摘要
以1975年、1980年和1985年的Landsat MSS影像、1990年、1995年、2000年和2010年的Landsat TM影像、2005年的Landsat ETM＋影像、2014年的Landsat OLI影像为数据源,根据水体的光谱特征,利用波段比值法（绿波段/短波红外波段）,进行水体信息提取,得到了9个时期的巴尔喀什湖水体面积及其变化趋势,并综合分析了其主要影响因素。研究结果表明,1975-2014年巴尔喀什湖面积呈波动减少,并与水位变化趋势基本一致;1975-1990年期间,巴尔喀什湖水体面积急剧减少,变化速率为-48.4 km^2/a,与水位降低了0.9 m;1990-2005年期间,巴尔喀什湖水体面积波动变化,但增加幅度很小,仅增加了0.36%;2005-2014年期间,巴尔喀什湖水体面积以每年10.1 km^2的速度缓慢减少,水位也发生小幅度下降。巴尔喀什湖水体面积不受同期年平均气温和年降水量的影响,其主要受水库调节入湖水量的影响。
The remotely sensed images of Landsat MSS in 1975, 1980 and 1985, Landsat TM in 1990, 1995,2000 and 2010, Landsat ETM＋ in 2005, and Landsat OLI in 2014 were used to extract information of water area of Lake Balkhash. The method used was reflectivity ratio of green and short-wave（length） infrared bands,which was based on the spectral characteristics of water. The water areas during 9 periods were obtained and driving factors of water area change were analyzed. The results showed that the water area decreased fluctuatedly during 1975-2014. And the change was consistent with water level. Lake Balkhash experienced a dramatic shrinkage during 1975-1990 with a rate of per year 48.4 km^2. Meanwhile, the water level dropped down 0.9m. The water area fluctuation was large during 1990-2005 and water area of Lake Balkhash increased 0.36%in total. During 2005-2014, the area decreased gently with an average rate of per year 10.1 km^2. And water level declined a little at the same time. However, the influence factor of water area change mainly was human activities by regulating the runoff into the lake.
出处
《湿地科学》
CSCD
北大核心
2016年第3期368-375,共8页
Wetland Science
基金
国家自然科学基金项目(41471290)资助
关键词
水体面积
变化
遥感影像
反射率波段比值
巴尔喀什湖
中亚
water area
change
remote sensing images
reflectivity ratio of bands
Lake Balkhash
Central Asia
