基于重力卫星的四川省干旱事件特征研究

Research on Characteristics of Drought Eventsin Sichuan Province Based on Gravity Satellite

利用基于重力卫星时变重力场模型的严重干旱指数的干旱特征评估法研究了2002—2020年四川省发生的干旱事件并对干旱事件的持续时间、严重程度及峰值等干旱特征进行了量化分析.结果表明,在研究时间段内四川省共计发生了7次干旱事件,其中干旱严重程度较高的2次干旱事件分别发生在2002年7月至2003年5月和2009年5月至2010年4月.2次干旱事件分别持续了11个月和12个月,干旱严重程度分别为-72.64和-56.48.前者主要发生在四川省的东北部地区,而后者则主要发生在四川省西南部地区.基于重力卫星数据的干旱评估方法可以有效地探测到四川省干旱事件的发生,并能对干旱事件特征进行准确量化.

The drought characteristics evaluation method based on the severe drought index from gravity satellites time variable gravity field model was used to study the drought events in Sichuan from 2002 to 2020 and to analyze the duration,drought severity and peak value of these drought events.The results show that there were seven drought events in Sichuan during the study period and the two drought events with higher drought severity occurred from July 2002 to May 2003 and from May 2009 to April 2010,respectively.The two drought events lasted for 11 and 12 months,respectively,and the drought severity were-72.64 and-56.48,respectively.The former one mainly occurred in the northeast Sichuan and the latter one mainly occurred in southwest Sichuan.The above study results show that the drought assessment method based on gravity satellite data can effectively detect the occurrence of drought events in Sichuan province,and can accurately quantify the characteristics of drought events.