The interconnection of the Volcanic Aquifer Layers Influences Interaction of Hydrogeological and Hydrology Systems of Cisadane River Singgih Irianto T.H1*, Sari Bahagiarti. K2, Carolus Prasetyadi3,Yatini4, M. Agus Karmadi5
Geological Engineering, UPN VETERAN Yogyakarta, Yogyakarta, Indonesia- and
Geological Engineering, University of Pakuan Bogor West Java, Indonesia
Abstract
Abstract. The research location is the South Bogor Groundwater Basin (CAT) in the Upper Cisadane Sub-watershed, physiographically it is part of the Quaternary volcanic zone, and there are several Quaternary volcanoes including Mount Salak and Mount Pangrango, both of which are strato-type volcanoes. There are approximately multiple layers, in the form of confined aquifers and unconfined aquifers. Lithological facies through surface geological mapping, aquifer layer analysis through subsurface geological mapping using 1D and 2D geoelectric methods. Hydrogeological observations, observations of springs, dug wells and deep wells, groundwater levels, physical properties, and taking samples of groundwater and river water for hydrochemical analysis, as well as measuring, isotop 18O, 2H, and radon (222Rn) concentrations in groundwater and surface water. The aim is to identify interactions between groundwater and surface water in the upper Cisadane River. The research results show that the genesis of groundwater in dug wells, springs, and drilled wells originating from the aquifer system is not stressed, the genesis is the same as the genesis of surface water in the Cisadane river. So it can be concluded that groundwater is in the unconfined aquifer, and B has a surface water hydraulic interconnection in the upper Cisadane River. Knowing the relationship between hydrogeological systems and river hydrology is necessary to build a hydrogeological system on the eastern slopes of Mount Salak and the western slopes of Mount Pangrango, for sustainable water resource management.
