Tutela ambientale del Lago Trasimeno - ARPA Umbria

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6 . S i n t e s i e d a t i 18 Priorità e obiettivi ecologici per il recupero sostenibile del lago Trasimeno Priorities and ecological objectives for a sustainable restoration of the Lake Trasimeno 2 7 9 Angiolo Martinelli 18.1 Stato e criticità Il Trasimeno è un esteso lago laminare dell’Italia centrale praticamente endoreico, con un bacino naturale poco maggiore del doppio dell’estensione dello specchi d’acqua (284 contro 124 km 2 ) e profondità media rispetto alla soglia artificiale attuale di circa 4,5 metri. Fin dall’antichità è stato soggetto alle oscillazioni climatiche, alternando inondazioni delle coste a periodiche critiche riduzioni della sua profondità, conseguenza dell’estrema variabilità del clima mediterraneo. In epoca romana ci fu un primo tentativo di limitare le esondazione del lago con un emissario artificiale, senza risultati. Nello stesso periodo si formò una barra costiera sabbiosa, attualmente localizzata a oltre 1 km dalla riva nel settore sud-ovest del lago (indagini geofisiche da studi geologici regionali). Una fascia umida più o meno ampia, a carattere transizionale, caratterizzata ora quasi solamente da un ridotto canneto, si estendeva attorno al lago su tutta l’ampiezza interessata dalle oscillazioni di livello del lago e di convergenza delle acque di ruscellamento. 18.1 Status and criticity Lake Trasimeno is a large shallow lake in central Italy, and is practically endoreic. Its natural basin is little more than double the surface area of its water (284 km 2 and 124 km 2 respectively, and its mean depth with respect to the current artificial level is about 4.5m). Due to the extreme variability of the Mediterranean climate, it has since ancient times always been affected by climatic variations, going from periods when it floods its banks, and periods when it becomes much shallower. In Roman times there was a first attempt to limit flooding with an artificial outlet, but it was not successful. In the same period a coastal bar of sand formed, currently located at over 1 km from the bank in the south-west part of the lake (data from regional geophysical investigations). A swampy transition band of varying width, nowadays simply a small reed bank, surrounded the lake covering the whole area affected by the variations in water level and the convergence of runoff waters.
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Libri/Arpa Umbria
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Tutela ambientale del lago Trasimen
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Finito di stampare nel maggio 2012
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Tutela ambientale del Lago Trasimeno - ARPA Umbria

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