Hailin, Z., Baoyin, H. Evaluating lake eutrophication with enhanced thematic mapper data in Wuhan., Chin. J. Ocean. Limnol. 24, 285–290 (2006). https://doi.org/10.1007/BF02842629
DOI:
Hailin, Z., Baoyin, H. Evaluating lake eutrophication with enhanced thematic mapper data in Wuhan., Chin. J. Ocean. Limnol. 24, 285–290 (2006). https://doi.org/10.1007/BF02842629DOI:
Evaluating lake eutrophication with enhanced thematic mapper data in Wuhan
摘要
Abstract
By analyzing the enhanced thematic mapper (ETM) images of September 1999
and quality observation data for many consecutive years in several parts of the Donghu Lake in Wuhan
China
the authors discovered a good linear relation between grey scale (GS) abstracted from ETM b5
b7 images and eutrophication level of the lakes
and extended the study to eight other major lakes in the area of Wuhan by using lake eutrophication models. Based on thein situ monitoring data
we also evaluated the eutrophication level of the lakes with modified trophic index method brought by M. Aizaki et al. The results of the two methods showed that the most of the lakes were eutrophicated
and even hyper-eutrophicated in some areas. Six of the 8 lakes had very similar trophic state index (TSI) values. Although two of them differed in TSI value
but within an order
while it was different largely from the one by traditional method. The difference of the results between the two methods might have been due to three causative reasons. First
remote sensing technology reflects the overall status of a certain area corresponding to the ETM images in a certain period
but the modified TSI reflects the annual average values of the monitoring spots. Second
the time the ETM images taken is later than that ofin situ data. Third
ETM images are affected by clouds
water depth
and suspended matter. In short
remote sensing result agreed greatly with thein situ monitoring data
indicating that remote sensing technology is feasible and effective for monitoring and evaluating the lake eutrophication in the Wuhan area and it also can be used to evaluate large-scope lake eutrophication.
关键词
Keywords
references
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