基于GLM-PSO-coKriging模型的地表形变研究

Research on Surface Deformation Based on GLM-PSO-coKriging Model

以斜坡灾害易发地带兰州市城关区为研究区,通过PS-InSAR技术提取地表形变点的地表形变速率,反映地质灾害在空间范围内的分布。以协克里金插值为基础,结合广义线性模型(GLM)和粒子群优化算法(PSO),构建PSO-GLM-coKriging插值模型,以地表形变速率为主变量,DEM,岩土疏松度和NDVI拟合参数为协变量,进行空间插值模拟。与co-Kriging模型和GLM-co-Kriging模型相比较,PSO-GLM-coKriging插值模型具有更高的精度和更好的模拟效果,消除了多维度产生的复杂度,改善了小尺度范围内的插值效果,3个模型的误差分别为1.25 mm/year,0.70 mm/year,0.47 mm/year。因此,通过PSOGLM插值模型对形变点空白区的插值模拟,对城关区城镇化的规划建设提供一定的数据和理论支撑。

Taking the Chengguan District of Lanzhou City as a research area in the slope disaster-prone area, the surface deformation rate of surface deformation points is extracted by PS-InSAR technology, and the deformation rate can effectively reflect the distribution and uplifting of geological disasters in the spatial range. Based on the coKriging interpolation, combined with the generalized linear model （GLM） and the particle swarm optimization （PSO） algorithm, the coKrigong interpolation is optimized by fitting the linear model to construct the PSO-GLM-coKriging interpolation model to the surface deformation rate. The main variables, DEM, geotechnical porosity and NDVI fitting parameters were covariates, and spatial interpolation simulations were performed. Compared with the co-Kriging model and the GLM-co-Kriging model, the PSO-GLM-coKriging interpolation model has higher precision and better simulation effect, eliminating the complexity of multi- dimensional generation and improving the small-scale range. Interpolation effect, the error of the three models is 1.25mm/year, 0.70mm/year, 0.47mm/year. By comparison, the PSO-GLM-coKriging interpolation model has higher simulation accuracy and better simulation results. In the overall range, the interpolation results of the three models are similar in spatial distribution, in line with the actual situation of the surface. Therefore, the interpolation simulation of the blank area of the deformation point is carried out by the PSO-GLM interpolation model to fill the gap that the PS-InSAR technology can not extract the surface information at the non-deformation point, and the ground subsidence and uplift with sudden degeneration and sudden landslides will be completed. Geological disasters have been effectively combined, and the coupling relationship between geological disasters with high uncertainty and the monitoring of surface deformation can be established, which provides certain data and theoretical support for the planning and construction of urbanization in Chengguan District.