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原文传递 FLOATING WAVE ATTENUATOR : A CHALLENGING CASE STUDY ON THE MAGGIORE LAKE , ITALY

题名：	FLOATING WAVE ATTENUATOR : A CHALLENGING CASE STUDY ON THE MAGGIORE LAKE , ITALY
作者：	Sara LANZONI
关键词：	FLOATING WAVE ATTENUATOR; MAGGIORE LAKE , ITALY
摘要：	In September 1999 Sistema Walcon has decided to accept the challenge - to study the mooring system of a floating breakwater in Verbania, Lago Maggiore , Italy. The Lakes of North Italy are very particular from their geological configuration as they are part of the Alpine system, generated during the Tertiary. As you may know, under their water surfaces, the landscape is very similar to the surroundings one: the taller mountains are and deeper is the lake, the slope remaining usually the same. The main issue for the Maggiore Lake was the mooring system in deep waters and where the ground was in rock with a steep slope. Another issue was the correct dimensioning of the breakwater modules considering the climate conditions of the lake and the related mooring forces taking place. A team of our engineers sorted out a bright idea based on flexible mooring system. To evaluate the feasibility, Sistema Walcon carried out some physical experiments in an artificial basin to better define the behaviour of the whole configuration. The tests on the breakwater done on scaled model have been very useful to learn the entity of the forces playing a major role on the overall system: waves attenuator modules and the long, flexible mooring lines. After months of experiments we were able to establish with a good precision: the forces along the mooring lines, the forces in the stainless steel cables used for the joints between the modules and the wave attenuation capacity. Only a few figures to give you an idea of the size of the project: 15 breakwaters units 75-Ton weight, 62 mooring lines settled from -0,50m to -65/100 m, 62 10-Ton weight concrete anchors left at 65-100 m depth and at 500 m from the coast, thousands meters of high tenacity rope, 5-strand seaflex 4 meters long, 1.400 m of stainless steel cable. The whole work took 7 months - from June 2000 to January 2001. During this period of time, we had also to suffer of very bad climatic condition during the course of October/November, where as the heavy rains increased the level of the lake above any historical data. Nevertheless everything has been done. Since last January, the floating structures have been working well. Given the very particular circumstances, it is really important to have a regular maintenance plan in order to control the conditions of each element. This installation is like “machine”: the overall functionality relies on the smooth running of the single components.
总页数：	Proceedings of the 30th PIANC-AIPCN Congress. Sydney Australia. 22-26 Sept. 2002. pp12
报告类型：	科技报告