Numerical study of groundwater flow cycling controlled by seawater/freshwater interaction in a coastal karst aquifer through conduit network using CFPv2

摘要: In this study, a groundwater flow cycling in karst springshed and an interaction between two springs, Spring Creek Springs Wakulla Springs, through subground conduit network are numerically simulated using CFPv2, the latest research version of MODFLOW-CFP (Conduit Flow Process). The located marine estuary 11 miles inland, respectively, major discharge spots Woodville Karst Plain (WKP), North Florida, USA. A three-phase conceptual model springs surface water recharge from creek (Lost Creek) was proposed various rainfall conditions. high permeable connecting found by tracer tests cave diving. rate discharge, salinity, sea level tide height at could significantly affect stage simultaneously. Based on model, numerical hybrid discrete-continuum is developed CFPv2 calibrated field measurements. Non-laminar flows conduits exchange porous medium implemented coupling model. Time-variable salinity equivalent freshwater head boundary conditions submarine spring as well changing recharges have significant impacts seawater/freshwater springs' discharges. used to simulate dynamic hydrological process quantitatively represent June 2007 2010. Simulated results discharges match reasonably measurements with correlation coefficients 0.891 0.866 Creeks respectively. rise regional relationship inland evaluated study.