The morphological changes of river mouth along the coastal tract of nagapattinam district using satellite image

The major objective of the present study is to demonstrate how remote sensing approach can be used for studying river mouth changes of Nagapattinam district. The sand particles have been removed at higher percentages with a little change, due to such unfavorable hazard like floods, storms and tsunami. The river carries suspended sediments. The length of Nagapattinam coast line is about 187km. The satellite imagery of the years 1991, 1999, and 2008was used for identifying the River mouth changes in the study area. ERDAS and ARC GIS software has been used for the said purpose. The river mouth is digitized along the shoreline. The major changes were noticed and brought for the changes in the study of Uppanar river, Vettarriver, Vellar river. An analytical solution is derived for predicting time-variation of river mouth width under the combined influence of incoming waves and effluent river discharge.