基于断面地形法和网格地形法的河道冲淤计算分析

摘要

The riverbed erosion-deposition amount and its distribution is the basis for engineering design , flood prevention and deci-sion-making.In practice, the section topographical method is widely adopted in the calculation .With the development of GIS tech-nology, modeling and analysis of 3D surface has been gradually mature , which creates the condition for promotion of grid topographi-cal method.In this paper, the riverbed erosion-deposition amount has been calculated and comparative analyzed based on section topographical method and grid topographical method .By analyzing error source and solution method , estimating suitability and relia-bility, it is shown that the grid topographical method based on GIS has higher visualization , efficiency and accuracy .%河道的冲淤量及其分布是相关工程规划设计和防洪决策的基本依据，在生产实践中，冲淤计算一般是采用断面地形法。随着GIS技术的发展，三维表面的建模和表面分析已逐渐成熟，为推广网格地形法计算河槽冲淤量创造了条件。该文通过对比断面地形法、网格地形法两种方法计算的河道冲淤量，分析其误差来源及解决方法，评估其方法的适宜性和可靠性，得出GIS支持下的网格地形法计算河道冲淤可视化强，提高了效率和精度。