《Journal of Hydrologic Engineering 》杂志刊登“意大利台伯河Montedoglio坝溢洪道溃决的数据收集和事故分析”

作  者：Tommaso Moramarco, Silvia Barbetta, Claudia Pandolfo, Angelica Tarpanelli, Nicola Berni, Renato Morbidelli

刊  物：《Journal of Hydrologic Engineering》，2013年8月5日印刷

关键词：Montedoglio坝，溢洪道溃决，数据收集，模拟

摘  要：为了满足工业、电力、农业和饮水需求，上世纪前十年意大利修了很多大坝。Montedoglio坝是其中较重要的一个水库，其位于意大利中部的台伯河上，流域面积276平方公里，最大库容约为153万立方米。坝体是带有两个水闸并在一定程度上控制溢洪道的土石坝，2010年12月29日，由于溢洪道的一部分突然坍塌，巨大的水量淹没大坝下面的山谷，给下游造成了巨大损失，但幸好没有伤亡。鉴于该大坝及其溃坝事件特殊性，本文拟对收集到的水库水位以及在下游及被淹没区观测到的流量过程数据进行分析，并模拟溃决水流的破坏演化及其在下游的传播情况。利用纳什纳什萨克利夫性能指标模拟水库水位，并通过优化处理过程得到了破坏演化试验和相应的流量系数，其分别为0.02h和0.15。最后，基于一维水力模型得到了下游主干道和河漫滩地区的曼宁糙率系数，此模型同时也考虑了河谷不同的洪水情况。

The spillway collapse of the Montedoglio dam on the Tiber River (central Italy): data collection and event analysis

Authors: Tommaso Moramarco, Silvia Barbetta, Claudia Pandolfo, Angelica Tarpanelli, Nicola Berni, Renato Morbidelli

Journal: Journal of Hydrologic Engineering , Published: 05 August 2013

Key words: Montedoglio dam, spillway collapse, data collection, simulation

Abstract: A large number of dams were built in Italy in the first decades of the last century to supply the need of industrial, electric power, agricultural and drinking purposes. Among them, the Montedoglio dam, an important reservoir on the Tiber River located in central Italy, with a drainage area of 276 km2 and a maximum storage volume of about 153 Mm3. The dam is an earth-fill structure with overfall spillway partly controlled by two sluice gates. On 29th December, 2010 due to the partial sudden collapse of the spillway a huge water volume flooded the valley below the dam with high damage for the territory and population, luckily without causalities. Considering that scarce data are available for this type of events worldwide, this paper aims, on the one hand, to illustrate the collected data of the event in terms of reservoir levels, discharge hydrograph observed at downstream gauged river sites and flooded valley area, on the other hand, to simulate the breach evolution and the downstream propagation of the outflow. Considering the Nash-Sutcliffe performance measure in simulation of the recorded reservoir levels, the time of breach formation and the corresponding discharge coefficient are obtained through an optimization procedure and values of 0.02 h and 0.15 are found, respectively. Finally, the Manning's roughness coefficients for the downstream main channel and the floodplain areas are detected through a methodology based on one-dimensional hydraulic modelling by considering different flooding scenarios of valley.