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基于GIS和层次分析法的冲积扇油气管道段坡面侵蚀性评价 被引量:4

GIS and AHP based slope erosion analysis for the oil and gas pipeline across alluvial fan
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摘要 坡面侵蚀是管道穿越冲积扇地质灾害的重要类型之一。通过对青海省乌兰县希里沟北山山前冲积扇油气管道建立坡面侵蚀单体模型,以遥感影像解译为基础,结合野外调查,沿管线得到40个灾害点。获取坡度、来水量、地表抗冲性、渗透性、植被等7个指标因子,用层次分析法确定各因子权重,发现坡度所占权重最高,达35.1%。借助Arc GIS软件,建立数据库,方便属性查询。通过加权叠加,将最终栅格图层按自然断点法进行分级,分为五级,得到调查点侵蚀强度等级图。比较分析结果与实际管线调查情况较吻合,表明该方法在坡面侵蚀研究中值得推广,从而为油气管道运营期主要治理区域及新管线的选线提供一定的理论支持。 Erosion caused by sloping surface is one of the important types in pipeline disasters passing alluvial fan. Based on the interpretation of remote sensing images and the field investigation,established slope model of erosion monomer and obtained 40 points along pipeline of alluvial fan which lies in the north of Xili channel in Wulan county of Qinghai Province. Extracted seven factors such as slope,water yield,anti-scouribility,permeability,vegetation coverage and so on,using AHP to determine the weight of each factor,find slope has the highest weight of all,up to 35. 1%. Establish a database of alluvial fan in order to query attribute by GIS.The final grid layer is divided into five levels,and the erosion intensity grade map is obtained by weighted stack. Comparing analysis results and actual pipeline investigation,find which have a good consistency. The resaults show it is worth popularizing in the study of slope erosion. So as to provide some theoretical support for the main government area of existing pipeline and line selection of new pipeline.
出处 《中国地质灾害与防治学报》 CSCD 2018年第1期119-124,共6页 The Chinese Journal of Geological Hazard and Control
基金 中国石油天然气股份有限公司西部管道分公司科技开发项目(XG-2015-001)
关键词 GIS 坡面侵蚀 冲积扇 指标因子 加权叠加 GIS slope erosion alluvial fan index factors weighted-overlay
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