基于GIS的海洋风电场地质灾害危险性评估研究

Geohazard assessment for offshore wind farm based on GIS

GIS技术已在工程地质灾害评价中得到了广泛应用,但在海洋风电场的工程地质灾害评价中应用较少,以某一海上风电场为例,采用地理信息技术,基于水深、地震、断层、浅层气等公开资料构建了风电场的地质灾害风险评估模型,基于该模型对浅层气、滑坡、地震、断层及冲刷等典型地质灾害进行了分析,可以得出场址区可能存在浅层气,同时结合地震及工程地质条件分析,场址区存在砂土液化的可能性,这些地质灾害均会对风机的安装运行造成影响。相关分析可为后期的场址规划和详勘提供技术支持。

GIS has been widely applied in the evaluation of geohazards onshore,but it is rarely applied in offshore wind farms.Taking an offshore wind farm as an example,this paper applies GIS technology in the evaluation of geohazards in the planning stage of offshore wind farms.The paper constructs a geohazard risk assessment model of the wind farm based on public data such as water depth,earthquakes,faults,and shallow gas.Based on the model,it analyzes the typical geohazards such as shallow gas,landslides,earthquakes,faults,and scouring.It can be seen that shallow gas may exist in the site area,and the possibility of sand liquefaction can be analyzed in combination with the seismic and engineering geological conditions.All of these will influence the installation and operation of the wind turbine.The correlation analysis can provide technical support for later site planning and detailed investigation.