内河航道地形克里金插值方法应用研究

Research on application of Kriging interpolation method for inland waterway topography

针对内河航道离散河床测量地形难以适应水动力模拟精度的问题,开展克里金插值技术在内河航道高精度地形构建中的应用研究。以巢湖某支流航道为例,采用克里金方法分别对顺直段及弯曲段水下地形进行插值。在对水下地形空间变化趋势进行分析的基础上,选取不同理论变差函数模型,并考虑模型的各向异性特征,对河床地形插值结果进行对比分析。结果表明:去趋势项和各向异性模型能够显著改善插值结果中的局部不连续现象,而克里金插值结果精度和连续性仍有待进一步改善,研究成果可为今后的克里金插值技术深化应用提供借鉴。

Aiming at the problem that the discrete measured data of river bed in inland waterway is difficult to adapt to the accuracy of hydrodynamic simulation,the application of Kriging interpolation method in the construction of high-precision topography of inland waterway has been carried out.Taking a tributary channel of Chaohu Lake as an example,the Kriging method was used to interpolate the underwater terrain of the straight section and the strong curved section respectively.Based on the analysis of the spatial variation trend of underwater topography,different theoretical variogram models were selected,and the anisotropic characteristics of the models were considered to compare and analyze the results of river bed topography interpolation.The results show that the detrending method and the anisotropy model can significantly improve the local discontinuity in the interpolation results,while the accuracy and continuity of the Kriging interpolation results still need to be further improved.The research results can provide a reference for advancing the application of Kriging interpolation technology in the future.