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Discussion papers | Copyright
© Author(s) 2018. This work is distributed under
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Research article 21 Jun 2018

Research article | 21 Jun 2018

Review status
This discussion paper is a preprint. It is a manuscript under review for the journal Ocean Science (OS).

Monitoring of seasonally variability and movement of suspended sediment concentration along Thiruvananthapuram coast using OLI sensor

Bismay Ranjan Tripathy1, Kaliraj Seenipandi1, Haroon Sajjad2, Pawan Kumar Joshi3, Bhagwan Singh Chaudhary4, and Pavan Kumar2 Bismay Ranjan Tripathy et al.
  • 1National Centre for Earth Science Studies, Thiruvananthapuram – 695011, India
  • 2Department of Geography Jamia Millia Islamia, New Delhi, India
  • 3School of Environmental Science, Jawaharlal Nehru University, New Delhi, India
  • 4Department of Geophysics, Kurukshetra University, Kurukshetra, Haryana, India

Abstract. In the recent decades hydrologists, geologists, and stream ecologists have shown substantial interest in analyzing suspended sediments in water. Extracting information like suspended sediment concentration (SSC) in coastal waters is very important for assessment and monitoring of coastal settings and their effects on their ecology. This article demonstrates importance of Landsat 8 Operational Land Imager (OLI) for monitoring seasonal variation in SSC and movement (pre and post monsoon) along Thiruvananthapuram Coast in India. The data was converted into marine reflectance after correcting due atmospheric errors. SSC was extracted using spectral analysis data analysis. Movement of SSC was monitored using wave direction and significant wave height data. The results revealed that the SSC decreased rapidly with the increase in distance from the beach and depth of the seabed. Wave with higher frequency in deeper water caused sparely circulation of sediments and their concentration at the lower depth in high bathymetry. Thus, the suspended sediments were indirectly proportional to bathymetry and distance from the shoreline and directly proportion to wave direction and littoral current at off-shore. High concentration of sediments was found to be accumulated at shallow depth (<10m), which was estimated to be 92mg/l and decreased up to 30mg/l at a depth of 30m. The movement of sediments was observed north-south during the pre-monsoon and reversed during post-monsoon due to reversal in wind direction. Satellite remote sensing techniques and data processing can be efficiently used for SSC monitoring and their movement in ocean. Such estimates over temporal and spatial scales can be used for coastal zone management and conservation.

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Bismay Ranjan Tripathy et al.
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Short summary
The paper explored applicability of Landsat OLI sensor for monitoring concentration and movement of suspended particles along coastal landscape of Thiruvananthapuram. Suspended sediments moved north-south during post monsoon and reversed their direction during post monsoon season under the influence of monsoon winds. The findings revealed that the sediment concentration decreased rapidly with the increase in distance to the beach and depth to the seabed.
The paper explored applicability of Landsat OLI sensor for monitoring concentration and movement...