P PHDI与年尺度的S SPI和S SPEI均显著相关。P PHDI对长期干旱判断效果明显优于短期干旱。年尺度S SPEI和S SPI对干旱事件识别效果比较接近,二者对长期干旱判断偏涝,对短期干旱判断效果明显优于P PHDI。在气温偏低的年份,季尺度的S SPI能很好地反映旱情的严重程度,在气候变暖的背景下,季尺度S SPEI比S SPI更能准确地判断和评价旱情。
Based on meteorological data from 1957 to 2011 in the Tangshan region,correlation analysis between the standardized precipitation index（SSPI）,the standardized precipitation evapotranspiration index（SSPEI）,and the Palmer hydrological drought index（ P PHDI） was conducted,and the applicability of these indices to drought evaluation of the Tangshan region during a continuous drought period was investigated.The results are as follows：the SSPI and SSPEI show good correlation at different time scales（monthly,seasonal,and yearly）; the P PHDI is significantly correlated with the S SPI and S SPEI at an annual scale; the P PHDI can detect multiple-year continuous drought better than short-term drought,while the annual SSPEI and SSPI can identify separate drought events better than the P PHDI; the seasonal S SPI can detect drought well in the years with low air temperature; and the seasonal SSPEI is more sensitive to the drought induced by the rising air temperature than the seasonal S SPI.
出处
《水资源保护》
CAS
2013年第6期64-69,共6页
Water Resources Protection
基金
国家自然科学基金(41171220)
国家科技支撑计划课题(2012BAB03B03)
水利部公益行业经费项目(200901045)
关键词
标准化降水指数
标准化降水蒸散发指数
帕默尔水文干旱指数
唐山地区
standardized precipitation index
standardized precipitation evapotranspiration index
Palmer hydrological drought index
Tangshan region
