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SHORELINE CHANGES AND EVOLUTION OF THE COASTAL ZONE IN SOUTHERN KARNATAKA, 
INDIA - AN ANALYSIS BASED ON MULTI-TEMPORAL DATA 
H.Gangadhara Bhat*, K.R. Subrahmanya ** 
Department of Marine Geology 
Mangalore University 
Mangalagangotri- 574 199, 
India 
* samsan-vip@zetainfotech.com 
** subrahmanya @usa.net 
Working Group IC-23 
KEY WORDS: Coastal Zone, Erosion, Multi-spectral data, Multi-temporal, Remote Sensing. 
ABSTRACT 
A coastline of about 100 km in southern Karnataka, India has been investigated in the present study. The analysis of 
shoreline changes in the past 90 years has been carried out to understand the coastal dynamics and its influence on the 
natural and man-made features. The maps generated based on earliest available topographical maps have been compared 
with the maps generated based on the high spatial resolution (5.8 m) PAN data of IRS-1C of 1996 and 1998. The 
multidated data products study indicates the gradual shifting of the estuarine mouths of Nethravathi-Gurupur, Mulki-Pavanje 
and Udyavara to the north. A part of the changes in the morphology can traced to human interference by way of construc- 
tion of engineering structures. The breakwater of New Mangalore Port, the breakwaters at the mouths of Nethravathi- 
Gurupur estuary, Udyavara estuary and seawalls elsewhere have contributed substantially to the modification of shoreline. 
Anevaluation of depositional and erosional sites in the coastal zone indicates that the area covered by depositional features 
marginally exceed those under erosion. The enlargement and emergence of the land can be attributed to tectonic uplift. 
  
International Archives of Photogrammetry and Remote Sensing. Vol. XXXIII, Part B7. Amsterdam 2000. 191