APPLICATION OF REMOTE SENSING TO STUDY THE DYNAMIC CHANGES OF NETRAVATHI

INTERNATIONAL SYMPOSIUM ON INFORMATION TECHNOLOGY IN OCEANOGRAPHY (ITO-98)

GOA, INDIA 12-16 OCTOBER 1998

APPLICATION OF REMOTE SENSING TO STUDY THE DYNAMIC CHANGES OF NETRAVATHI - GURPUR RIVER MOUTH , D.K. COAST, KARNATAKA

G.S.Dwarakish J.Dattatri N.B.S.Rao Subba Rao
Lecturer Professor Prof & Head Sr.Lecturer
Department of Applied Mechanics & Hydarulics
K.R.E.C., Surathkal, Srinivasnagar P.O. - 574 157,
Karnataka, India

The satellite remote sensing, with its synoptic view a,-,id capabilities to give spatially continuous data on a repetitive basis has increased the possibilities of studying Ocean and Ocean-Coast interaction, inventory and monitoring resulting coastal features. Macro level data from the satellite remote sensing has to be combined with microlevel data from field investigation to get the complete information about the coastal features. The present study combines these two approaches to investigate the dynamic changes occurring in the Netravathi-Gurpur river mouth in Dakshina Kannada District, West Coast of India.

Macrolevel study has been conducted by using IRS-IA LISS-11 (1988), IRS-IB LISS-11 (1 994) data along with Survey Of India toposheet (1 912). Field studies were conducted to provide the ground truth data regarding river mouth changes and the sediment samples were collected and analysed at selected stations for a period 3 years for microlevel study.

The macrolevel and microlevel study reveals that

The deposition adjacent to the breakwaters at Netravathi-Gurpur river mouth is not due to the interception of littoral drift but is the result of movement of river sediment into the coastal zones.
Higher wave energy fluctuations on the Ullal side compared to Bengre side indicated by large variations of statistical parameters on Ullal side compared to Bengre side.
The sediment near the breakwaters have many sub-populations and saltation modes appears to dominate over other transport modes.
Netravathi-Gurpur river mouth has been stabilised after the construction of breakwaters.
Sediment trend matrix is one of the very good tools to study the pattern of sediment deposition.

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