“Questi fenomeni sono straordinari e improvvisi e avvengono quando un terreno, su un pendio particolarmente ripido, si satura d’acqua. Questo, senza preavviso e senza segnali, può scendere a valle improvvisamente travolgendo tutto”, con queste parole Silvio Seno, ospite del radiogiornale delle 8.00, spiega la probabile dinamica di quanto avvenuto a Bombinasco.
“Terra e acqua scendono a valle in breve tempo ed è quasi impossibile mettersi in salvo”, sottolinea il direttore dell’Istituto scienze della terra della SUSPI, scuola univestiaria professionale della Svizzera italiana, stando al quale: “In questo caso il bosco non è riuscito a svolgere la sua funzione protettiva probabilmente a causa delle eccezionali precipitazioni e, come detto pendenza del terreno eccessiva; in queste frane il primo strato di terreno che solitamente cede e viene a valle”.
Dello stesso avviso pure il geologo cantonale, Giorgio Valenti, stando al quale, "la frana è stata causata da un effetto concomitante di più fattori a iniziare dall'acqua abbondante nel terreno"
RSI Info 06.11.2014, 12:17
“La carta dei rischi geologici in Ticino deve essere aggiornata periodicamente, soprattutto in Ticino, regione di montagna poiché il territorio evolve, aumentano i dati a disposizione degli esperti e migliorano anche le conoscenze dei fenomeni ,non solo atmosferici”, sottolinea Seno.
RG/bin
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