【摘要】 根据MODIS数据,基于植被供水指数法(VSWI),通过对2006年6月10—9月21日期间的12个时相的全市干旱空间分布状况分析,得到了2006年重庆特大干旱期间从旱情发生—旱情加重—局部缓解—旱情再次加重—旱情彻底缓解的整个演变过程。为了验证VSWI方法对2006年重庆特大干旱监测的准确性,结合全市同时期170个土壤墒情监测站的土壤湿度资料,对此次监测过程进行了验证。结果表明:基于MOIDS数据的植被供水指数法可以对重庆市夏季干旱进行实时监测和有效反馈,VSWI与土壤湿度有较好的负相关关系,同时VSWI指数与土壤墒情数据的相关性与高程有一定的相关关系。更多还原

【Abstract】 According to the MODIS data from June 10 to September 21 in 2006,12 phases of drought spatial distribution in Chongqing have been gotten based on vegetation supply water index (VSWI),which showed the whole evolution process of severe drought in 2006 summer in Chongqing from drought occurred-increased-relieved-increased again-complete remission.To verify the monitoring accuracy of VSWI in Chongqing severe drought in 2006,the soil moisture data in 170 soil moisture monitoring stations in the same period was used.The results were showed as three aspects.(1) Vegetation supply water index (VSWI) based on MOIDS data can monitor in real-time and feedback effectively summer drought in Chongqing.(2) VSWI and soil moisture had a good negative correlation.(3) The correlation index between VSWI and soil moisture also had certain relationships with elevation.更多还原