ABSTRACT
Vellar river basin is located in the northern part of Tamil Nadu state in South India, between the latitudes 11° 13′ N – 12° 00′ N and longitudes 78° 13′ E – 790 47′ E. The total area of the basin is 7520.87 Km2. The total length of the river is 150 km. The river originates on the southern slope of Kalvarayan hills in Salem District and drains into Bay of Bengal near Parangipettai (Port-O-Nova) in Chidambaram taluk of Cuddalore District. The river is a seasonal one and receives most of the flow during north east monsoon. In the lower reaches the river is experiencing heavy meandering resulting loss of agricultural lands and roads located along the banks. Prevailing field information were collected during the field visit. Numerical modeling studies were performed adopting the models HECRAS and Mike 21. Based on the studies vulnerable locations were identified and initial river training works were designed and experimentally verified through physical modeling techniques and finalized. The post effects of the training works are observed which resulted in good accretion. The details of numerical and physical model studies along with post project effect of training works are detailed in the paper.
