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Come già precedentemente illustrato, l’intervento oggetto del presente progetto è finalizzato al ripristino, alla bonifica ed alla fruizione del sito, ripristinando le condizioni di sicurezza ottimali per la tutela del territorio, delle attività di pesca e di balneazione che vengono praticate nello specchio d’acqua antistante, delle condizioni igieniche e dell’intero equilibrio dell’ecosistema.
Dal punto di vista naturalistico nel sito interessato, come riportato nelle carte del Piano di Gestione dell’area SIC, abbiamo le due seguenti tipologie:
1) BOSCAGLIE A JUNIPERUS
Aree ad estensione variabile a prevalenza di ginepro ( Juniperus oxicedru ssp macrocarpa ) e lentisco (Pistacia lentiscus) sul fronte dunale esposto ai forti venti. Fra le specie sporadica presenza di Daphne gnidium, Juniperus phoenicea ssp lycia, Asparagus stipularis (Pistacio - Juniperetum macrocarpae).
2) MACCHIA MEDITERRANEA
Aree ad estensione limitata a prevalenza di specie arbustive della macchia termofila a prevalenza di lentisco ( Pistacia lentiscus) ed associata alle specie specie alonitrofile dello stagno.
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L’intervento prevede di intervenire nel tratto attualmente utilizzato come campo boe e nell’area che fronteggia lo stesso, poiché, in tale tratto di littorale, appare necessario intervenire per garantire una protezione alle imbarcazioni, e la possibilità, per le stesse, di avvicinarsi e ormeggiare in sicurezza.
La valenza di frangi flutti dei pontili in progetto, inoltre, andrà a proteggere, lo stesso arenile, dall’azione meccanica delle onde che interessano l’arenile che, come verrà illustrato più avanti, sta subendo un sensibile arretramento.
L’intervento, pertanto, consentirà di ottenere un effetto protettivo che va a ridurre i fenomeni erosivi in essere.
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Lo studio geomorfologico, di seguito riportato, mostra l’evoluzione della linea di costa nel tempo.
In particolare, basandosi sulle immagini ortofotografiche dell’area, è stata ricostruita la linea di riva con riferimento agli anni: 1977, 2000, 2003, 2006, 2008.
L’analisi storica dell’evoluzione della linea di riva ha mostrato, un forte arretramento tra il periodo 1977 e 2000, mentre tra il 2000 e il 2008 la situazione sembra essersi stabilizzata. Chiaramente l’intervallo di tempo trascorso tra la prima foto (1977) e quella successiva analizzata (2000) risulta essere una variabile non trascurabile, tuttavia, in generale, la dinamica della costa oggetto di intervento mostra una particolare sensibilità rispetto alla capacità erosiva del moto ondoso, oltrechè,
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* Sabbie sopra e meso litorali con matte morte di posidonia oceanica
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Con riferimento all’opera in oggetto si evidenzia che i pontili, una volta ultimati i lavori di realizzazione e ripristino, saranno poco visibili, visto il loro profilo visibile nelle simulazioni dell’intervento.
Dall’analisi della figura di seguito riportata, si rileva l’assenza di beni culturali, archeologici ed architettonici nelle aree prossime all'area interessata dal progetto. Sulla base delle informazioni disponibili, si può escludere qualsiasi impatto nei confronti della presenza di segni dell’evoluzione storica del territorio dovuta all’intervento.
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In ottemperanza a quanto previsto nell’allegato alla D.G.R. n. 27/7 del 13.5.2008, della Regione Sardegna, al fine di mantenere fruibili le opere previste in progetto, con particolare riferimento allo scivolo a mare e l’accesso ai pontili, si prevede lo spostamento degli accumuli, localizzati nelle sole “corsie di accesso” alle opere in progetto, riposizionando, le sole posidonie ivi spiaggiate, nelle aree immediatamente circostanti, secondo una ridistribuzione omogenea e contestualizzata (spessore e dispersione).
Gli interventi sulla posidonia verranno preceduti dall’asportazione di tutti i rifiuti dagli arenili. Questa verrà effettuata con attrezzi manuali e potrà essere affiancata da mezzi meccanici dotati di un sistema di trigliaggio (griglie che consentono l’asportazione del rifiuto e il contestuale rilascio della sabbia e dei residui di posidonia). Eventuali rifiuti di piccole dimensioni, potranno essere asportati tramite l’utilizzo di setacci.
Il successivo spostamento o rimozione della posidonia spiaggiata dovrà essere effettuato con attrezzi manuali quali rastrelli per il prelievo selettivo delle foglie; per l’operazione specifica potranno essere affiancati mezzi meccanici leggeri a bassa invasività.
Per le suddette operazioni verrà preferito l’uso di attrezzi manuali e, per arenili molto estesi, l’uso di mezzi gommati “alleggeriti” con carro allargato, di peso non superiore alle 2,5 tonnellate, con pneumatici larghi e con profondità dei tasselli degli stessi max 5 cm. Si esclude l’utilizzo di mezzi cingolati.
La rimozione della posidonia nei siti soggetti a spiaggiamento consistente dovrà essere programmata ed eseguita periodicamente, con un minimo di tre interventi all’anno, rimuovendo solo gli strati più superficiali di foglie asciutte e lasciando quelle bagnate in loco per una rimozione successiva. In caso di eventi eccezionali quali mareggiate di notevole intensità che impediscano l’accesso al molo in progetto, è prevista la possibilità di un intervento straordinario.
La profondità dell’intervento di rimozione sarà limitata ai primi 10 cm. La posidonia, una volta eliminati tutti gli eventuali rifiuti, potrà essere accumulata nelle aree immediatamente circostanti. Le quantità di accumulo dovranno essere tali da non consentire fenomeni di putrefazione. Si esclude lo spandimento ove sia presente vegetazione pioniera, il piede delle dune mobili ed embrionali, anche di neoformazione potenziale e le dune fisse. In nessun caso è previsto di spostare, accumulare e ridistribuire la posidonia in spiagge differenti da quelle di prelievo in quanto tale fattispecie si configura come smaltimento e dunque soggetto alla normativa vigente in materia di rifiuti.
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Il progettista
Ing. Michele Fanelli
Collaboratori
Dott. Geol. Marco Manca
