THE EXPERIMENTAL STUDY OF SOIL CEMENT BULKHEAD MODEL TO REDUCE SALTWATER AT COASTAL AQUIFER

Artificial barrier on sub surface ground is one of seawater intrusion control methods physically in the coastal area.. This study aims to asses the effect of soil cement insulation as a barrier subsurface intrusion against saltwater intrusion into freshwater at Coastal unconfined aquifer. The research was conducted by testing experimental models in laboratory with 4 variation of insulation's depth (D) and 3 variation insulation width (B). This study uses coastal sand as the basic material for making the aquifer model with 0,031 cm/s. Water used is freshwater with specific gravity 1,000 gram/cm3 and saltwater with specific gravity 1,025 gram/cm3 and insulation barrier by mixture cement-water 1 : 6.The results indicate that artificial barrier subsurface by soil semen insulation can reduce the length of saltwater intrusion. With increasing value insulation dimension (depth and width), While at D = 2 cm the length of intrusion reduce 8,08%. D = 5 cm length of intrusion reduce 18,70 % and D = 10 cm length of intrusion reduce 46,24 %