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基于MODIS遥感影像数据的洞庭湖蓄水量估算
引用本文:蔡青,黄璐,梁婕,李晓东,龙勇,肖义,刘卡波,谢更新,曾光明. 基于MODIS遥感影像数据的洞庭湖蓄水量估算[J]. 湖南大学学报(自然科学版), 2012, 39(4): 64-69
作者姓名:蔡青  黄璐  梁婕  李晓东  龙勇  肖义  刘卡波  谢更新  曾光明
作者单位:1. 湖南大学 环境科学与工程学院,湖南 长沙410082;环境生物与控制教育部重点实验室(湖南大学),湖南长沙410082
2. 湖南省水利厅,湖南 长沙,410007
3. 湖南省洞庭湖水利工程管理局,湖南 长沙,410007
基金项目:国务院三峡委员会项目,国家自然科学基金资助项目,新世纪优秀人才支持计划资助项目
摘    要:以洞庭湖为研究对象,应用MODIS遥感影像、水位以及湖底DEM数据估算洞庭湖蓄水量.根据水体在近红外和红外波段的吸收特性,通过对MODIS数据NDVI指数和NIR波段分别设置阈值的方法来实现对洞庭湖水面的动态提取.根据洞庭湖流域各水文/水位站的水位数据,进行空间插值,得到洞庭湖多个时段的水位空间分布.结合洞庭湖水面提取数据、水位插值数据和湖底DEM,估算洞庭湖蓄水量,并以此初步分析三峡截流前后洞庭湖流域的水文响应.结果显示,该方法能有效实现对洞庭湖蓄水量的估算,计算得出的水面面积、蓄水量有明显的相关性;洞庭湖蓄水量与城陵矶水位呈现明显的3次曲线关系,截流前后3年拟合方程决定系数分别达到了0.915和0.928;截流后三峡工程调蓄功能初显,连续3年洞庭湖汛期累积水量占全年水量比重减小;与此同时夏末秋初三峡水库蓄水,下泄水量减少加剧了2006年洞庭湖流域夏秋连旱的影响.

关 键 词:遥感  水面面积  蓄水量  洞庭湖  三峡工程

Estimation of the Water Volume of the Dongting Lake with TERRA/MODIS Data
CAI Qing,HUANG Lu,LIANG Jie,LI Xiao-dong,LONG Yong,XIAO Yi,LIU Ka-bo,XIE Geng-xin,ZENG Guang-ming. Estimation of the Water Volume of the Dongting Lake with TERRA/MODIS Data[J]. Journal of Hunan University(Naturnal Science), 2012, 39(4): 64-69
Authors:CAI Qing  HUANG Lu  LIANG Jie  LI Xiao-dong  LONG Yong  XIAO Yi  LIU Ka-bo  XIE Geng-xin  ZENG Guang-ming
Affiliation:1,2(1.College of Environmental Science and Engineering,Hunan Univ,Changsha,Hunan 410082,China;2.Key Laboratory of Environmental Biology and Pollution Control(Hunan Univ),Ministry of Education,Changsha,Hunan 410082,China; 3.Dept of Water Resources of Hunan Province,Changsha,Hunan 410007,China; 4.Dongting Lake Hydraulic Engineering Administration Bureau,Changsha,Hunan 410007,China)
Abstract:This paper studied the water volume of the Dongting Lake by using Terra/MODIS satellite data,water level and lake bottom DEM(Digital Elevation Model).As water has a high absorption rate in the near infrared and infrared band,the water area of the Dongting Lake was extracted by setting thresholds on NDVI(Normalized Difference Vegetation Index) and NIR(Near InfraRed).A water level distribution map was obtained by interpolating the water level data from hydrological stations.The volume of the Dongting Lake was estimated by using the water area map,the water level distribution map and the lake bottom DEM.The hydrological response of the Dongting Lake on the Three Gorges was studied by using the water level,area,and volume data.The result has shown that the method mentioned above can be used for water volume estimation of the Dongting Lake.The water area,water volume and water level have a high correlation.The water level of Chenglingji and water volume of the Dongting Lake was fitted by cubic curve,and the coefficients of the determination of the fitting curves were 0.915 and 0.928,respectively.The Three Gorges Project has shown the ability of flood storage after interception,and the cumulative water volume ratio of flood season decreased year by year from 2004 to 2006.At the same time,during late summer and early autumn,the impoundment of the Three Gorges Project causes the decrease of water discharged,which increases the drought of the Dongting Lake.
Keywords:satellite  water area  water volume  the Dongting Lake  Three Gorges
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