{"id":49660,"date":"2019-12-05T00:16:15","date_gmt":"2019-12-04T23:16:15","guid":{"rendered":"http:\/\/www.ocean4future.org\/savetheocean\/?p=49660"},"modified":"2026-03-16T09:17:51","modified_gmt":"2026-03-16T08:17:51","slug":"come-le-onde-acustiche-ci-possono-aiutare-a-scoprire-i-misteri-dei-fondali-del-mare-parte-ii-di-andrea-mucedola","status":"publish","type":"post","link":"https:\/\/www.ocean4future.org\/savetheocean\/archives\/49660","title":{"rendered":"I Sub Bottom Profiler e molti altri: il futuro della ricerca &#8211; parte III"},"content":{"rendered":"<span class=\"span-reading-time rt-reading-time\" style=\"display: block;\"><span class=\"rt-label rt-prefix\">tempo di lettura: <\/span> <span class=\"rt-time\"> 4<\/span> <span class=\"rt-label rt-postfix\">minuti<\/span><\/span><p><span style=\"color: #ffffff;\">.<\/span><br \/>\n<a class=\"maxbutton-4 maxbutton maxbutton-livello-di-comprensione\" href=\"javascript:void(0);\"><span class='mb-text'>livello elementare<\/span><\/a><br \/>\n<span style=\"color: #ffffff;\">.<\/span><br \/>\n<strong><span style=\"color: #008000;\">ARGOMENTO: OCEANOGRAFIA<\/span><\/strong><br \/>\n<strong><span style=\"color: #008000;\">PERIODO: XX-XXI SECOLO<\/span><\/strong><br \/>\n<strong><span style=\"color: #008000;\">AREA: DIDATTICA<\/span><\/strong><br \/>\nparole chiave: Sonar, multibeam, sub bottom profiler<\/p>\n<p style=\"text-align: justify;\">&nbsp;<\/p>\n<p style=\"text-align: justify;\"><span style=\"font-size: 18pt;\"><strong><span style=\"color: #008000;\">Dopo aver visto i sistemi acustici single e multibeam affrontiamo ora altre tipologie che trovano molti impieghi nel campo scientifico e civile<\/span><\/strong><\/span><\/p>\n<p style=\"text-align: justify;\"><span style=\"font-size: 18pt;\"><strong><span style=\"color: #008000;\">Sub-bottom profiler<\/span><\/strong><\/span><br \/>\nAltri sistemi impiegati nella ricerca oceanografica e geologica (soprattutto nell\u2019off-shore) sono i <strong><span style=\"color: #008000;\">sub-bottom profiler,<\/span><\/strong> sistemi che vengono utilizzati per raccogliere i profili di riflessione sismica degli strati di sedimenti sotto il fondo del mare.<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"wp-image-36066\" src=\"https:\/\/www.ocean4future.org\/savetheocean\/wp-content\/uploads\/2019\/11\/deep-sea-underwater-surveying-sub-profiler.jpg\" alt=\"\" width=\"850\" height=\"638\" srcset=\"https:\/\/www.ocean4future.org\/savetheocean\/wp-content\/uploads\/2019\/11\/deep-sea-underwater-surveying-sub-profiler.jpg 638w, https:\/\/www.ocean4future.org\/savetheocean\/wp-content\/uploads\/2019\/11\/deep-sea-underwater-surveying-sub-profiler-300x225.jpg 300w\" sizes=\"auto, (max-width: 850px) 100vw, 850px\" \/><\/p>\n<p align=\"justify\"><strong><span style=\"color: #008000;\">sub bottom profiler da Slideshare<\/span><\/strong><\/p>\n<p style=\"text-align: justify;\">Quando il segnale acustico raggiunge il fondo del mare, una parte dell&#8217;energia acustica penetra nel sedimento del fondale, riflettendosi solo quando incontra il limite fisico tra due strati di materiali che hanno densit\u00e0 diverse. Tecnicamente parlando il <strong><span style=\"color: #008000;\">sub bottom profiler<\/span><\/strong> rileva i cambiamenti dell&#8217;<strong><span style=\"color: #008000;\">impedenza acustica<\/span><\/strong>, relativi alle caratteristiche fisiche dei diversi sedimenti. Il sistema <strong><span style=\"color: #008000;\">Knudsen Chirp 3260, <\/span><\/strong>usato dal <strong><span style=\"color: #008000;\">NOOA<\/span><\/strong>, funziona a una frequenza di 3,5 kHz e pu\u00f2 rilevare il fondale marino fino a una profondit\u00e0 di 10.000 metri.<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-36068\" src=\"https:\/\/www.ocean4future.org\/savetheocean\/wp-content\/uploads\/2019\/11\/sub-bottom-profiler-images.png\" alt=\"\" width=\"1200\" height=\"960\" srcset=\"https:\/\/www.ocean4future.org\/savetheocean\/wp-content\/uploads\/2019\/11\/sub-bottom-profiler-images.png 1200w, https:\/\/www.ocean4future.org\/savetheocean\/wp-content\/uploads\/2019\/11\/sub-bottom-profiler-images-300x240.png 300w, https:\/\/www.ocean4future.org\/savetheocean\/wp-content\/uploads\/2019\/11\/sub-bottom-profiler-images-768x614.png 768w, https:\/\/www.ocean4future.org\/savetheocean\/wp-content\/uploads\/2019\/11\/sub-bottom-profiler-images-1024x819.png 1024w\" sizes=\"auto, (max-width: 1200px) 100vw, 1200px\" \/><\/p>\n<p style=\"text-align: justify;\"><span style=\"font-size: 18pt;\"><strong><span style=\"color: #008000;\">Ecoscandagli a fascio diviso<\/span><\/strong><\/span><br \/>\nSono sistemi sonar attivi ampiamente utilizzati per la ricerca nel settore della pesca. Essi utilizzano un singolo trasduttore, a fascio diviso, che emette dei ping ad una singola frequenza che pu\u00f2 variare tra i 18 e 710 kHz. La risposta acustica a frequenze diverse varia tra le specie pelagiche e ci\u00f2 fornisce la possibilit\u00e0 di identificare le diverse specie. Eseguendo, continuamente delle scansioni, variando le frequenze, si riesce a ridurre il rumore e a migliorare la definizione dei bersagli.<br \/>\n<span style=\"color: #ffffff;\">.<\/span><\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"wp-image-36069\" src=\"https:\/\/www.ocean4future.org\/savetheocean\/wp-content\/uploads\/2019\/11\/garmin-ecoscandaglio-gpsmap-8015-01.jpg\" alt=\"\" width=\"850\" height=\"638\" srcset=\"https:\/\/www.ocean4future.org\/savetheocean\/wp-content\/uploads\/2019\/11\/garmin-ecoscandaglio-gpsmap-8015-01.jpg 800w, https:\/\/www.ocean4future.org\/savetheocean\/wp-content\/uploads\/2019\/11\/garmin-ecoscandaglio-gpsmap-8015-01-300x225.jpg 300w, https:\/\/www.ocean4future.org\/savetheocean\/wp-content\/uploads\/2019\/11\/garmin-ecoscandaglio-gpsmap-8015-01-768x576.jpg 768w\" sizes=\"auto, (max-width: 850px) 100vw, 850px\" \/><\/p>\n<p align=\"justify\"><strong><span style=\"color: #008000;\">ricerca nel volume da <a href=\"https:\/\/culturamarinara.com\/come-scegliere-lecoscandaglio-recensione-prodotti\/\">come scegliere l&#8217;ecoscandaglio: CULTURA MARINARA<\/a><\/span><\/strong><\/p>\n<p style=\"text-align: justify;\">Questi sonar possono rilevare e identificare non solo i branchi di pesci ma anche agglomerati di plancton e la presenza delle sorgenti idrotermali, essendo in grado di rilevare anche l\u2019emissione di bolle nella colonna d&#8217;acqua. Questo \u00e8 particolarmente utile nell&#8217;off-shore per scoprire sorgenti di emissioni di metano.<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"wp-image-36070 size-full\" src=\"https:\/\/www.ocean4future.org\/savetheocean\/wp-content\/uploads\/2019\/11\/bolle-metano-e1573505297289.jpg\" alt=\"\" width=\"900\" height=\"380\"><\/p>\n<p align=\"justify\"><strong><span style=\"color: #008000;\">emissioni di metano dal fondo del mare rilevate dal sistema sonar &#8211; Brendan Philip \/University of Washington 2014 survey &#8211; more at&nbsp; &nbsp; <a href=\"https:\/\/agupubs.onlinelibrary.wiley.com\/doi\/full\/10.1029\/2018JB016453\">Anomalous Concentration of Methane Emissions at the Continental Shelf Edge of the Northern Cascadia Margin &#8211; Johnson &#8211; 2019 &#8211; Journal of Geophysical Research: Solid Earth &#8211; Wiley Online Library<\/a><\/span><\/strong><\/p>\n<p style=\"text-align: justify;\"><span style=\"font-size: 18pt;\"><strong><span style=\"color: #008000;\">Sonar profilatori a corrente acustica Doppler (ADCP)<\/span><\/strong><\/span><br \/>\nNon ultimi voglio accennare ai sistemi<b> <\/b><span style=\"color: #008000;\"><b>ADCP,<\/b> <\/span>utilizzati per misurare la velocit\u00e0 e direzione delle correnti oceaniche.&nbsp;Essi usano il principio dello &#8220;<strong><span style=\"color: #008000;\">spostamento Doppler<\/span><\/strong>&#8220;, un fenomeno fisico che consiste che consiste nel cambiamento apparente, rispetto al valore originario, della frequenza (o della lunghezza d&#8217;onda) <i>percepita<\/i>&nbsp;da un osservatore raggiunto da un&#8217;onda&nbsp;emessa da una sorgente che si trovi in movimento rispetto all&#8217;osservatore stesso.<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"wp-image-36072\" src=\"https:\/\/www.ocean4future.org\/savetheocean\/wp-content\/uploads\/2019\/11\/doppler-effect-gif-8.gif\" alt=\"\" width=\"800\" height=\"448\"><\/p>\n<p align=\"justify\"><strong><span style=\"color: #008000;\">effetto Doppler da animated.gif<\/span><\/strong><\/p>\n<p style=\"text-align: justify;\">Ricordate l\u2019esempio del treno? Quando viaggia verso di noi, il tono del fischio \u00e8 pi\u00f9 alto. Quando si allontana il tono diventa pi\u00f9 basso. Ma non solo \u2026 il cambio di intonazione \u00e8 proporzionale alla velocit\u00e0 del treno.<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"wp-image-36071\" style=\"color: #444444; display: inline; float: left; font-size: 16px; font-style: normal; font-variant: normal; font-weight: 400; height: 640px; letter-spacing: normal; line-height: 1.5; max-width: 640px; orphans: 2; text-align: justify; text-decoration: none; text-indent: 0px; text-transform: none; -webkit-text-stroke-width: 0px; white-space: normal; word-spacing: 0px; margin: 4px 24px 12px 0px;\" src=\"https:\/\/www.ocean4future.org\/savetheocean\/wp-content\/uploads\/2019\/11\/ADCP-bins-with-valid-Doppler-solutions-green-and-valid-three-or-four-beam-solutions_Q320.jpg\" alt=\"\" width=\"640\" height=\"320\"><\/p>\n<p align=\"justify\"><strong><span style=\"color: #008000;\">da Mudge, Todd &amp; Raye, R. &amp; Borg, Keath &amp; Milutinovic, Nikola &amp; Sadowy, Dawn &amp; Fissel, D.B. &amp; Ross, Ed. (2015). <em>Near sea ice, ocean current and turbulence measurements in the chukchi sea.<\/em> Proceedings of the International Conference on Port and Ocean Engineering under Arctic Conditions, POAC,&nbsp; 2015<\/span><\/strong><\/p>\n<p style=\"text-align: justify;\">Il principio di funzionamento dell&#8217;<strong><span style=\"color: #008000;\">ADCP<\/span><\/strong> \u00e8 molto semplice. Il sonar emette una serie di impulsi sonori ad alta frequenza che si disperdono nelle particelle in movimento nell&#8217;acqua. A seconda che le particelle si stiano muovendo verso o lontano dalla sorgente sonora, il tono del segnale di ritorno sar\u00e0 pi\u00f9 alto o pi\u00f9 basso. Questo ci fornir\u00e0 l\u2019informazione della direzione di spostamento. Lo spostamento della frequenza, essendo proporzionale alla velocit\u00e0 dell&#8217;acqua, ci d\u00e0 la sua velocit\u00e0. Semplice ma efficace. Il loro impiego consente di raccogliere i profili delle correnti oceaniche fino a 1000 metri sotto la superficie del mare.<\/p>\n<p style=\"text-align: justify;\"><strong><span style=\"color: #008000;\">La disponibilit\u00e0 di questi sistemi ha cambiato il modo di effettuare ricerche in mare dimostrandosi un valido aiuto per scoprirne i misteri. Ma la tecnologia avanza e il futuro ci riserver\u00e0 sicuramente delle sorprese.<\/span><\/strong><\/p>\n<p><strong><span style=\"color: #008000;\">Andrea Mucedola<\/span><\/strong><\/p>\n<p>&nbsp;<\/p>\n<p style=\"text-align: justify;\">in anteprima Jakobsson, Martin &amp; Gyllencreutz, Richard &amp; Mayer, Larry &amp; Dowdeswell, Julian &amp; Canals, Miquel &amp; Todd, Brian &amp; Dowdeswell, Evelyn &amp; Hogan, K.A. &amp; Larter, R.. (2016). Mapping submarine glacial landforms using acoustic methods. Geological Society, London, Memoirs. 46. 17-40. 10.1144\/M46.182.&nbsp;<\/p>\n<p><span style=\"color: #ffffff;\">.<\/span><\/p>\n<p style=\"text-align: justify;\">Alcune delle immagini possono essere state prese dal web, citandone ove possibile gli autori e\/o le fonti. Se qualcuno desiderasse specificarne l\u2019autore e le fonti o rimuoverle, pu\u00f2 scrivere a infoocean4future@gmail.com e provvederemo immediatamente alla correzione dell\u2019articolo<\/p>\n<p><span style=\"font-size: 10.0pt;\">&nbsp;<\/span><\/p>\n<a class=\"maxbutton-3 maxbutton maxbutton-pagina-principale\" target=\"_blank\" title=\"tooltip\" rel=\"nofollow noopener\" href=\"http:\/\/www.ocean4future.org\"><span class='mb-text'>PAGINA PRINCIPALE<\/span><\/a>\n<p>&nbsp;<\/p>\n<p><a class=\"maxbutton-13 maxbutton maxbutton-parte-i\" target=\"_blank\" title=\" tooltip\" rel=\"nofollow noopener\" href=\"https:\/\/www.ocean4future.org\/savetheocean\/archives\/35980\"><span class='mb-text'>PARTE I<\/span><\/a> <a class=\"maxbutton-14 maxbutton maxbutton-parte-ii\" target=\"_blank\" title=\" tooltip\" rel=\"nofollow noopener\" href=\"https:\/\/www.ocean4future.org\/savetheocean\/archives\/49673\"><span class='mb-text'>PARTE II<\/span><\/a> <a class=\"maxbutton-15 maxbutton maxbutton-parte-iii\" target=\"_blank\" title=\" tooltip\" rel=\"nofollow noopener\" href=\"https:\/\/www.ocean4future.org\/savetheocean\/archives\/49660\"><span class='mb-text'>PARTE III<\/span><\/a><\/p>\n<p>&nbsp;<\/p>\n","protected":false},"excerpt":{"rendered":"<p><span class=\"span-reading-time rt-reading-time\" style=\"display: block;\"><span class=\"rt-label rt-prefix\">tempo di lettura: <\/span> <span class=\"rt-time\"> 4<\/span> <span class=\"rt-label rt-postfix\">minuti<\/span><\/span>. . ARGOMENTO: OCEANOGRAFIA PERIODO: XX-XXI SECOLO AREA: DIDATTICA parole chiave: Sonar, multibeam, sub bottom profiler &nbsp; Dopo aver visto i sistemi acustici single e multibeam affrontiamo ora altre tipologie che trovano molti impieghi nel campo scientifico e civile Sub-bottom profiler Altri sistemi impiegati nella ricerca oceanografica e geologica (soprattutto nell\u2019off-shore) sono i sub-bottom profiler, [&hellip;]<\/p>\n","protected":false},"author":2380,"featured_media":49665,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"_monsterinsights_skip_tracking":false,"_monsterinsights_sitenote_active":false,"_monsterinsights_sitenote_note":"","_monsterinsights_sitenote_category":0,"footnotes":""},"categories":[14],"tags":[],"class_list":["post-49660","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-oceanografia"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.0 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>I Sub Bottom Profiler e molti altri: il futuro della ricerca - parte III &#8226; OCEAN4FUTURE autore<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.ocean4future.org\/savetheocean\/archives\/49660\" \/>\n<meta property=\"og:locale\" content=\"it_IT\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"I Sub Bottom Profiler e molti altri: il futuro della ricerca - parte III &#8226; OCEAN4FUTURE autore\" \/>\n<meta property=\"og:description\" content=\"tempo di lettura:  4 minuti. . 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