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Ramakrishnan, Ratheesh
- Incessant Erosion of High Tidal Mudflats in the Northern Gulf of Khambhat
Abstract Views :193 |
PDF Views:89
Authors
Affiliations
1 Space Applications Centre, Jodhpur Tekra, Ahmedabad 380 015, IN
1 Space Applications Centre, Jodhpur Tekra, Ahmedabad 380 015, IN
Source
Current Science, Vol 114, No 12 (2018), Pagination: 2554-2558Abstract
Extensive erosion of high tidal mudflat along the northern parts of Gulf of Khambhat (GoK) was observed from the analysis of time series satellite images during the time period from March 2014 to September 2017. Around 28.66 sq. km area of high tidal mudflat eroded within this time period. Maximum erosion rates estimated have even peaked to about 4 km/year showing the severity of erosion. The mudflats under erosion are along the outer boundary of a meandering tidal channel connecting the Gulf with Mahi river. A possible cause of the incessant erosion of mudflats is the strong tidal currents along the outer boundary of the meandering tidal channel, that have carved the mudflats and pushed the tidal channel further landward. A subtle seasonal pattern of erosion was observed with decrease in erosion rates during the summer monsoon period when the high tidal currents are weak due to the river influx. Rapid erosion of the tidal mudflats has not only destroyed the vital habitat, but has also eventually exposed the inhabited land area to tidal flooding, making it vulnerable to erosion. The study shows the importance of assessing the stability of mudflats along the GoK, where large development activities are proposed.Keywords
DSAS, Erosion, High Tidal Mudflat, Satellite Data, Tidal Channel.Full Text
References
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- http://earthexplorer.usgs.gov
- Identification of Submarine Groundwater Discharge using Thermal Infrared Observations in the Arabian Ocean Near Okha Coast, Gujarat, India
Abstract Views :159 |
PDF Views:94
Authors
R. P. Singh
1,
Shard Chander
1,
Ratheesh Ramakrishnan
1,
Ashwin Gujrati
1,
Rohit Pradhan
1,
Chirag Wadhwa
1,
A. S. Rajawat
1,
Raj Kumar
1
Affiliations
1 Space Applications Centre, Indian Space Research Organisation, Ahmedabad 380 015, IN
1 Space Applications Centre, Indian Space Research Organisation, Ahmedabad 380 015, IN
Source
Current Science, Vol 119, No 9 (2020), Pagination: 1558-1564Abstract
In this study we identify a region of submarine groundwater discharge (SGD) near Okha coast, Gujarat, India using thermal infrared remote sensing technique. Observations of brightness temperature (BT) in the thermal infrared spectral region (10.6–11.19 μm) from Landsat-8 satellite in the coastal region showed unique localized cooling in the Arabian Sea during winter. We observed lowering of BT in the range 0.6°– 2.3°C in the coastal region associated with SGD in comparison to sea surface temperature of the ocean during low-tide conditions. Consistent geographical pattern of thermal contrast was observed near the same location (lat. 22°26′54.43″N, long. 69°00′41.67″E) when multi date (11 datasets) thermal data were analysed between 2015 and 2019 in winter. Generally, low-tide conditions show more cooling of ocean surface at the SGD site compared to high-tide conditions, which indicates the process of SGD. Satellite-based assessment was further validated using field- and ship-based measurements.Full Text