A Branched Mass Transport Model of the Sacramento-San Joaquin Delta, Californiaby Henry F. N. Wong, U.S. Bureau of Reclamation, Sacramento, United States,
Abstract: A new branched mass (salt) transport model is used to simulate salt transport in the Sacramento-San Joaquin Delta, California. The model uses a two-step procedure to determine the salt transport in a branched system. At the interior grid points, salt transport is determined by solving an one-dimensional advection-dispersion equation using an Eulerian-Lagrangian method (ELM). Salt transport at the junctions is determined by an extension of the ELM and by the application of a conservative-of-mass equation. The ELMs permit the use of larger time steps such that the resulting grid Courant numbers are greater than one. As a result, there are corresponding improvements in both efficiency and accuracy. The paper describes the numerical details of the model algorithm and presents the results of comparing a model simulation with available measurements of salinity concentrations in the Delta.
Subject Headings: Mass transport | Hydrologic models | Numerical models | Salts | Simulation models | Mathematical models | Grid systems | Advection | North America | California | United States | Sacramento
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