Simulation of Saltwater Intrusion in a Coastal Aquifer Chennai, India

Abstract

SEAWAT-2000 is employed to reproduce groundwater movement and migration for a coastal stretch in the Chennai city, India. SEAWAT coupled interpretation of MODFLOW and MT3DMS can recreate 3-D model, variable thickness, groundwater flow and multi-layer transport. The variable thickness flow strategy uses the MODFLOW framework to decide the variable thickness flow condition. The aquifer considered for the present investigation is ~ 75 km coastal area from southern Thiruvanmiyur to northern Thiruvottiyur. The analysis considers about managing the available data most capably to create an intense and complex propagation model. The game plan parameters are quantifiable by altering the model for multi-year outputs with consistent time step. The idea is to recharge the unconfined strata using wise groundwater potential of the aquifer with progression of transmissivity and unambiguous yield for weathered, fractured aquifer alluvium and Gondwana formations starting from 2 to 143.2 m 2 /day along and 0.00075 to 0.2 independently. The model evaluates the extent of above mentioned study area with the targeted accuracy by segregating the data. From this, the model is perceived to be tentatively steady for any groundwater applications and associated with foreseeing the water incursion in beach front aquifers for various strategy and overall water level rising.