RESEARCH TO DEVELOP A TWO-DIMENSIONAL (2D) PROGRAM FOR SALINE INTRUSION SIMULATION

Abstract

The article presents in details the numerical method for solving the salinity transport problems in the conditions of actual river system based on the 2D shallow water equation and the convection diffusion one. The method is applied to simulate the salinity intrusion in the Ninh Cơ river (Nam Định province). In this method, the finite volume method combined with HLLC method (Harten - Lax - Van Leer - Contact) were employed to compute the fluxes of the Riemann problems. Its approximate solution helped the estimation of the stability, meeting the balancing condition including in the wetting-drying cases for 2 adjacent grid elements. Based on that, the program calculated the open source code written by the C++ program. Comparing caculated results and observed ones, actual measurements in the Ninh Cơ river and the simulated results by the MIKE 21FM showed that the model is applicable to simulate the 2-dimensional salinity spread problem in actual river conditions.