REPRESENTATION OF DAM-BREACH GEOMETRY ON AREGULAR 2-D MESH USING QUADTREE LOCAL MESHREFINEMENT

River hydrodynamicsUnsteady open channel flow and dam brea

Representation of dam-breach geometry on a regular 2-D mesh using quadtree local mesh refinement

River hydrodynamicsUnsteady open channel flow and dam brea

REPRESENTATION OF DAM-BREACH GEOMETRY ON A REGULAR 2-D MESH USING QUADTREE LOCAL MESH REFINEMENT

Summary. A 2D first order upwinding finite-volume scheme is used on a regular orthogonal mesh in a numerical model to simulate dam break and dam breach flow from a reservoir. The discharge through the changing breach geometry is crucial to the accuracy of the resulting flood wave, yet the method of representing the breach by changing the bottom elevation of individual cells within the vicinity of the dam makes the breach hydrograph and peak discharge highly dependent on the mesh size and dam orientation. To increase accuracy and reduce computational burden associated with refining the entire mesh, a quadtree local mesh refinement technique was used to better model the dam breach geometry. Simulation results from the model using a combined regular and quadtree mesh showed that a coarse mesh with local refinement can yield a good approximation of the discharge hydrograph obtained using a globally-refined mesh, with significant savings in computational time

An object-oriented and quadrilateral-mesh based solution adaptive algorithm for compressible multi-fluid flows

10.1016/j.jcp.2008.03.037Journal of Computational Physics227146895-6921JCTP

Representation Of Dam-Breach Geometry Using Quadtree Local Mesh Refinement

Advances in two-dimensional numerical modeling have allodam break floods to be simulated with larger domains than ever before. These types of simulations are important to meet the needs of inundation mapping, consequence analysis, and emergency planning for the large number of significant and high-hazard dams in the United States. Globally refining the mesh to the small cell sizes necessary to resolve small features such as dam breach geometry result in significant computational burden for these types of simulations. This manuscript details the research done to facilitate the implementation of quadtree local mesh refinement to represent dam breach geometry in an existing two-dimensional flood model and to test the model\u27s results and performance with several test cases. Results using local refinement agree with the results of global refinement with a significant reduction in computational burden