河道二维数值模拟地形数据前处理精细化研究

Refined Pre-processing of Topography Data for 2D Numerical Simulation of River Channel

数值模型是分析河流水动力水质演变规律的重要方法。通过对MIKE21模型边界等间距取节点,并进行编码,实现实测河道断面地形沿河道弯曲方向的精细化插值,为河道数值建模提供优化后的地形数据。为了说明此方法的优越性,选取荆门城区某河流部分河段作为研究对象,利用Python完成程序的编写,对实测河道断面数据进行精细化插值运算,并对比地形精细化处理前后与实际地形的差别。结论认为,经过对6组断面插值运算,河道地形得以细化,减少了模型运算错误率,使得模型更趋近于真实情况。

Establishing a numerical model is an important approach of analyzing the evolution law of hydrodynamics and water quality of river.In the purpose of providing optimized topography data for numerical model,the nodes of the MIKE21 model boundary are equally spaced and coded to interpolate the measured topography of river section along the river bend direction.To verify the superiority of this method,a river segment of Jingmen City is selected as research object to illustrate the interpolation of topography data by Python programming.The terrains before and after the refinement processing are compared with the actual terrain.Results suggest that after the interpolation of measured cross-section,the river topography is refined,the operational error rate of model is reduced,and the modeling result is closer to the real situation.