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引用本文:邬国锋,崔丽娟,纪伟涛.基于时间序列MODIS影像的鄱阳湖丰水期悬浮泥沙浓度反演及变化.湖泊科学,2009,21(2):288-297. DOI:10.18307/2009.0219
WU Guofeng,CUI Lijuan,JI Weitao.Time-series MODIS images-based retrieval and change analysis of suspended sediment concentration during flood period in Lake Poyang. J. Lake Sci.2009,21(2):288-297. DOI:10.18307/2009.0219
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基于时间序列MODIS影像的鄱阳湖丰水期悬浮泥沙浓度反演及变化
邬国锋1, 崔丽娟2, 纪伟涛3
1.武汉大学资源与环境科学学院, 教育部地理信息系统重点实验室, 武汉 430079;2.中国林业科学研究院林业研究所, 国家林业局林木培育重点实验室, 北京 100091;3.鄱阳湖国家级自然保护区管理局, 南昌 330038
摘要:
悬浮泥沙浓度是描述水质的重要参数之一,获得其在空间和时间上的分布信息对于理解、管理和保护湖泊生态系统是必要的.此研究旨在建立基于中分辨率成像光谱仪(MODIS)影像的鄱阳湖悬浮泥沙浓度反演模型,并利用建立的模型反演2000-2007年鄱阳湖丰水期的悬浮泥沙浓度,分析其在时间和空间上的变化特征并对引起这些变化的原因进行讨论.研究结果揭示:MODISTerra影像红波段与悬浮泥沙浓度具有显著的相关性(R2=0.92,s.e.=12.02mg/L,F=154.30,P<0.001),可以用于鄱阳湖丰水期悬浮泥沙浓度的反演;自2000-2007年间,鄱阳湖悬浮泥沙浓度呈明显的时间和空间分布特征,在南部水体悬浮泥沙浓度无明显变化,在北部呈增加趋势,而中部水体泥沙浓度波动较大;鄱阳湖北部的采砂活动是导致此区域悬浮泥沙浓度增加的主要原因,其与长江江水倒灌鄱阳湖共同作用引起鄱阳湖中部泥沙浓度的波动,抚河、信江和饶河输沙量的非显著变化也导致南部鄱阳湖水体悬浮泥沙浓度的非显著变化.
关键词:  鄱阳湖  MODIS  悬浮泥沙浓度  反演  变化分析
DOI:10.18307/2009.0219
分类号:
基金项目:国家林业局“948”项目;湿地自然保护区环境监测分析技术引进项目(2004-4-34)资助
Time-series MODIS images-based retrieval and change analysis of suspended sediment concentration during flood period in Lake Poyang
WU Guofeng1, CUI Lijuan2, JI Weitao3
1.School of Resource and Environmental Science & Key Laboratory of Geographic Information System of Ministry of Education, Wuhan University, Wuhan 430079, P. R. China;2.Research Institute of Forestry, Chinese Academy of Forestry & Laboratory of Tree Breeding and Cultivation, State Forestry Administration, Beijing 100091, P. R. China;3.Bureau of Jiangxi Lake Poyang National Nature Reserve, Nanchang 330008, P. R. China
Abstract:
Suspended sediment concentration (SSC) is one of important indicators for describing water quality, and obtaining its spatial and temporal distribution information is necessary for understanding, managing and protecting lake ecosystems. This study aimed to developed the Moderate-resolution Imaging Spectroradiometer (MODIS) image-based SSC retrieval model for Lake Poyang, used the model to predict the SSC of Lake Poyang during the flood period from 2000 to 2007, analyzed its spatial and temporal change characteristics and further discussed the causes to induce these changes. The results revealed that: the red band of MODIS Terra was significantly related to the SSC (R2= 0.92, s.e.=12.02mg/L, F=154.30, P<0.001), and it may be applied to retrieve the SSC of Lake Poyang during the flood period. The SSC of Lake Poyang showed clear spatial and temporal distribution characteristics from 2000 to 2007, while the SSC had no clear change in the south, increased in the north and fluctuated largely in the centre of the lake. The dredging activities in the northern Lake Poyang was the main cause inducing the increased SSC in this region, and mixed with water backflow from the Yangtze River to Lake Poyang which resulted in the fluctuation of SSC in the centre. Non-significant changeof sediments from Rivers Fuhe, Xinjiang and Raohe caused the non-significant change of SSC in the south lake
Key words:  Lake Poyang  MODIS  suspended sediment concentration  retrieval  change analysis
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