Simulated groundwater tracer study of the Alamitos Barrier Project, Los Angeles, California
Pope, Joseph Christopher.
MetadataShow full item record
A simulated tracer study is performed on the Alamitos Groundwater Barrier Project (ABP), Los Angeles, California. The ABP consists of 43 injection wells that create a freshwater barrier to prevent intrusion of seawater into the coastal aquifer of southern Los Angeles County. The injection wells currently use a blend of recycled and imported water. Regional water quality regulations dictate the quantity of recycled water that can be injected into the aquifer. The regulations also require that the travel-time between the injection wells and the local production wells be greater than one year. The purpose of this study is to analyze the travel time of injected water into the ABP. A previously calibrated three-dimensional, finite element, coupled groundwater flow and transport model is used to simulate the movement of a conservative tracer in the Alamitos Barrier Project. The results of the simulations show that tracer travel times between the injection wells and the production wells typically exceed 60 years. The model results exhibit a high amount of numerical error when large time steps are used. Time-step sensitivity analysis indicates that a time step of one day or less will minimize model error. Further analysis of local head boundary conditions is recommended in order to provide a wider range of tracer travel times given variations in boundary hydraulic head levels.
CIVINS (Civilian Institutions) Thesis document
RightsThis publication is a work of the U.S. Government as defined in Title 17, United States Code, Section 101. Copyright protection is not available for this work in the United States.
Showing items related by title, author, creator and subject.
Push-pull test for in situ determination of microbial metabolic activities: denitrification and methanogenesis Odenthal, Paul James. (Monterey California. Naval Postgraduate School, 1995);Quantitative information on subsurface microbial processes is needed for many applications, but information obtained by existing methods can be difficult to interpret. The goal of this project was to develop a single well, ...
McElwain, Brian D. (2002-06);Serpentine inlet ducts on modem tactical aircraft distort the inlet flow and decrease pressure recovery at the aerodynamic interface plane (AIP). Current inlet designs are more aggressive, increasing distortion and decreasing ...
Phua, Weiyou Nicholas (Monterey, California: Naval Postgraduate School, 2015-09);For all purposes and intents, being able to infer the topology of a network is crucial to both operators and adversaries alike. Tracer-oute is a common active probing technique but it may be subverted by deceptive responses. ...