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Ecological risks of geological disasters and the patterns of the urban agglomeration in the Fujian Delta region
Ecological Indicators ( IF 6.9 ) Pub Date : 2021-02-18 , DOI: 10.1016/j.ecolind.2021.107475
Jinhuang Lin , Mingshui Lin , Wenhui Chen , An Zhang , Xinhua Qi , Haoran Hou

Geological disasters not only hinder the ecological security guarantee in urban agglomerations, but also pose serious threat to the life and property of residents in the areas. The study establishes a “hazard-vulnerability-exposure” three-dimensional ecological risk assessment model, adopts an information value model to assess hazard, use landscape indices to analyze vulnerability and nighttime light data to indicate population exposure, and then quantitatively assesses the watershed-scale ecological risks of geological disasters and their patterns. The results show that ecological risks of geological disasters are mainly medium risks, presenting the trend of weakening from southeastern coastal areas to northwestern inland areas. The ecological risks exist in eight patterns in combination of the three dimensions of hazard, vulnerability and exposure. The elevation of 600–800 m, slope of 5 ~ 15°, aspect as southwest, NDVI of 0.4–0.6, lithology of metamorphic rocks, land use type as farmland, multi-year average precipitation of >1600 mm, distance to river of less than 200 m and distance to fault of less than 1000 m are the combination of greater likelihood of inducing geological disasters. The study finds that ecological risks of geological disasters show the trend of high in the southeast and low in the northwest and are the highest under combination of the high vulnerability and high exposure pattern out of the eight patterns that are predominated by high population exposure. In addition, the study discovers the combination of greater likelihood of inducing geological disasters, and puts forward the prevention and control measures against geological disasters in the future.



中文翻译:

福建三角洲地区地质灾害的生态风险与城市群格局

地质灾害不仅阻碍了城市群的生态安全保障,而且严重威胁着该地区居民的生命财产安全。该研究建立了一个“危害-脆弱性-暴露”的三维生态风险评估模型,采用了一种信息价值模型来评估危害,使用景观指数来分析脆弱性,并利用夜间光数据来指示人口暴露,然后定量地评估分水岭。衡量地质灾害的生态风险及其模式。结果表明,地质灾害的生态风险以中等风险为主,呈现出从东南沿海向西北内陆地区减弱的趋势。生态风险是由三种风险构成的八种模式,脆弱性和风险。海拔600–800 m,坡度5〜15°,向西南方向,NDVI为0.4–0.6,变质岩岩性,土地利用类型为农田,多年平均降水量> 1600 mm,距河的距离小于200 m和到断层距离小于1000 m的组合更容易引发地质灾害。这 研究 发现 ,地质灾害的生态风险呈东南高,西北低的趋势,在高脆弱性和高暴露模式相结合的八种以高人口暴露为主的模式中,地质灾害的风险最高。此外,研究发现了诱发地质灾害可能性更大的组合,并提出了未来的地质灾害防治措施。

更新日期:2021-02-18
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