Groundwater modeling in Yogyakarta urban area, Indonesia

HUYEN, Dang Thuong, Dr.Ir. Heru Hendrayana

2007 | Tesis | S2 Teknik Geologi

Being located in the crowded area with many human activities, Yogyakarta Urban Area is facing on many groundwater problems. The human activities that influence to groundwater including extraction of groundwater, discharge polluted water from industries, hotels and other services. Although the groundwater degradation has not produced severe harmful impacts in this area yet, it, nevertheless, takes the huge money from human to solve these problems. In the present, this area should be managed is the best way to protect groundwater resource. This present study aims at producing groundwater modeling for the study area. The analyses of geological, hydrogeological map, aquifer characteristics, the surface water and groundwater interaction investigation, sources recognition, borehole drilling, lithological log were conducted in this research. Moreover, groundwater system was simulated is an upper part of unconfined aquifer. Groundwater model has been done with two scenarios, one in next 5 years and another one in next 10 years in steady - state. Almost aquifer system material is medium - coarse sand with the bottom of aquifer was assumed. The groundwater flows from the north to the south. The particle tracking model was also carried out with the principle of convection or advection process in the steady - state. The solute contaminants trend to groundwater flow direction. The particles of contaminants can move from the central of the study area to the southern boundary within 3 years later. The distance of particle movement is directly proportional to the time. Together with the human activity growth, water table in the study area can be dropped down excess 5 meters in the next 10 years. The outcomes of this research can be utilized for the strategies of sustainable groundwater management in Yogyakarta Urban Area.

Kata Kunci : Peta Hidrogeologi,Air Bawah Tanah, aquifer characteristics, groundwater modeling, convection principle, particle tracking