基于温度植被干旱指数法的河北省中南部地区的干旱监测

摘要

The TVDI drought remote sensing monitoring model based on Ts-EVI was established by using MOD11A2 of surface temperature product and MOD13A2 of vegetation index product from the MODIS data in the corresponding period of many years,maximum and minimum synthesis method,compound general characteristic space dry and wet edge equations and the drought spatial distribution in Central-south region of Hebei Province from March to June,2015 was inverted by the established drought remote sensing monitoring model to monitor drought situation in Central-south region of Hebei Province by a large scale and real-time dynamic pattern.The TVDI model is tested by the relative humidity of soils with 10 cm,20 cm and 50 cm depth from different soil moisture stations.Results:The correlation coefficient between TVDI model and the relative humidity of soils with 10 cm,20 cm and 50 cm depth is 0.233,0.325 and 0.130 respectively.The correlation between TVDI model and soil depth is soil depth with 20 cm ＞ 10 cm ＞ 50 cm,which indicates that the TVDI mode is more sensitive to relative humidity of surface soil.%为大范围、实时动态监测河北省中南部地区的干旱状况,利用多年同期MODIS数据地表温度产品MOD11A2和植被指数产品MOD13A2,采用最大值、最小值合成法,合成通用特征空间干、湿边方程,构建基于Ts-EVI的TVDI干旱遥感监测模型,反演2015年3-6月河北省中南部地区干旱的空间分布.利用土壤墒情站10 cm、20 cm和50 cm不同深度的土壤相对湿度验证TVDI模型.结果表明:TVDI与10 cm、20 cm和50 cm不同深度土壤相对湿度的相关系数(R2)分别为0.233、0.325和0.130,TVDI模型与20 cm相关性最高,10 cm次之,50 cm最低.表明,TVDI模型对表层土壤相对湿度更为敏感.