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The changing characteristics of drought in China from 1982 to 2005

机译:1982年至2005年中国干旱的变化特征

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摘要

Drought is one of the most detrimental natural disasters. Studying the changing characteristics of drought is obviously of great importance to achieve the sustainable use of water resources at river basin scales. In this paper, the satellite-based Vegetation Condition Index (VCI) and Vegetation Health Index (VH) were firstly calculated by using NDVI and brightness of the Global Vegetation Index dataset derived from Advance Very High Resolution Radiometer for China in growing seasons over 1982-2005. Then, the long-term VCI and VH data were employed to study the variation of droughts in the ten basins covering the whole country. The linear trend of each pixel showed that most parts of China were getting wetter in growing seasons, and the drought areas defined by the number of drought pixels have decreased in most basins. The increasing trend of basin averaged values of VCI and VH also indicates the whole country was generally getting wetter. At last, to better understand the two remote sensing drought indices, the response of the growing-season VCI and VH was compared to that of the Palmer Drought Severity Index and 6-month Standard Precipitation Index. Significant spatial variability of the relationship between the VCI, VH, and the station-based meteorological drought indices was shown, and some more closely related areas were found. The study will be useful for water resources management for each basin in the future.
机译:干旱是最有害的自然灾害之一。研究干旱的变化特征对于实现流域尺度水资源的可持续利用具有重要意义。本文首先利用NDVI和1982年以来生长季节中中国超高分辨率高分辨率辐射计得出的全球植被指数数据集的亮度,首先使用NDVI计算了卫星植被状况指数(VCI)和植被健康指数(VH)。 2005年。然后,利用长期VCI和VH数据研究了覆盖全国10个盆地的干旱变化。每个像素的线性趋势表明,中国大部分地区在生长期都变得湿润,而在大多数盆地中,由干旱像素数量定义的干旱地区有所减少。 VCI和VH流域平均值的增加趋势也表明,整个国家普遍变湿。最后,为了更好地理解这两个遥感干旱指数,将生长季节的VCI和VH的响应与Palmer干旱严重性指数和6个月标准降水指数的响应进行了比较。显示了VCI,VH和基于气象站的气象干旱指数之间关系的显着空间变异性,并且发现了一些更密切相关的区域。该研究对于将来每个流域的水资源管理将是有用的。

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