The seabed stability zonation based on the marine geohazards evaluation in China
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摘要: 通过对我国近海灾害地质类型的分析、评价进而进行海底稳定性区划研究，旨在反映近海地质环境对人类工程活动的适宜程度。文中提出了海底稳定性评价的概念，构建了以地震动、工程地质、地貌、直接型灾害地质类型和限制型灾害地质类型为主要评价指标的海底稳定性评价指标体系，并利用层次分析法确定了各评价指标权重值；将我国近海海底划分为6’×6’的网格单元，并以近海海底灾害地质图、地震动峰值加速度区划图和地貌图等矢量化图层为数据源，建立了模糊评价模型并对近海海底稳定性进行了定量评价。在此基础上将我国近海海底区域稳定性从稳定到不稳定划分为五级。Abstract: This paper analyzes and evaluates the seabed stability based on the marine geohazards in order to reflect the appropriate level of the geological environment of China's offshore to the human engineering activities. This paper proposes the concept of the evaluation of the seabed stability, and the indicator system of the evaluation of the seabed stability is set based on the earthquake zonation, engineering geology zonation, topography zonation, direct geohazards and restricted geohazards. And the weighted value of all evaluation indicators has been determined by using analytic hierarchy process. The seabed of China's offshore is divided into 6'×6' grid cells and the evaluation result is calculated by the map layer data of the marine geohazards map, earthquake zonation map, topography map and other digital layers with fuzzy comprehensive evaluation method. The seabed stability of China's offshore is divided into five grades from stable status to unstable status.
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Key words:
- marine /
- geohazards /
- evaluation /
- zonation /
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