Landslide volumes and landslide mobilization rates in Umbria, central Italy
Landslide volumes and landslide mobilization rates in Umbria, central Italy
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DOI：
10.1016/j.epsl.2009.01.005
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发表时间：
2009-03-30
影响因子：
5.3
通讯作者：
Valigi, Daniela
中科院分区：
文献类型：
--
作者：
Guzzetti, Fausto;Ardizzone, Francesca;Valigi, Daniela
从一个包含单个滑坡几何测量数据的全球数据库中选取了677个滑动型滑坡的目录，其中包括滑坡面积（\(A(L)\)）和体积（\(V - L\)）。这些测量数据被用于建立一个经验关系式，将\(A(L)\)（单位：平方米）与\(V - L\)（单位：立方米）联系起来。该关系式呈幂律形式，标度指数\(\alpha = 1.450\)，涵盖了\(A(L)\)的八个数量级和\(V - L\)的十二个数量级，并且与文献中已发表的现有关系式大体一致。经验数据在相关线周围的离散度降低，以及所考虑的滑坡发生在多种地形和气候环境中且由不同触发因素导致这一事实，表明\(V - L\)和\(A(L)\)之间的关系在很大程度上与地形环境无关。
利用该新关系式确定了意大利中部科拉佐内地区滑动型单个滑坡的体积，该地区面积为78.9平方千米，拥有一份涵盖1937年至2005年这69年期间的多时相滑坡清单。在观测期内，滑坡物质的总体积为\(V - LT = 4.78×10^{7}\)立方米，对应的滑坡活动平均速率\(\varphi(L)= 8.8\)毫米/年。利用滑坡清单中的时间信息，区分出了新滑坡和重新活动的滑坡在不同时期产生的物质体积。1937年至1941年的湿润期被确认为滑坡加速产生的阶段。在这5年期间，科拉佐内地区所记录的滑坡物质总量中约45%是在此期间产生的，对应的滑坡活动平均速率\(\varphi(L)= 54\)毫米/年，是长期速率的6倍。
将一次事件或一个时期内的滑坡物质体积用作该事件或时期规模的替代指标，其定义为该事件或时期内产生的滑坡总体积的以10为底的对数。从这个角度来看，将\(A(L)\)和\(V - L\)联系起来的新关系式是为滑坡事件采用基于过程的定量滑坡规模等级的一个起点。（C）2009爱思唯尔有限公司。保留所有权利。
A catalogue of 677 landslides of the slide type was selected from a global database of geometrical measurements of individual landslides, including landslide area (A(L)) and volume (V-L). The measurements were used to establish an empirical relationship to link A(L) (in m(2)) to V-L (in m(3)). The relationship takes the form of a power law with a scaling exponent alpha=1.450, covers eight orders of magnitude ofAL and twelve orders of magnitude of V-L, and is in general agreement with existing relationships published in the literature. The reduced scatter of the experiential data around the dependency line, and the fact that the considered landslides occurred in multiple physiographic and climatic environments and were caused by different triggers, indicate that the relationship between V-L and A(L) is largely independent of the physiographical setting. The new relationship was used to determine the volume of individual landslides of the slide type in the Collazzone area, central Italy, a 78.9 km(2) area for which a multi-temporal landslide inventory covering the 69-year period from 1937 to 2005 is available. In the observation period, the total volume of landslide material was V-LT=4.78x10(7) m(3), corresponding to an average rate of landslide mobilization phi(L)= 8.8 mm, yr(-1). Exploiting the temporal information in the landslide inventory, the volume of material produced during different periods by new and reactivated landslides was singled out The wet period from 1937 to 1941 was recognized as an episode of accelerated landslide production. During this 5-year period, approximately 45% of the total landslide material inventoried in the Collazzone area was produced, corresponding to an average rate of landslide mobilization phi(L)= 54 mm yr(-1), six times higher than the long term rate. The volume of landslide material in an event or period was used as a proxy for the magnitude of the event or period, defined as the logarithm (base 10) of the total landslide volume produced during the event, or period. With this respect, the new relationship to link A(L) and V-L is a starting point for the adoption of a quantitative, process based landslide magnitude scale for landslide events. (C) 2009 Elsevier B.V. All rights reserved.