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Severe flooding along the eastern Adriatic coast: the case of 1 December 2008

机译：亚得里亚海东部沿海严重洪灾：2008年12月1日

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摘要

This paper addresses an extraordinary storm surge in the Northern Adriatic that was more pronounced on the eastern than on the western shore. On 1 December 2008, Adriatic monitoring stations detected exceptionally high sea levels; the oldest Croatian tide gauge station recorded the highest water level in its operating history at the time. Apart from the Northern Adriatic, large portion of the Dalmatian Coast was also exposed to high water levels, while Venice experienced a less-dramatic event. This marine storm was different from the capital storm of 4 November 1966 during which the surge had the highest impact ahead of Venice and along the north-western coastline. The 2008 event is studied here in detail, and the mechanisms that resulted in the different flooding of the two shores are identified. The study is based on hourly sea level, air pressure and wind data measured along both basin sides together with ECMWF reanalysis fields. Four components of sea-level evolution are identified: the storm surge, tide, Adriatic seiche and, low-frequency variability. The 2008 event was the outcome of a fine interplay between the first three components, which were all superimposed on the raised sea level due to low-frequency variability. The marine storm differed from the 1966 storm in the atmospheric forcing and relative timing of all contributing processes. The 2008 flooding of the eastern coast was mainly due to the Sirocco-wind shear, whereas the 1966 flooding of the western coast was due to the combined effect of almost uniform Sirocco and bottom slope.
机译：本文针对的是北亚得里亚海的一次异常风暴潮，其东部地区比西部地区更为明显。 2008年12月1日，亚得里亚海监测站检测到异常高的海平面；克罗地亚最古老的潮汐仪站当时的运行历史记录为最高水位。除了北亚得里亚海以外，达尔马提亚海岸的大部分地区还处于高水位，而威尼斯则经历了较少的剧烈活动。这次海洋风暴与1966年11月4日的首都风暴不同，在这次首都风暴中，风暴潮对威尼斯及西北海岸线的影响最大。这里将详细研究2008年的事件，并确定导致两岸水灾程度不同的机制。该研究基于沿盆地两侧测量的每小时海平面，气压和风数据以及ECMWF再分析场。确定了海平面演变的四个组成部分：风暴潮，潮汐，亚得里亚海seiche和低频变化。 2008年的事件是前三个组成部分之间良好相互作用的结果，由于低频变化，所有三个组成部分都叠加在升高的海平面上。海洋风暴与1966年的风暴在大气强迫和所有促成过程的相对时机上有所不同。 2008年东海岸的洪水主要是由于西洛克风切变，而1966年西海岸的洪水是由于西洛克和底坡几乎均匀的综合作用。

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