A FEASIBILITY TEST ON AN ARTIFICIAL RECHARGE SYSTEM FOR ONE REPRESENTATIVE GREENHOUSE COMPLEX ZONE (Invited Presentation)

This study was conducted to examine an artificial recharge system which was considered to be an alternative for securing additional groundwater resources to one high-density greenhouse complex zone. An injection well with a depth of 14.0 m was placed in an alluvial plain of the zone. Eight monitoring wells were placed in a shape of dual circles around the injection well. Aquifer tests demonstrated hydraulic conductivities ranging in 1.5×10^-3~2.4×10^-2 cm sec^-1 and storage coefficients ranging in 0.07~0.10, indicating characteristics of a relatively high-permeable layer. A step injection test resulted in a specific groundwater-level rising (S_r Q^-1) values ranging of 0.013~0.018 day m^-2 and 64~92% of injection efficiencies. Results of a constant-rate injection test with an optimal injection rate of 100 m³ day^-1 explained an enormous storage capacity of the alluvial aquifer during ten experimental days. During the constant-rate injection test, most of hydro-physical properties including pH, EC, and temperature was stable in dual monitoring wells whereas dissolved oxygen (DO) value slightly increased due to an injection of surface water with high DO concentrations. For drawing a detailed design on an artificial recharge, the high permeable layer should be isolated by dual packers and suitable pressure should be applied to the injection well in order to store water. An anisotropy ratio of the alluvial aquifer was evaluated to be approximately 1.25 : 1 with an anisotropy angle of 71 degrees.

This study was supported by Korea Institute of Planning and Evaluation for Technology in Food, Agriculture and Forestry (IPET) through Agricultural Facilities and Disaster Management Technology Development Program, funded by Ministry of Agriculture, Food and Rural Affairs (MAFRA) (grant number 320052-3).