冲积扇油气管道坡面侵蚀灾害因子分析

坡面侵蚀是管道破坏的重要地质灾害之一，且其过程复杂，各指标因子相互作用。基于熵权法确定指标权重，距出水口距离所占权重最高，达24%。通过GIS沿管道两侧50 m建立缓冲区，利用空间加权叠加分析，得到缓冲区侵蚀强度。以灾害点侵蚀强度为统计指标，对坡面侵蚀的抗冲性、渗透性、植被、坡度、距出水口距离、水量6类指标进行统计分析。结果表明，坡面侵蚀强度与渗透性、坡度、水量呈现较好的正相关；抗冲性、植被与侵蚀强度具有一定程度的负相关关系；整体而言，侵蚀强度随距出水口距离的减小变高。

Analysis of Disaster Factors of Slope Erosion for Oil and Gas Pipelines Crossing Alluvial Fans

Slope erosion is one of the major geological disasters that causes pipeline damage. The damage induced by slope erosion involves a complex process and is affected by multiple indicator factors. In this study, the weights of each indicator factor are determined based on the entropy weight method. The distance to the water outlet is found to possess the highest weight of 24%. Furthermore, a 50 m buffer zone is constructed along the two sides of pipeline using GIS. The erosion strength of the buffer zone is obtained by performing a spatial weight stacking analysis. Taking the erosion strength of the disaster site as a statistical indicator, we performed statistical analyses of six parameters, including the impact resistance of slope erosion, permeability, vegetation, slope, distance to water outlet, and water volume. The results show that the slope erosion strength is positively related to the permeability, the slope, and the water volume. The impact resistance and vegetation are found to be negatively related to the erosion strength. In summary, the erosion strength becomes stronger with decreasing distance to the water outlet.