| 半干旱区旱情监测指数应用分析 |
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| 引用本文： | 王文种,张友静.半干旱区旱情监测指数应用分析[J].地球信息科学,2008,10(2):273-278. |
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| 作者姓名： | 王文种 张友静 |
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| 作者单位： | 1. 河海大学水文水资源学院, 南京 210098;
2. 河海大学水文水资源及水利工程国家重点实验室, 南京 210098 |
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| 摘 要： | 本文利用MODIS地表温度数据(Ts)和增强型植被指数EVI构建Ts和EVI(Enhanced Vegetation Index)空间。同时分别获取2002年3月8日,4月2日、4月13日、6月12日的温度植被干旱指数TVDI,以其为旱情指标对黄河三花间(三门峡-花园口区间)区域旱情进行了监测;结合气象站点数据及表观热惯量对TVDI进行评价,TVDI与热惯量相关系数R2达到0.7,并分析了土地利用和高程对TVDI的影响。结果表明:土地利用影响着TVDI值的分布;三花间(三门峡-花园口区间)区域250m以上高程和TVDI关系显著。以Ts和EVI构建的TVDI适用于半干旱区的旱情监测。
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| 关 键 词： | 半干旱区 MODIS Ts EVI 土地利用 TVDI |
| 收稿时间： | 2008-01-26; |
| 修稿时间： | 2008年1月26日 |
Drought Monitoring Index and its Application in Semiarid Area |
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| WANG Wenzhong,ZHANG Youjing.Drought Monitoring Index and its Application in Semiarid Area[J].Geo-information Science,2008,10(2):273-278. |
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| Authors: | WANG Wenzhong ZHANG Youjing |
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| Institution: | 1. State Key Laboratory of Hydrology-Water Resources and Hydraulic Engineering, Hohai University, China;
2. Colleges of Hydrology and Water Resources, Hohai University, Nanjing 210098, China |
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| Abstract: | In this paper,Enhanced Vegetation Index(EVI) and MODIS Land Surface Temperature(Ts) product data MOD11_L2 were used to construct the Ts-EVI space,from which the Temperature Vegetation Drought Index(TVDI) was obtained as drought index to monitor drought in Sanhuajian area of the Yellow River on Mar.8th,Apr 2 nd.,Apr.13th and Jun.12th in 2002.Data from weather station and apparent thermal inertia(ATI) were also obtained to evaluate TVDI.A relationship(R2=0.734 5) was also obtained between TVDI and ATI.Land-use type and elevation were also studied.The results indicated that both of them were important influencing factors,different land use types had different distributions of TVDI,and the relationship between the height above 250m and TVDI was obvious.It was feasible to monitor the drought dynamic variations in semiarid area with complex terrain by using TVDI. |
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| Keywords: | semiarid area MODIS enhanced vegetation index land surface temperature land use temperature vegetation dryness index |
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