Shallow Lake Mesh Remodeling for Accurate Dike Hydrodynamics
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Solution Overview
Problem
Existing hydrodynamic models for shallow lakes with complex terrain, such as Baiyangdian, face large data calculation volumes due to uneven boundary lines of dikes and embankments, leading to inaccurate water-blocking effects and increased computational load.
Innovation Solution
Optimize meshing by taking the midline of original boundary lines and offsetting them to form equidistant double boundary lines, then import this new topographic map into meshing software for re-meshing, forming uniform triangular cells that accurately represent dike and embankment elevations, reducing computational load while maintaining accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If original boundary lines of dikes and embankments are used for meshing, then the terrain representation is detailed, but the data calculation volume becomes large
Solution Approach 1:
The patent extracts only the essential geometric information needed for hydrodynamic simulation by taking midlines of dike and embankment boundary lines, removing redundant detailed boundary information that increases calculation volume without significantly impacting simulation accuracy
Solution Approach 2:
The patent segments the complex boundary lines into simplified midline representations, dividing the terrain into distinct regions (water body, dike/embankment, land) based on midline positions, thereby reducing the overall data complexity while preserving essential terrain features
2Productivity
If midlines of boundary lines are used to reduce calculation volume, then computational load decreases, but the water-blocking effect is insufficient
Solution Approach 1:
The patent transitions from representing dikes and embankments as one-dimensional midline features to creating two-dimensional mesh regions by offsetting midlines and generating equidistant double boundary lines, thereby restoring the water-blocking capability in the horizontal plane while maintaining computational efficiency
Solution Approach 2:
The patent applies different meshing strategies to different regions: equidistant double boundary lines are generated specifically for dike and embankment areas to ensure water-blocking effect, while other regions use standard meshing approaches, optimizing both accuracy and computational efficiency locally
3Adaptability or versatility
If unstructured meshes are used for complex terrain, then the terrain complexity is handled better, but the meshing complexity increases
Solution Approach 1:
The patent performs preliminary processing of boundary lines by taking midlines and offsetting them to create equidistant double boundary lines before meshing, preparing the geometric data in advance to simplify the subsequent unstructured mesh generation process and reduce overall meshing complexity
Data Source
AI summary
Provided are a method for optimizing meshing and establishing a hydrodynamic model of a shallow lake model, relating to the technical field of numerical simulation for rivers and lakes. The method for optimizing meshing of a shallow lake model includes the following steps: S110: obtaining a topographic map; S120: taking a midline of an original boundary line of each dike or embankment in the topographic map; S140: offsetting the midline by a preset distance to form a new topographic map with equidistant double boundary lines; and S160: importing the new topographic map into meshing software for re-meshing to obtain a mesh file of a simulation area. The method for establishing a hydrodynamic model includes the above method for optimizing meshing of a shallow lake model.