Numerical simulation of groundwater system, numerical simulation and prediction of groundwater

Scenarios and results for simulated forecasts.

It can be seen from the operation results of the numerical model of groundwater flow that under the current mining conditions, there are no serious environmental geological problems such as aquifer dredging and land subsidence in the urban area of Jilin City. The groundwater level in the study area is affected by precipitation, and the water level can be restored to a certain extent during the wet season. However, when the emergency water source in the study area is put into operation, a landing funnel will inevitably be formed.

Therefore, the prediction of the dynamic change of groundwater level in the study area has a good early warning effect on preventing the occurrence of environmental geological problems in the study area, which is conducive to the sustainable utilization of groundwater resources in the urban area of Jilin City.

In this chapter, the above calculated extraction volume is input into the model, and the boundary conditions of the numerical model, aquifer parameters and other source and sink terms are kept unchanged, and the dynamic change of groundwater level in the study area in 2015 is forecasted.

**The results are shown in the figure.

Analysis of simulation forecast results.

As can be seen from the figure, if the mining volume is 10,000 m3

In 2015, the average water level drop in the study area was 2 3 m, and the average water level drop in Jiangbei District was 4 6 m. This is mainly due to the dynamic change of groundwater level in the study area after the emergency water source is put into operation. From the perspective of the entire simulated ** area, the aquifer in Jiangbei District is thicker, and most of the area is between 15 and 30m.

Therefore, there is still potential for further mining in Jiangbei District, but the thickness of most of the aquifers in other areas is between 2 16 m, and the potential for further mining is very small.

Introduction.

Chapter 1 Mathematical Models.

Chapter 1 Basic Equations.

Continuum medium. Water flow equation.

Determine the solution conditions. The basic process of numerical simulation.

Chapter 2 Groundwater Flow Modeling.

Saturated water flow model (single phase).

Two-phase immiscible seepage model.

Unsaturated water flow model.

Model of land subsidence.

Chapter 3 Models of solute transport and heat transport.

Saturated zone solute transport model.

Cation exchange issues.

Salt water brine intrusion problem.

Deep well underground perfusion.

Heat migration in saturated zones and energy storage in aquifers.

Model of solute transport in the unsaturated zone.

Part 2 Numerical Methods.

Chapter 4 Finite Difference Method (Water Flow Problems).

Basics. Two-dimensional seepage problems.

Three-dimensional seepage problems.

Problems with moisture movement in unsaturated zones.

Chapter 5 Finite Element Method (Water Flow Problems).

Basic principle. element series, interpolation functions, and corresponding finite element equations.

The finite element method for solving two-dimensional seepage problems.

The finite element method for solving the three-dimensional seepage problem.

Handling of some specific issues.

Storage of coefficient matrices and solutions to systems of linear algebraic equations.

Chapter 6 Numerical Solutions to Groundwater Quality and Heat Transport Problems Chapter 7 Application of Finite Difference Method and Finite Element Method.

Chapter 8 Hybrid and Multiscale Finite Element Methods.

Chapter 9 Other Numerical Methods.

Chapter 3 Numerical Methods for Inverting Parameters.

Chapter 10 Numerical Methods for Solving Inverse Problems.

Chapter 11: Sensitivity Analysis and Model Uncertainty.