MODELING OF GROUNDWATER HYDRODYNAMICS IN FLOODED AREAS

Problem statement. The task of calculating the dynamics of groundwater in the flooded area during the operation of local drainage is considered. The difficulty of solving this problem consists in the fact that in the presence of building on the flooded territory, it is impossible to use the existing regulatory methods for calculating the drainage. Therefore, there is a need to develop specialized mathematical models for evaluating the change over time in the groundwater level in the flooded area. The purpose of the work is to develop a numerical multi-parameter model and create a computer code based on it to predict changes in the level of groundwater and the level of pollution of the underground aquifer during the operation of drainage in a flooded area. Methodology. The filtration equation for headless underground flow is used to calculate the dynamics of groundwater during the operation of water-lowering wells. A two-dimensional mass transfer equation is used to calculate the impurity concentration in groundwater during the operation of the drainage system, which takes into account the convective transport of the impurity and the transport of the impurity due to dispersion. A locally one-dimensional finite-difference splitting scheme is used for the numerical integration of the filtration equation of headless groundwater. Finite-difference splitting schemes are used for numerical integration of the mass transfer equation of impurities in groundwater during drainage operation. Scientific novelty. An effective numerical model is developed, which allows predicting the change in the level of groundwater during the operation of local drainage. The model also makes it possible to predict the level of groundwater pollution during drainage operations. Practical value. Based on the developed numerical model, a computer code was developed, which is oriented towards the solution for a complex of applied problems related to the design of local drainage systems in flooded areas. Conclusions. A numerical model and computer code is developed that allow to evaluate the dynamics of changes in the groundwater level and the intensity of their pollution during the operation of local drainage. The results of the computational experiment are presented.