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The Mystery Behind Singing Sand Dunes Have you ever heard a singing sand dune that produces booming sounds of low frequency? The sound is a cross between a low-flying plane and a didgeridoo. Its believed to last for 15 minutes and can go up to 115 decibels, so it can be heard even 10 kms away. There are only 30 known places in the world where this natural sound can be heard, and its truly amazing. Singing dunes, as they are called, is a phenomena that has marvelled everyone – from explorer Marco Polo, who was the first person to document this when he was in China, and he described it as ‘the sounds of all kinds of musical instruments.’ Even scientists have wondered how this is caused. The sound is produced when sand cascades down the face of a dune in an avalanche. The avalanche can be created by the wind, people sliding down the dune, or even walking on the top of the dune. How does these sand movements make the dunes sing has been the enduring mystery of the desert. Two scientists, who tried to solve this, also had a fallout on the outcome. One of them explained that these sand waves, formed due to collision between grains, synchronize the collisions, so they are all on basically the same beat. The surface of the avalanche acts like a loudspeaker transmitting it through the air. Watch the video shot in Dumont Dunes in Death Valley, California. Both the scientists had different ideas on what caused the synchronisation. The sound “is mostly independent of the avalanche thickness and of the dune size but depends on the sand grain’s diameter,” said Dr Andreotti. While his rival researcher Prof Douady, visited dunes around the world and brought back sand to his laboratory to reproduce the sound. He stated, “We are making singing avalanches on a plate in the laboratory, so we are finding that the dune itself is not necessary.” However, what’s clear is that the dunes only sing in hot and dry weather. The most beautiful dune tune comes from the sands of Oman. The least musical were those from China, which hardly sang at all. Singing dunes are also found in California, Michigan, Nevada, the Booming Dunes in the Namib Desert, Africa, Porth Oer near Aberdaron in Wales, Indiana Dunes in Indiana, Almaty Province in Kazakhstan to name a few.
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Mystery Iza Pjevanje pješčane dine Jeste li ikada čuli za pjevačku dina koji proizvodi gromak zvukove niskih frekvencija? Zvuk je križ između niskom letu zrakoplovom i A didgeridoo. Njegova vjeruje da traje 15 minuta, a može ići i do 115 decibela, tako da se može čuti čak i 10 km udaljen. Postoje samo 30 Poznatija mjesta u svijetu u kojem je to prirodna zvuk se može čuti, i njegov doista nevjerojatna. Pjevanje dinama, kako su ih zvali, je fenomen koji je u čudu svima – iz istraživač Marko Polo, koji je bio prva osoba koja je ovaj dokument, kada je bio u Kini, te ga je opisao kao 'zvukove svih vrsta glazbenih instrumenata.’ Čak su se znanstvenici pitali kako je to uzrokovalo. The Zvuk se proizvodi kada pješčane kaskade niz lice dina u lavini. Lavina može biti izrađen od vjetra, ljudi spuštanju dinu, ili čak i hodanje na vrhu dina. Kako to pijesak pokreti dine pjevaju bio trajni misterij pustinji. Dva znanstvenika, koji je pokušao riješiti ovaj, također je imao posljedice na ishod. Jedan od njih je objasnio da su ti valovi pijesak, formirana zbog sudara između žitarica, sinkronizirati sudara, tako da su svi na osnovi isti beat. Površina od lavina djeluje poput zvučnika ga emitira kroz zrak. Pogledajte video snimak u Dumont dinama u Dolini smrti, Kalifornija. Oba su znanstvenici imali različite ideje o tome što je uzrokovalo sinkronizaciju. Zvuk “je uglavnom neovisna o debljini lavina i veličine dina, ali ovisi o promjeru pješčane žita u,” , rekao je dr. Andreotti. Dok je njegov suparnik istraživač prof Douady, posjetili dine diljem svijeta i vratio pijesak na svom laboratoriju reproducirati zvuk. Izjavio, “Ulažemo pjevačke lavine na tanjuru u laboratoriju, pa smo spoznaju da sama Dina nije potrebno.” Međutim, ono što je jasno je da su dine pjevaju samo u toplom i suhom vremenu. Najljepši dune tune dolazi iz pijeska Omanu. Najmanje glazbena bile one iz Kine, koji jedva da je pjevala na sve. Pjevanje dine se također nalaze u Kaliforniji, Michigan, Nevada, procvatu dinama u pustinji Namib, Africa, Porth OER blizini Aberdaron u Walesu, Indiana Dunes u Indiani, Almaty Province u Kazahstanu u ime nekoliko.