A Real-time and Efficient Visual Simulation Method for River Basin Flood Evolution

Abstract

The invention relates to a real-time and efficient drainage basin flood routing visual simulation method. The method comprises the steps that grid control sections and nodes are acquired; a river regime fitted curve is determined; an encrypted section is generated; the grid control sections and the encrypted section are processed; a node grid is generated through interpolation; a digital riverway model is generated; section water level data is acquired; a section water level matched with the digital riverway terrain grid is generated through interpolation; submerging lines of a single riverway or tree-shaped river network or annular river network are determined; the topological relation between the riverway submerging lines is built; an inundated area is determined; riverway water flow routing visual display is carried out. According to the method, the flood routing condition of a drainage basin can be displayed efficiently in real time, a continuously changing flood inundation layer can be created, the local or full-area inundated area is stereoscopically observed according to the elevation of the water surface, the superficial area and water storage of flood water surface inundation at a certain elevation can be calculated in real time for a local flood inundation region, the method directly serves drainage basin flood control and disaster reduction, and important theoretical and practical significance is achieved on disaster reduction capacity improving.

Description

technical field [0001] The invention belongs to the field of visual simulation of flood evolution, and relates to a real-time and efficient visual simulation method for river basin flood evolution, which is a visual simulation method for river basin flood evolution based on numerical simulation and measured data, and a river basin flood evolution based on parallel processing architecture Visual simulation methods. Background technique [0002] The simulation of watershed flood evolution is driven by observation data and calculation of hydrological and hydrodynamic models. In the computer-generated virtual watershed environment, the three-dimensional and intuitive dynamic simulation simulates the spatiotemporal evolution process and inundation status of floods in real river channels. Due to the dynamic changes of incoming water and sediment conditions, and the interaction between water flow and basin topography, there are uncertainties in the submerged area of ​​the river cha...

AI Technical Summary

Problems solved by technology

Most GIS software uses manual intervention to deal with active inundation, but the scalability and adaptability are not strong; in recent years, the more representative automatic processing methods for active inundation problems are the seed spreading method and the method of throwing stones.

Although these algorithms can identify flood submerged areas, they still have the following deficiencies: ① It is necessary to continuously and repeatedly detect submerged and connected areas. Rendering is inefficient

②The smallest unit used for calculation and display is a regular or arbitrary polygonal grid. The coarser grid unit not only makes the expression accuracy of the submerged area very low, but also causes obvious errors in the expression of the connectivity of the submerged area

③Flood inundation area is realized based on the "horizontal plane" method, which lacks the corresponding physical mechanism. It is contrary to the actual situation when it is transplanted into the river course or river network flood simulation, especially when the water surface slope is large, it will lead to false flooded area

④ In the processing of submerged areas, due to the lack of consideration of the submerged situation in adjacent times, the submerged situation of disconnected depressions cannot be correctly processed

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