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首页> 外文期刊>Ocean & coastal management >Coastal hazards from slope mass movements: Analysis and management approach on the Barlavento Coast, Algarve, Portugal
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Coastal hazards from slope mass movements: Analysis and management approach on the Barlavento Coast, Algarve, Portugal

机译：斜坡运动引起的海岸危险：葡萄牙阿尔加威的Barlavento海岸的分析和管理方法

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摘要

The Barlavento Coast, Algarve, Portugal, is dominated by rocky sea-cliffs, cut on Miocene calcarenites which evolves through intermittent and discontinuous events of slope mass movements, along a 46 km cliff front. Here, the main coastal geologic hazards result from the conflict between human occupation and sea-cliff recession. Most of the research on the dynamics of the cliffs has been directed to the risk with the aim of defining long term set-back lines, for a preventive planning of the cliff top occupation. Little attention has been given to the hazard associated with mass movements on bathing beaches backed by sea-cliffs. This article presents the results of a field inventory of 244 slope mass movements single events, collected in a rocky shore with tens of touristic pocket beaches, covering an nineteen year time span (1995-2014). Results show that landslides have seasonal pattern with higher incidence in the period between winter and early spring. More than 15% of movements occur during the Easter holidays (April) and 4% of landslides occur during the official bathing season (June-September). The spatial distribution of landslides shows that only 22% of the mass movements occur in capes and headlands, while 78% occur on the beaches, which demonstrates that the beaches are real hot spots of risk. Based on the size distribution of slope mass movements runout ratio (the ratio between the radius of the base of the cone of and the height of the movement) a table of levels of security and hazard on beaches was built. Security levels enable the definition of cartographic hazard areas on beaches which can be provided to the beach users on information boards at the beach entrance.
机译：葡萄牙阿尔加威的Barlavento海岸以岩石中的海崖为主，中新世的卡卡利尼特山脉上切有岩石，沿46公里的悬崖前缘间歇性和不连续的斜坡运动不断发展。这里，主要的沿海地质灾害是由于人类占领和海崖衰退之间的冲突造成的。绝大部分关于悬崖动力的研究都是针对这种风险的，目的是确定长期的退避线，以预防性规划悬崖顶部的占领。很少有人关注与海崖相连的泳滩上群众运动带来的危害。本文介绍了在一个岩石海岸上收集的244个斜坡质量运动单个事件的现场调查结果，这些岩石海岸有数十个旅游口袋海滩，涵盖了19年的时间跨度（1995年至2014年）。结果表明，滑坡具有季节性特征，在冬季至早春期间发生率较高。超过15％的运动发生在复活节假期（4月），而4％的滑坡发生在正式的沐浴季节（6月至9月）。滑坡的空间分布表明，只有22％的群众运动发生在海角和岬角，而78％的发生在海滩上，这表明海滩是真正的危险热点。根据边坡质量运动跳动率的大小分布（锥底半径与运动高度之比），建立了海滩安全和危害等级表。安全级别可以定义海滩上的制图危险区域，可以在海滩入口处的信息板上将其提供给海滩使用者。

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