Table of contents
Topic 1: The application of one-dimensional hydrodynamic model to simulate the flow of a river
Topic 2: One-dimensional complex river network model construction and building settings
Topic 3: Application of one-dimensional water quality model in environmental impact assessment
Topic 4: Construction and verification of planar two-dimensional hydrodynamic model
Topic 5: Application of Plane 2D Hydrodynamic Model in Flood Control Impact Assessment
Mathematical models play an important role in the fields of water environment assessment, flood control assessment, and sewage outfall demonstration. With the continuous increase of human activities and the increasingly prominent environmental problems, the protection and management of water resources and water environment have become crucial. To better understand and address these challenges, mathematical models become a powerful tool that can provide quantitative analysis, prediction, and decision support.
Mathematical models play an important role in water quality, water quantity and aquatic ecology. By establishing a water quality model, we can simulate the diffusion and transfer of pollutants, assess the pollution status of water bodies, and formulate corresponding water quality improvement plans. The water quantity model can simulate the water cycle process of the basin, predict the rainfall-runoff process and groundwater recharge, etc., and provide a scientific basis for water resource management. In addition, aquatic ecological models can help us understand the complexity of aquatic ecosystems, predict species distribution and ecological processes, and provide decision support for ecological restoration and protection.
In the field of flood protection evaluation, mathematical models play a key role in flood simulation and risk assessment. Flood models can simulate the formation, propagation and evolution of floods, and predict the water level, flow and arrival time of floods, thus providing a scientific basis for the planning and management of flood control facilities. At the same time, the flood risk assessment model can combine flood simulation and vulnerability assessment to quantify the impact of floods on the region and help formulate flood risk management strategies.
During the demonstration process of the sewage outlet, the mathematical model can simulate the transmission and diffusion process of pollutants in the water body, and evaluate the impact of discharged pollutants on the water environment. These models can help determine the location, quantity and discharge standards of sewage outlets, optimize sewage discharge strategies, and provide water environment management measures. The water quality assessment model can combine monitoring data and water quality indicators to evaluate the impact of the sewage outlet on the water quality of the water body, judge whether the water body meets the relevant water quality standards, and provide suggestions for improvement.
Commonly used mathematical model software, such as HEC-RAS, MIKE series software, EFDC, DELFT3D, FVCOM, SWAT+, SWMM, EFDC, etc. These mathematical model software cover different fields and application ranges, and provide a wealth of functions and algorithms to support water environment assessment, flood control assessment and sewage outfall demonstration. However, it should be noted that the mathematical model is only one of the auxiliary decision-making tools, and its application still needs to be combined with the actual situation, reasonable setting of parameters and input data, and combination with on-site monitoring. In addition, the accuracy and reliability of the model also need to be continuously verified and improved to ensure the scientificity and effectiveness of its application.
(Required software environment, please prepare by yourself)
Topic 1: The application of one-dimensional hydrodynamic model to simulate the flow of a river
Through example operations, master the modeling methods of MIKE one-dimensional hydrodynamic model (HD), water quality model (AD) and building model (SO) modules of simple river course or complex river network, and master its application in flood control impact assessment and environmental impact assessment And the application in the demonstration of setting up sewage outlets into rivers.
1.1 The overall structure of the MIKE11 model
1.2 Creation of river network files
1.3 Creation of River Section Files
1.4 Preparation of boundary condition files
1.5 Simulation file creation
1.6 Calculation result analysis
Topic 2: One-dimensional complex river network model construction and building settings
Taking the river network model of the Three Gorges reservoir area as an example:
2.1 Production of complex river network files
2.2 Setting of boundary conditions of complex river network
2.3 Building arrangement and its application in flood control impact assessment
Topic 3: Application of one-dimensional water quality model in environmental impact assessment
Taking a river treatment project in Shenzhen as an example, combined with the construction period and operation period project, explain the MIKE11 one-dimensional water quality model in:
3.1 Prediction range of water quality model
3.2 Simulation forecast indicators
Simulation prediction analysis of COD, ammonia nitrogen, SS and other indicators.
3.3 Simulation and prediction conditions
3.4 Analysis of prediction results
Topic 4: Construction and verification of planar two-dimensional hydrodynamic model
Taking the Ma'anshan quarry section of the Yangtze River as an example, explain the grid division of the two-dimensional hydrodynamic model, the setting of boundary conditions, and the verification of the model.
4.1 Determine the model prediction range
4.2 Using MIKE21 Mesh Generator for meshing
4.3 Use MIKE 21 Simulator to build simulation files
Including setting calculation time, roughness parameters, boundary conditions and output file format setting.
4.4 Model Validation
Topic 5: Application of Plane 2D Hydrodynamic Model in Flood Control Impact Assessment
Learn how to use different methods to generalize buildings such as wharves and bridge piers in a two-dimensional mathematical model, and analyze the impact on upstream and downstream flood levels, flow velocity, and flow direction before and after the operation of the project.
5.1 How to generalize wading engineering in MIKE21 model
5.2 Analysis of flood water level changes before and after project operation
Topic 6: Application of Plane Two-Dimensional Hydrodynamic Water Quality Model in the Demonstration of River Sewage Outlets
Using typical cases as textbooks, this paper explains the water environment impact prediction of large-scale river inflow sewage outlets based on two-dimensional water quality models.
6.1 Use MIKE Mesh Generator to divide quadrilateral mesh
6.2 Terrain interpolation
6.3 Calculation working condition design
6.4 Values of boundary conditions
The Pearson III curve is drawn, and the design water level is selected for the water level flow relationship curve.
6.5 Calculation result display and data processing
6.6 Analysis and evaluation of the impact of setting up sewage outlets into the river
