| 引用本文: | 李晖,肖鹏峰,冯学智,万玮,马荣华,段洪涛.近30年三江源地区湖泊变化图谱与面积变化.湖泊科学,2010,22(6):862-873. DOI:10.18307/2010.0608 |
| LI Hui,XIAO Pengfeng,FENG Xuezhi,WAN Wei,MA Ronghua,DUAN Hongtao.Lake changes in spatial evolution and area in source region of Three Rivers in recent 30 years. J. Lake Sci.2010,22(6):862-873. DOI:10.18307/2010.0608 |
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| 摘要: |
| 以近30年的40景Landsat MSS/TM/ETM+、CBERS CCD遥感影像为数据源,采用植被指数法结合人工目视解译,分为四个时期对三江源地区湖泊进行了遥感水体检测.选取面积在15km2以上、总面积占研究区湖泊总面积的90%左右的24个湖泊作为典型湖泊,建立该地区湖泊的变化图谱,并引入湖泊萎缩强度指数对湖泊的面积变化及空间分布特征进行分析.结果表明,以第三时期(1999-2002年)为界,这24个湖泊总体上经历了先萎缩后扩张的过程,且萎缩的程度大于扩张的程度,近30年来湖泊总面积缩小了65.76km2.本文研究结论可为三江源地区对气候变化响应研究提供参考,并对区域水资源合理利用提供科学依据. |
| 关键词: 三江源地区 湖泊变化图谱 面积变化 遥感 湖泊萎缩强度指数 |
| DOI：10.18307/2010.0608 |
| 分类号: |
| 基金项目:科技部基础性工作专项"中国湖泊水质、水量和生物资源调查"项目(2006FY110600)资助 |
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| Lake changes in spatial evolution and area in source region of Three Rivers in recent 30 years |
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LI Hui1, XIAO Pengfeng1, FENG Xuezhi1, WAN Wei1, MA Ronghua2, DUAN Hongtao2
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1.Department of Geographic Information Science, Nanjing University, Nanjing 210093, P. R. China;2.Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences, Nanjing 210008, P. R. China
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| Abstract: |
| This paper presents the changes of lakes in the source region of Three Rivers (the Yangtze, Yellow and Nujiang Rivers) in recent 30 years by using the methods of GIS and remote sensing. Time slices of 40 images of Landsat MSS/TM/ETM+ and CBERS CCD are divided into four stages of the last 30 years. Each area of the 24 lakes is more than 15km2 and the overall area is more or less 90% of the entire lake area in the Three Rivera. Firstly, the vegetation index method is used to detect the lakes from the images, and manual interpretation is consistent to modify the detection. Then the spatial evolutions of 24 lake variations are built up based on the water body boundaries. Finally, the index of the lake loss intensity is introduced to analyze changes of lake area and the distribution. The result presents that the total area of all 24 lakes declined from the first stage to the third stage (1999~2002), and then increased slightly during the fourth stage. However, the amount of reduced area is more than increases and the total area has lost 65.76 km2 during recent 30 years. The present study provides benefit to understand the regional response to climatic change and utilize the water resources reasonably in the Source Region of Three Rivera. |
| Key words: Source region of Three Rivers lake spatial evolution area change remote sensing index of the lake loss intensity |
