摘要
针对广东省气候湿润、植被覆盖度高的特点,以NOAA/AVHRR资料为数据源,采用植被供水指数法,对2004年广东省发生的50年来最严重的一次干旱灾害进行遥感动态监测,并结合土地利用分类数据,采用掩膜技术提取干旱分类信息。研究结果表明,10月上旬全省部分地区出现旱情,10月下旬全省受旱总面积达到峰值,占全省面积的72.6%;11月上旬后期受旱面积有所减少,中旱、重旱区域有所增加,其后旱情总体呈减缓趋势,但在12月中旬出现了短暂的增加趋势。以11月上旬为例的干旱灾害分类研究还表明,水田、旱地、灌木、林地等不同的用地类型,其受旱比例依次递减。该研究结果较好地反映了本次干旱灾害的空间分布及发展过程,为相关部门进行干旱灾情评估、制定和实施抗旱减灾措施提供了科学依据。
In view of the humid climate and good vegetation in Guangdong Province, this paper uses NOAA/ AVHRR data and vegetation water supply index to monitor the drought in 2004, which is the most serious one over the past 50 years. Combining with land usage classification data, it uses mask technique to classify the drought. The outcome shows the trend of the drought in Guangdong Province in 2004. The drought appeared in some areas in the first ten days of October, and peaked in the middle ten days of the month so that 72.6 percent of the whole province was under drought. The drought areas declined in the first ten days of November, but moderate and serious drought areas increased. Then the drought lessened as a whole before increasing slightly in mid-December. Taking the drought in the first ten days of November as an example, the drought classification research shows that the drought degree varied with different land- use types. Decreasingly, paddy field, dry land, bush and woodland are affected by drought. The result of this paper provides a scientific base for departments concerned to estimate drought status and take measures to reduce the drought disasters.
出处
《热带气象学报》
CSCD
北大核心
2006年第3期237-240,共4页
Journal of Tropical Meteorology
基金
广东省农业攻关项目(2005B10101022)
关键词
干旱
遥感监测
植被供水指数
灾情评估
drought
remote sensing monitoring
vegetation water supply index
disaster estimate
