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Lago Maggiore
Problemi
Regolazione
Obiettivi
Problemi
• I problemi che si riscontrano sul Verbano
derivano da:
• Un rapporto di 1 a 30 tra la superficie del
bacino lacustre (212 kmq) e quella del
bacino idrografico (6562 kmq).
– 100 mm. di pioggia comportano un
innalzamento del livello di m. 1.0 – 1,50
• Un‘occupazione molto spinta delle rive
Regolazione
• Il lago è regolato in base al Disciplinare
firmato tra Italia e Svizzera nel 1938 ed
entrato in vigore, con l‘atto di concessione,
il 24 gennaio 1940
Modalità di regolazione
Periodo Livello minimo Livello
massimo
1/1 – 1/3 -0.50 +1.50
15/3 – 15/11 -0.50 +1.00
1/12 – 31/12 -0.50 +1.50
Effetti della regolazione
Costo delle inondazioni
• La curva comprende
sia i danni alle
strutture che ai
contenuti in Italia ed
in Svizzera
Obiettivi
• Minimizzare i danni delle esondazioni attraverso:
– Sistema di allarme
– Difese puntiformi
– Aumento del deflusso all‘incile (riduzione livello .50
m.)
• Massimizzare i benefici dell‘invaso per gli utenti
irrigui ed idroelettrici di valle mediante:
– Revisione disciplinare
Vincoli
• Garantire la regolazione durante la
costruzione
• escludere la responsabilità del Consorzio
in caso di danni
• non recare danni a Pavia
• Non danneggiare gli argini a valle della
Miorina
Soluzione concettuale
• Dragaggio
• Limitazione del deflusso massimo
• Rifacimento parziale dello sbarramento
con realizzazione di un sistema di
limitazione automatica dei massimi
Aumento del deflusso (500 mc)
• Scarifica del Ticino
– Stabilità delle sponde
– Costi (scarifica e rafforzamento argini)
• Modifica sbarramento
– Stato attuale
– Adeguamento struttura di regolazione
– costi
Aumento del deflusso (600 mc)
• Verifica degli argini tra Miorina e Pavia
– Eventuali rafforzamenti
– Costi
Nuovo disciplinare (+1.50 annuo)
• Verifica effetti sulle piene storiche
• Anticipo apertura (24 – 48 h) in base alle
previsioni meteorologiche
– Determinazione del margine di errore
– Valutazione dei costi conseguenti
Inondazioni a valle
• Non aumentare il rischio attuale
– chiusura paratoie a 2100 mc/s per tornare
sulla curva naturale
• Evitare l‘incontro delle onde di piena di Po
e Ticino
– Determinare velocità onda di piena Ticino
– Verificare le conseguenze sui rivieraschi di
una ritensione temporanea del‘acqua

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Verbano 2002 regolazione

  • 2. Problemi • I problemi che si riscontrano sul Verbano derivano da: • Un rapporto di 1 a 30 tra la superficie del bacino lacustre (212 kmq) e quella del bacino idrografico (6562 kmq). – 100 mm. di pioggia comportano un innalzamento del livello di m. 1.0 – 1,50 • Un‘occupazione molto spinta delle rive
  • 3. Regolazione • Il lago è regolato in base al Disciplinare firmato tra Italia e Svizzera nel 1938 ed entrato in vigore, con l‘atto di concessione, il 24 gennaio 1940
  • 4. Modalità di regolazione Periodo Livello minimo Livello massimo 1/1 – 1/3 -0.50 +1.50 15/3 – 15/11 -0.50 +1.00 1/12 – 31/12 -0.50 +1.50
  • 6. Costo delle inondazioni • La curva comprende sia i danni alle strutture che ai contenuti in Italia ed in Svizzera
  • 7. Obiettivi • Minimizzare i danni delle esondazioni attraverso: – Sistema di allarme – Difese puntiformi – Aumento del deflusso all‘incile (riduzione livello .50 m.) • Massimizzare i benefici dell‘invaso per gli utenti irrigui ed idroelettrici di valle mediante: – Revisione disciplinare
  • 8. Vincoli • Garantire la regolazione durante la costruzione • escludere la responsabilità del Consorzio in caso di danni • non recare danni a Pavia • Non danneggiare gli argini a valle della Miorina
  • 9. Soluzione concettuale • Dragaggio • Limitazione del deflusso massimo • Rifacimento parziale dello sbarramento con realizzazione di un sistema di limitazione automatica dei massimi
  • 10. Aumento del deflusso (500 mc) • Scarifica del Ticino – Stabilità delle sponde – Costi (scarifica e rafforzamento argini) • Modifica sbarramento – Stato attuale – Adeguamento struttura di regolazione – costi
  • 11. Aumento del deflusso (600 mc) • Verifica degli argini tra Miorina e Pavia – Eventuali rafforzamenti – Costi
  • 12. Nuovo disciplinare (+1.50 annuo) • Verifica effetti sulle piene storiche • Anticipo apertura (24 – 48 h) in base alle previsioni meteorologiche – Determinazione del margine di errore – Valutazione dei costi conseguenti
  • 13. Inondazioni a valle • Non aumentare il rischio attuale – chiusura paratoie a 2100 mc/s per tornare sulla curva naturale • Evitare l‘incontro delle onde di piena di Po e Ticino – Determinare velocità onda di piena Ticino – Verificare le conseguenze sui rivieraschi di una ritensione temporanea del‘acqua