ESTIMATION OF TOTAL VOLUME OF SEDIMENTS IN SALAULIM RESERVOIR USING ANN MODEL

Abstract

Reservoir sedimentation has become a critical issue these days. The life of reservoir at planning is not the same after construction. There is a loss of storage capacity because of volume of sediments deposited and evaporation taking place throughout the area of reservoir. Thus, reduction in capacity of reservoirs also decreasing the useful life of the reservoirs. Volume of sediments deposited in a reservoir is the major role that reduces the storage capacity of reservoir. In my present study, volume of total sediments deposited in the Salaulim reservoir is estimated using different methods such as siltation rates and ANN model. The results of these methods have been compared with the results got from equation ( Vs = KT0.66) given in report of Salaulim Reservoir, Goa provided by CWC. In the present study, 21 years data of Salaulim Reservoir is used. Volume of sediments deposited in a Salaulim Reservoir was estimated using siltation rate. The annual siltation rate of Salaulim Reservoir was found to be 6.75 mm/year in 21 years. Volume of total sediments deposited was also estimated by the equation. The results of both methods were compared. The regression coefficient was found to be 0.976. Again the results from the equation were compared with the estimated value of volume of total sediments deposited in a Salaulim Reservoir by ANN model. The regression coefficient was found to be 0.998. A feed forward three layered ANN model with back propagation algorithm was developed. The data was trained using Levenberg Marquardt process. The training was stopped when MSE was 0.01. In the present study, ANN model performed better than the method of siltation rates. It is fast and can solve complex problems. The volume of sediments deposited in Salaulim Reservoir estimated in 21 years was 29.61 M.Cu.m. The estimated life of the Salaulim Reservoir was 150 years.