Study of morphology and suspended sediment of Bhopal Upper Lake using spatial simulation technique and remote sensing data |
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| Authors: | K H V Durga Rao Ambesh Kumar Singh P S Roy |
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| Institution: | (1) Faculty of Civil Engineering and Architecture, Split University, Matice hrvatske Str. 15, Split, 21000, Croatia;(2) Meteorological and Hydrological Service, Grič 3, Zagreb, 10000, Croatia |
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| Abstract: | The scope of this research was to study lake morphology using spatial simulation technique, to develop revised elevation-capacity
curve, to develop elevation-water spread area curve, to study the relation between suspended sediment and remote sensing satellite
data, and to estimate suspended sediment load in the lake using a Geographic Information System coupled with ground truth.
The study area was the Bhopal Upper Lake, which has been classified as one of the major wetlands in India by the Ministry
of Water Resources, India. A precise digital elevation model was created using 0.5 meter interval contour information collected
from bathometric surveys. Water-spread areas at different water levels were simulated spatially in a Geographic Information
System (GIS) through the neighbourhood connectivity operator. Revised elevation-capacity curve and elevation-area curve of
the lake were prepared using the simulated results. Simulated water spread area at full tank level (FTL) was compared with
the actual water spread area delineated using remote sensing data. Water samples at different locations of the lake were collected
and located using the Global Positioning System (GPS) instrument. These samples were analysed in the laboratory for suspended
sediment concentration. Different image processing techniques were applied to LANDSAT 5 TM satellite digital data (except
thermal band). Correlation between radiance values of band 2 and suspended sediments was established and a positive linear
equation was found to fit the data best. Spatial distribution of suspended sediment load was estimated using the developed
regression equation and band 2 radiance image of the complete lake. Total suspended sediment load and loss of capacity at
full tank level were computed. |
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