SIMULATION OF INJECTION WELL IMPLEMENTATION TO OVERCOME SEA WATER INTRUSION IN NORTH JAKARTA WITH VARIATION OF INJECTION RATE, AMOUNT OF WELL AND RECHARGE TIME
Ground water used as main source of raw water for most people. Problem that arise is the occurrence of sea water intrusion in North Jakarta decreases ground water quality. The solution offered to overcome intrusion is the use of injection wells. However application in the field is constrained by the...
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| Format: | Theses |
| Language: | Indonesia |
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| Online Access: | https://digilib.itb.ac.id/gdl/view/51806 |
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| Institution: | Institut Teknologi Bandung |
| Language: | Indonesia |
| Summary: | Ground water used as main source of raw water for most people. Problem that arise is the occurrence of sea water intrusion in North Jakarta decreases ground water quality. The solution offered to overcome intrusion is the use of injection wells. However application in the field is constrained by the optimal number, rate of injection and location of wells related to the cost and effectiveness of injection wells. The aim of this study is to model current condition of sea water intrusion, simulate the application of injection wells to overcome intrusion with variables: location, injection rate, number of well and how long injection should be done for unconfined and upper confined aquifer. The research sites cover Jakarta Groundwater Basin area. Modeling was done first by simulating groundwater flow using MODFLOW under steady state, followed by intrusion modeling using SEAWAT. After obtaining the appropriate intrusion model, the application of injection wells is modeled. Variations were made among location of injection wells, recharge rates, number of wells with a simulation time of 10 years. After obtaining optimal results, the recharge time is varied again so that a significant change in the area of intrusion is found.
The results showed for unconfined aquifer, to cope with intrusion in Cengkareng area, additional injection wells are needed by 10 wells with an injection rate of 10 m3/day, 7 wells with a recharge of 50 m3/day and 4 wells with a recharge of 100 m3/day. For Penjaringan it needs 10 wells with rate of 50 m3/day. For Cilincing-Babelan, it takes 15 wells with a rate of 10 m3 / day and 4 wells with a debit of 50 m3/day. The longer the recharge takes place, the less intrusion area found. In upper confined aquifer for Cengkareng area, the intrusion can be overcome after 5 years through the use of 1 injection well with rate of 2500 m3/day. While in Penjaringan area, it takes up to 20 years to push back intrusion area into the sea with 7 injection wells 1500 m3/day. In the Babelan area intrusion can be overcome after 15 years through 4 injection wells with a recharge of 1500 m3/day and 1 well with a recharge of 2000 m3/day. The simulation results are expected to be input for stake holders to deal with sea water intrusion in the North Jakarta area
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