Sequence stratigraphy was a study of layered rocks that form in some period of time. It was proven to be a useful tool in industry, especially oil industry. Yet, sequence stratigraphy most people have seen was the result, not the process. Of which, this study wanted to replicate the process that was taken place in sequence stratigraphy in a smaller scale of a laboratory. To replicate sequence stratigraphy, this study used a flume tank device filled with sand and water flowing with controlled rate. This study makes changes in water level in the flume tank to affect accommodation space, on which sedimentation happens, thus, making some morphological change known as progradation and retrogradation. Changes were recorded using time lapse camera and measured using laser distance meter to see how much the morphology had changed after some period of time. Result of this study showed that transgression and regression could be replicated inside the flume tank by changing the height of water level. Though the time scale could not be made close to real condition, but the process and the result could. This would help understanding sequence stratigraphy not only from the outcrop but also from the series of the process that made it.

Jakarta is a large city with a 10.37 million population. Most of the clean water needs are provided via groundwater. This might be a problem for some areas with groundwater conditions such as brine, or even salty water. The salt-water issue in Jakarta is not uncommon. Many researchers have conducted their studies on this topic from many perspectives. They are all divided into 2 main general conclusions, saltwater happens because of intrusion and saltwater is there because it is connate water. This study aims to give a new perspective on understanding the salt-water issue. Methods used for this study are gravity measurement to get a horizontal gradient value. The other is groundwater well sampling to measure the value of pH, salinity, conductivity, and water table elevation. These methods will be comprehensively interpreted to get the direction of subsurface fluid flow. Results from salinity and conductivity of groundwater show more salinity and conductivity in the North direction and less on the South one. Gravity data and the geological map also suggest that there is a fluid flow coming from North East to South West. All of these methods used in this study have come to one conclusion, there is water flowing from the sea to the land, therefore there is a most likely saltwater intrusion on the region where this study is conducted.