Research On 3D Modeling And Visualization Method Of Groundwater System In Karst Area

Guizhou Province is located in the southwest of China's karst rock mountain center,the problem of the shortage of water in karst area curb the province's economic and social development.On the total water resources advantage of karst area,has created serious water shortage problem.The hydrogeological conditions of the karst area are complex.At present,the systematic basic hydrogeological data is still dominated by the small scale regional hydrogeological survey,which can't meet the contemporary economic and social development planning and the requirements of the development and protection of groundwater resource exploration.In this case,it is of great significance to study the 3D visualization of groundwater system in karst area.It can provide abstract 2D drawings information intuitively to decision makers in non-professional waterfront layouts,as well as to facilitate technical collaboration between professionals and non-professionals.These will help to analyze the problems existing in the karst area and propose solutions.This paper selects the bauxite cat field mining area in Qingzhen City in Guizhou for research object.Taking the survey results of the region as the source data,we combined with computer graphics,computer simulation technology and GIS related technology,and based on the research of Open GL graphics API and development of the "three-dimensional visualization system of karst groundwater" to realize three-dimensional visualization of hydrological data.In the 3D display of aqueous media,the reliable ASTER GDEM data are used to test,and the appropriate interpolation parameters are selected by statistical method.The secondary interpolation of the surface grids is carried out by using the improved inverse distance weighted interpolation method.In the aspect of modeling the aqueous media,the design method of the auxiliary virtual drilling and the three-dimensional realization technology of the stratigraphic fault are explored by the idea of the whole method.In order to show the reality physical characteristics of the water system,the "3D simulation subsystem of surface water" is developed on the original system,so that the observer could observe the surface water and underground water-bearing space with the observation angle.The river range is established by the breadth-first search method,and the earth surface flow is established by the propagation disturbance of the sinusoid wave.In addition,three-dimensional groundwater's phreatic water contour is displayed in the subsystem.The karst aquifers are expressed by spatial diversity and we use the corrosion algorithm to achieve the three-dimensional expression of the hole.3D karst underground river model is established by 3ds Max,and the method of converting to 3D system is studied.In this study,we take the automated modeling as design goals.The 3D expression of the aqueous medium and the water system and the visual operation of the model are realized by the automatic modeling as the design goal.The visualization system works well,the model and the source data are realistic,the visual operation type is complete,and the theory and method are reliable.It explores the 3D expression scheme of the geological elements in the karst area to a certain extent.