Spatio-temporal assessment of floating vegetation in vembanad lake using multispectral remote sensing
Material type:
TextDescription: MPhil EI 2017-2018Subject(s): Dissertation note: MPhil EI 2017-2018 INT
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Project Reports
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Kerala University of Digital Sciences, Innovation and Technology Knowledge Centre | Non Fiction | Not for loan | R-1418 |
A study on the spatio-temporal variations of floating vegetation in Vembanad
Lake during the period 2000-2016 has been done using multispectral remote
sensing. The study has used medium resolution Landsat-5 TM, Landsat-7
ETM, ASTER and Landsat-8 OLI-TIRS imageries of the study area. Using
satellite remote sensing for the analysis present us with the advantage that
it is possible to readily identify and analyse the changes occurring to the
study area. Floating vegetation and cyanobacterial blooms pose threats to
the ecosystem as well as to human activities, so it is important to map and
monitor the growth and spread patterns. Also the cyanobacterial blooms are
an indicator of water quality of the lake. By studying about the cyanobacterial
blooms we get information regarding the health of the ecosystem as
well.The study also analysed the spatial changes occurred to the lake, mainly
the land reclamations happened during the period of study.
Change detection analysis was conducted between the images of 2000 and
2016 and it could be seen that there is a shrinkage of 2.678 sq.km. during
the period of the study. Major land reclamations are at or around
Kochi, mainly for development purposes. Different indices were calculated
and NDWI showed more promise in extracting out the desired features from
other land cover classes. On unsupervised classification of the NDWI profiles,
a decreasing trend in the NDWI value was identified south to the Thanneermukkom
barrage whereas in the northern regions of the lake, the NDWI
values was more or less stable. The floating vegetation (macrophytes) map
were prepared from the NDWI images and the spatial as well as temporal
variation in their distribution were studied. The area of the floating vegetation
varies between around 5.95 sq.km and 1.8 sq.km during the period
of study, and the area is on a decreasing trend from 2008 onwards. The
macrophytes are more concentrated on the southern arm of the lake than the
northern stretch.
MPhil EI 2017-2018 INT Dr. R. Jaishanker
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