The Bubnoff unit (abbreviated B) is a unit of speed equal to 1 m / 106 a. In other words, 1 B is equal to 1 meter in 1,000,000 years, 1 millimeter in 1,000 years, or one micrometer per year.[1] It was defined in 1969.[2]
The Bubnoff unit is employed in geology to measure rates of lowering of earth surfaces due to erosion[3] and is named after the Russian (German-Baltic) geologist Serge von Bubnoff (1888–1957).[4] An erosion speed of 1 B also means that 1 m3 of earth is being removed from an area of 1 km2 in 1 year.[5] Compared to everyday phenomena, erosion is under most circumstances (excluding rapid events like landslides) an extremely slow process, calling for such a specialized unit. For instance, the current average rate of erosion over the Earth's landmasses has been estimated at 30 B (30 m in a million years). There are, however, great regional differences in erosion speed. As an extreme example, the watershed area of the Semani River in Albania is eroding at a rate of almost 3000 B (3 millimeters per year), the river having been estimated to transport about 4600 tons of earth per year from the average square kilometer in its watershed.[6]
The Bubnoff unit was introduced because of a desire for a standard unit to replace the multitude of units in use, such as feet per year, centimeters per year, meters per decade, and so on. One criticism leveled was that by introducing the Bubnoff unit, it would obscure the rate of erosion behind a unit no one besides specialists understood.[7]
1 m/s is equal to approximately 31,540,000,000,000 B.[8]
ReferencesEdit
^Allaby, Michael (2007). Encyclopedia of weather and climate. New York, USA. p. 501. ISBN9780816063505. OCLC 69792154.{{cite book}}: CS1 maint: location missing publisher (link)
^Fischer, A. G., 1969, Geological time-distance rates -- the Bubnoff unit: Geological Society of America Bulletin v. 80, p. 549-551.
^Allaby, Michael (2013). A Dictionary of Geology and Earth Sciences (4. ed.). Oxford University Press. p. 82. ISBN9780199653065. OCLC 835969159.
^Allaby, Michael; Park, Chris (2013). A Dictionary of Environment and Conservation (2. ed.). Oxford University Press. p. 60. ISBN9780199641666. OCLC 810946330.
^Kearey, P. (2001) The New Penguin Dictionary of Geology. Penguin, London, 336 pp.
^Hall, A. (1993) The Work of Rivers. In Duff, D. (ed.) Holmes' Principles of Physical Geology, Chapman & Hall, London, 312-345.
^Robert R. Berg and Anthony F. Gangi, Bubnoff Unit: An Objection, Geological Society of America Bulletin, v. 82, p. 3475-3476, December 1971
^"Convert 1 m/s (meter per second) to Bubnoff units". Convert 1 m/s (meter per second) to Bubnoff units. Wolfram Alpha. Retrieved 1 June 2021.
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bubnoff, unit, abbreviated, unit, speed, equal, other, words, equal, meter, years, millimeter, years, micrometer, year, defined, 1969, employed, geology, measure, rates, lowering, earth, surfaces, erosion, named, after, russian, german, baltic, geologist, serg. The Bubnoff unit abbreviated B is a unit of speed equal to 1 m 106 a In other words 1 B is equal to 1 meter in 1 000 000 years 1 millimeter in 1 000 years or one micrometer per year 1 It was defined in 1969 2 The Bubnoff unit is employed in geology to measure rates of lowering of earth surfaces due to erosion 3 and is named after the Russian German Baltic geologist Serge von Bubnoff 1888 1957 4 An erosion speed of 1 B also means that 1 m3 of earth is being removed from an area of 1 km2 in 1 year 5 Compared to everyday phenomena erosion is under most circumstances excluding rapid events like landslides an extremely slow process calling for such a specialized unit For instance the current average rate of erosion over the Earth s landmasses has been estimated at 30 B 30 m in a million years There are however great regional differences in erosion speed As an extreme example the watershed area of the Semani River in Albania is eroding at a rate of almost 3000 B 3 millimeters per year the river having been estimated to transport about 4600 tons of earth per year from the average square kilometer in its watershed 6 The Bubnoff unit was introduced because of a desire for a standard unit to replace the multitude of units in use such as feet per year centimeters per year meters per decade and so on One criticism leveled was that by introducing the Bubnoff unit it would obscure the rate of erosion behind a unit no one besides specialists understood 7 1 m s is equal to approximately 31 540 000 000 000 B 8 References Edit Allaby Michael 2007 Encyclopedia of weather and climate New York USA p 501 ISBN 9780816063505 OCLC 69792154 a href Template Cite book html title Template Cite book cite book a CS1 maint location missing publisher link Fischer A G 1969 Geological time distance rates the Bubnoff unit Geological Society of America Bulletin v 80 p 549 551 Allaby Michael 2013 A Dictionary of Geology and Earth Sciences 4 ed Oxford University Press p 82 ISBN 9780199653065 OCLC 835969159 Allaby Michael Park Chris 2013 A Dictionary of Environment and Conservation 2 ed Oxford University Press p 60 ISBN 9780199641666 OCLC 810946330 Kearey P 2001 The New Penguin Dictionary of Geology Penguin London 336 pp Hall A 1993 The Work of Rivers In Duff D ed Holmes Principles of Physical Geology Chapman amp Hall London 312 345 Robert R Berg and Anthony F Gangi Bubnoff Unit An Objection Geological Society of America Bulletin v 82 p 3475 3476 December 1971 Convert 1 m s meter per second to Bubnoff units Convert 1 m s meter per second to Bubnoff units Wolfram Alpha Retrieved 1 June 2021 nbsp This geomorphology article is a stub You can help Wikipedia by expanding it vte Retrieved from https en wikipedia org w index php title Bubnoff unit amp oldid 1042754373, wikipedia, wiki, book, books, library,
