Debris Flow Simulation Analysis Based On Unity3D

In recent years,debris flow disaster occurs frequently in south-west mountain district of china which do great harm to the life and financial safety of peoples living in those districts.With the quickly developing of computer calculation,the analogue simulation of debris flow received widespread attention which applied into disaster prevention and relief of debris flow.To realize the simulation reproduce and analytical prediction in the process of debris flow disaster,the project studies the debris flow disaster on the fan-shaped stacking area in the great white mud river of small river domain,Dongchuan district,Yunnan province,simulates the flow state of debris flow in the Fan-shaped stacking area and it's interaction with the houses basing on Unity 3D as the main platform with Debris flow dynamic equation and SPH algorithm.First,the flow model is constructed based on the coroutine and computer Shader,the different improvement methods on CPU and GPU are proposed on the Traversal algorithm of ancestors seeking for the Peripheral particles.Thus,there is better effect if operate SPH algorithm on Computer Shader,In the aspect of solid-liquid coupling,a new method is used to avoid a large amount of calculation and obtain a more real simulation effect.Data in.tiff format of white mud river domain is chosen as the data process,import to ArcGIS to crop out fan-shaped areas,transformed into plain code file by ArcGIS and introduced into Unity 3D to build DEM.After that,GRID model is built by Cube,TIN model is built by Mesh,the advantages and disadvantages of two models are compared and Mesh is chosen as debris flow dynamic simulation.Then a particle emitter is added at the fan-shaped inlet to generate debris flow virtual particles,and judges the debris flow virtual particles flow into the calculation domain then carry out corresponding calculation On the aspect of interaction between debris flow and particles,comparing the ancestors' methods,the interaction between the debris flow and scenery in Unity 3D with physical engine is an effective method.At last,the scenery is built on the basis of scenery and houses,impinge,and special effect of skybox.The paper applies Unity 3D platform into debris flow simulations,on the one hand,it builds the real scenery,on the other hand,it reproduces the flowing and stacking state on the fan-shaped stacking area when debris flow explosion with the interaction of the scenery.It reproduces the scenery and supplies with the decision support for the debris flow disaster prevention and precaution.