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首页> 外文期刊>Geosciences >Analysis of Costantino Landslide Dam Evolution (Southern Italy) by Means of Satellite Images, Aerial Photos, and Climate Data
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Analysis of Costantino Landslide Dam Evolution (Southern Italy) by Means of Satellite Images, Aerial Photos, and Climate Data

机译：通过卫星图像，航拍照片和气候数据分析科斯塔蒂诺滑坡大坝的演变（意大利南部）

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摘要

Large landslides, triggered by earthquakes or heavy rainfall, often obstruct the river’s flow to form landslide dams, causing upstream inundations, and downstream flooding. In Italy, landslide dams are rather widespread along in Alps and Apennines: although the identification of past events is a complex task, some hundreds of landslide dams are identified in the literature. In order to assess the formation and evolution of landslide dams, several studies suggested the employment of geomorphological indexes. In this framework, the knowledge of site-specific time-space evolution can be useful in the understanding of the landslide dams phenomena. The present work focuses on a landslide dam that occurred in January 1973, which totally dammed the Bonamico River Valley (Southern Italy): the lake reached an area of about 175,000 m 2 , a volume of about 3.6 × 10 6 m 3 and a maximum depth of 40 m. During 1973–2008, the lake surface gradually decreased and nowadays it is completely extinct by filling. By using satellite and aerial images, the paper discusses the evolution of the lake surface and the causes of the lake extinction. The use of a climate index (i.e., standardized precipitation index at different time scale) indicates that in recent decades the alternance of drought and heavy rainfall periods affected the inflow/outflow dynamics, the filling of lake due to the solid transport of the Bonamico River, and the failure of the landslide dam.
机译：由地震或强降雨引发的大型滑坡经常阻碍河流的流动，形成滑坡坝，导致上游洪水泛滥和下游洪水泛滥。在意大利，滑坡水坝在阿尔卑斯山和亚平宁山脉相当普遍：尽管识别过去的事件是一项复杂的任务，但文献中已经确定了数百个滑坡水坝。为了评估滑坡坝的形成和演化，一些研究建议采用地貌指标。在这种框架下，特定地点的时空演化知识对于理解滑坡水坝现象可能很有用。目前的工作集中在1973年1月发生的滑坡水坝上，该水坝完全淹没了Bonamico流域（意大利南部）：该湖面积约175,000 m 2，流量约3.6×10 6 m 3，最大深度40 m在1973年至2008年期间，湖面逐渐减少，如今，湖面逐渐被填满而灭绝。通过使用卫星和航空图像，本文讨论了湖泊表面的演变以及湖泊灭绝的原因。使用气候指数（即不同时间尺度上的标准化降水指数）表明，近几十年来干旱和强降雨时段的交替影响了流入/流出的动态，以及由于Bonamico河的固体运输而导致的湖泊充水，以及滑坡坝的破坏。

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