http://117.252.14.250:8080/jspui/handle/123456789/6853 Sun, 05 Apr 2026 19:42:39 GMT 2026-04-05T19:42:39Z http://192.168.134.211:8080/xmlui/bitstream/id/fe6ed24f-a0f4-44a9-b7d0-7ae892dfe202/Cover.jpg http://117.252.14.250:8080/jspui/handle/123456789/6853 http://117.252.14.250:8080/jspui/handle/123456789/6859 Contents National Institute of Hydrology Sat, 01 Jan 2005 00:00:00 GMT http://117.252.14.250:8080/jspui/handle/123456789/6859 2005-01-01T00:00:00Z http://117.252.14.250:8080/jspui/handle/123456789/6858 1-Management of South Chennai Coastal Aquifer System - A Multi Objective Approach. Mohan, S.; Pramada, S. K. Many coastal areas in the world are dependent on local fresh groundwater resources because of heavy urbanization. Due to constant pumping and improper management, the South Chennai aquifer is facing a severe threat of being contaminated by seawater. In order to study the extent of seawater intrusion, the parameter C1/(HCO3+CO3) is taken as a solute and the indicator of seawater intrusion and analyzed through SEA WA T Model calibration has been carried out using the data pertaining to the period 1990-2002. Model prediction has been done upto the year 2010 with management strategies such as modernizing existing tanks, construction of a semi pervious barrier and optimization of pumping quantities. Management of seawater intrusion is a multi objective decision problem. The problem has been formulated as a multi objective optimization problem consisting of two objectives such as maximization of pumping and minimization of total cost of desalination considering the constraints on water levels and pumping. Multi objective interactions between the various trade-offs have been analysed using multi objective evolutionary algorithm. Sat, 01 Jan 2005 00:00:00 GMT http://117.252.14.250:8080/jspui/handle/123456789/6858 2005-01-01T00:00:00Z http://117.252.14.250:8080/jspui/handle/123456789/6857 2-Seawater Intrusion Due to Freshwater Draft in Coastal Aquifers. Rao, K. Nageswara; Mahesha, A. Freshwater pumping from coastal aquifers need to be properly planned to avoid aggressive seawater intrusion into freshwater aquifers. A Galerkin finite element model with sharp interface approach is adopted to simulate the seawater freshwater dynamics in coastal phreatic aquifers due to freshwater draft. The model considers a hypothetical aquifer to analyze the effect of freshwater pumping on seawater intrusion. The results indicated that freshwater withdrawal from the seawater intruded zone (two fluid zone) need to be carefully monitored to avoid seawater upcoming which will pollute the overlying freshwater zone. The effect of freshwater withdrawal on the seawater freshwater dynamics decreases for locations farther from the intruded zone. Sat, 01 Jan 2005 00:00:00 GMT http://117.252.14.250:8080/jspui/handle/123456789/6857 2005-01-01T00:00:00Z http://117.252.14.250:8080/jspui/handle/123456789/6856 3-Seawater Intrusion Mapping Using Modified GALDIT Indicator Model - Case Study in Goa. Chachadi, A. G. An indicator-based model is presented to assess and quantify the vulnerability magnitude of coastal aquifers to seawater intrusion due to excessive groundwater withdrawals or possible rise in the sea level. The new method, GALDIT, of aquifer vulnerability mapping due to seawater intrusion, has been successfully used to assess the extent of aquifer contamination due to seawater intrusion. The maps derived can be used as a tool for management of the coastal groundwater resources. Similar applications can be carried out for the island aquifers so that optimal management practices can he evolved for groundwater use. The paper discusses application details of the model to a region in North Goa. Sat, 01 Jan 2005 00:00:00 GMT http://117.252.14.250:8080/jspui/handle/123456789/6856 2005-01-01T00:00:00Z