地理学报

地理学报 ›› 2004, Vol. 59 ›› Issue (1): 88-94.doi: 10.11821/xb200401011

• 卫星遥感监测 • 上一篇    下一篇

应用Terra/MODIS卫星数据估算洞庭湖蓄水量的变化

龟山哲,张继群,王勤学,徐开钦,加藤贵雄,渡边正孝   

  1. 日本国立环境研究所，筑波 305-8506
  • 收稿日期:2003-09-07 修回日期:2003-11-29 出版日期:2004-01-25 发布日期:2004-01-25
  • 作者简介:龟山哲(1968- )，男，博士，主任研究员。主要从事遥感技术开发与应用方面的研究。E-mail: kame@nies.go.jp
  • 基金资助:

    亚洲太平洋地区环境创新战略项目(APEIS) 环境综合监侧子课题(IEM)

An Approach to Estimate the Water Level and Volume of Dongting Lake Using Terra/MODIS Data

KAMEYAMA Satoshi, ZHANG Jiqun, WANG Qinxue, XU Kaiqin, KATOH Takao, WATANABE Masataka   

  1. National Institute for Environmental Studies, Tsukuba 305-0053, Japan
  • Received:2003-09-07 Revised:2003-11-29 Online:2004-01-25 Published:2004-01-25
  • Supported by:

    Integrated Environmental Monitoring (IEM) Subproject, the Asia-Pacific Environmental Innovation Strategy Project (APEIS)

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被引次数

85

摘要：

以洞庭湖为例，利用2002年的美国Terra/MODIS卫星数据，以16天为周期将全年划分为23个时段,分别对湖区水位和蓄水量分布特征和变化规律进行动态监测和综合分析。具体测算方法包括以下4个步骤: (1) 根据湖区特性，将整个洞庭湖分为3个部分：自西向东依此是西洞庭湖 (WDL), 南洞庭湖 (SDL) 和东洞庭湖 (EDL)。这3个部分的蓄水量之和就是整个洞庭湖的总蓄水量。(2) 以水体和陆地的光谱差异为基础，使用Terra/MODIS卫星的NDVI 数据识别并量测湖区水面积。(3) 将湖区水面影像同湖区数字高程模型DEM相叠加,以被监测的湖区水面的平均高度值作为水面高度。水面高度与湖底高度的差即为相应点的水深。(4) 按50 m×50 m网格大小和相应位置的水深的乘积来计算每个水柱体积。最后，将整个湖内的所有水柱的体积值累加便得到洞庭湖的总蓄水量。用上述方法测算的水位和蓄水量与实测资料进行了比较表明，两者具有很好的一致性。

关键词: 洞庭湖；蓄水量；空间分布；地理信息系统

Abstract:

By using Terra/MODIS satellite data in 2002, the dynamic variation of surface water area and water storage in Dongting Lake was studied. We, at first, divided the whole Dongting Lake into three parts (WDL: West Dongting Lake, SDL: South Dongting Lake, EDL: East Dongting Lake from west side) according to geographical characteristics. Secondly, surface water area was detected based on the spectral deference between water and terrestrial area using satellite (Terra/MODIS) NDVI (Normalized Difference Vegetation Index) data. Thirdly, the surface water area was overlaid on the lake bottom DEM with a grid size of 50 m by 50 m, and the water level could be calculated. Finally, the water storage was obtained by times water depth (difference between water surface elevation and lake-bottom elevation.) with the grid area. The total water storage at Dongting Lake was calculated by accumulating all water column values in the whole lake. By comparing the estimated water level and storage with the measurements in the three parts of the Dongting Lake, we found that there are high correspondences between the two, which implies that our method is an effective approach to estimate water level and water storage of a large lake.

Key words: Dongting Lake, water storage, spatial distribution, GIS