Detecting groundwater flow in porous media feeding into a nearby spring

Bali International Geoscience Conference & Exposition (HAGI-SEG)Juli 2010Electrokinetic potentials (EP), sometimes known as streaming potentials, are generated by fluid-flow, heat fluxes, pressure sources and diffusion potentials across boundaries between a fluid electrolyte and mineral grains or rock particles in fractured rocks and porous media. In the electrical double layer model, there is an immobile layer that is divided into two by the Stern plane. The layer nearest the mineral grain is immobile, and the surface of the mineral grain has a net charge so that it adsorbs cations from the fluid in an electrical double layer. Away from the grain boundaries, the mobile part of the fluid may have a surplus of positive or negative ions, depending on the electrostatic charge distribution at the electrical double layer. The excess density of ionic species can be transported with fluid flow producing an advective electric current. The advective flow of charge is balanced by a return electric current; this process is known as coupled flow. The electric potential in the Stern layer varies as a function of distance. The electric potential at the end of slipping plane (the end of the electrical double layer furthest from the mineral grains) is known as the zetapotential (??). To measure such electrokinetic potentials, a good understanding permeability properties of the media porous, particularly the ??-potential and electrokinetic coupling-coefficient are required. \ud \ud The EP phenomenon indicates that there is a relationship between the fluid flow with the electricity potential. Electrokinetic potential at the sub surface of porous media due to the source of self-potential (SP) can be measured on the surface.This research project aims to establish a new technology to detecting fluid-flow and infer hydraulic conductivity from the electrokinetic potential in three approaches. Firstly, measurements of surface self-potentials (SP) in Cibiru Kampung Palalangon Kabupaten Bandung to determine sub-surface fluid-flow as feeding into a nearby spring. Measurements SP will be made using non-polarized electrodes and. This setup measurement SP will allow gradient potential. Data will be sampled at a digital voltmeter (Sanwa-PC500) with resolution of 0,01 mV. The second step of this research will be the investigation of arrow water flow in porous media feeding into the spring. Measurement work will focus on the around area Palalangon. The key part of this measurement SP in Palalangon will be defining where water flow source feeding into the spring. The final aim of this research is to find the trace fault and cave from SP contour data pattern so that we can detecting groundwater flow in porous media feeding into a nearby spring in Palalangon Bandung