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53 FISH 4500/4600 Manuale per l’installazione e l’uso
NAVMAN
Fondale
Grande
banco di
pesci
Intensità degli echi
I colori indicano le differenti intensità degli echi.
L’intensità varia in base a molti fattori, come:
La dimensione del pesce, del banco di pesci
o di altri oggetti.
La profondità a cui si trova il pesce o
l’oggetto.
La posizione del pesce o dell’oggetto.
(L’area coperta dall’impulso ultrasonico ha
una grossolana forma di cono e l’intensità
degli echi è maggiore nella zona mediana).
La trasparenza dell’acqua. Le particelle
d’aria nell’acqua riducono l’intensità
dell’eco.
La composizione o la densità dell’oggetto o
del fondale.
Nota: Le carene plananti in velocità produ-
cono bolle d’aria ed acqua turbolenta che
colpisce violentemente il trasduttore. Le
interferenze ultrasoniche che ne derivano
possono essere rilevate dal trasduttore ed
oscurare gli echi veri.
Singolo
pesce
Alghe
I fondali duri,
come nel caso
di rocce e cor-
alli, compaiono
come strisce
larghe
I fondali soffici,
come quelli
fangosi, cop-
erti da alghe e
sabbia, sono
visualizzati
come strisce
strette
Tipi di fondali
I fondali fangosi, con alghe e sabbiosi tendono
ad indebolire e disperdere l’impulso sonar, il che
produce un’eco debole. I fondali duri, rocciosi
e con coralli, riflettono l’impulso producendo
un’eco forte. Vedere la sezione 5-3 Schermata
Fondale Sonar.
Piccolo
banco di
pesci
16


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