Subhasish Dey Explained

Subhasish Dey শুভাশীষ দে
Birth Place:	Jalpaiguri, West Bengal, India
Nationality:	n
Field:	Hydrodynamics
Work Institution:	Indian Institute of Technology Jodhpur (2023–), Indian Institute of Technology Kharagpur (1998–2023), National Institute of Technology Durgapur (1984–98)
Alma Mater:	University of North Bengal (BE 1981) Indian Institute of Technology Kharagpur (MTech 1984 and PhD 1992)
Known For:	Hydraulic engineering, Sediment transport, Turbulence
Prizes:	ASCE Hans Albert Einstein Award in 2022

Subhasish Dey (Bengali: শুভাশীষ দে; born 1958) is a hydraulician and educator. He is known for his research on the hydrodynamics and acclaimed for his contributions in developing theories and solution methodologies of various problems on hydrodynamics, turbulence, boundary layer, sediment transport and open channel flow. He is currently a distinguished professor of Indian Institute of Technology Jodhpur (2023–). Before, he worked as a professor of the department of civil engineering, Indian Institute of Technology Kharagpur (1998–2023),^[1] where he served as the head of the department during 2013–15 and held the position of Brahmaputra Chair Professor during 2009–14 and 2015. He also held the adjunct professor position in the Physics and Applied Mathematics Unit^[2] at Indian Statistical Institute Kolkata^[3] during 2014–19. Besides he has been named a distinguished visiting professor at the Tsinghua University in Beijing, China.^[4]

Dey is an associate editor of Journal of Geophysical Research – Earth Surface,^{[5] [6]} Journal of Hydraulic Engineering,^{[7] [8]} Journal of Hydraulic Research,^{[9] [10]} Sedimentology,^{[11] [12]} Acta Geophysica,^{[13] [14] [15]} Journal of Hydro-Environment Research,^{[16] [17]} International Journal of Sediment Research^[18] and Journal of Numerical Mathematics and Stochastics.^[19] He is also an editorial board member of several journals including the Proceedings of the Royal Society of London A: Mathematical, Physical and Engineering Sciences.^[20]

Brief biography

Dey was born to Bimalendu Dey (father) and Kana Dey (mother) in Jalpaiguri town, West Bengal, India in 1958. In 1987, he married Swastika Dey (née Talukdar); and they have a son, Sibasish, and a daughter, Sagarika.^[21]

Career

Dey received B.E. degree in civil engineering from the University of North Bengal in 1981, MTech degree in water resources engineering and PhD degree in hydraulic engineering from the Indian Institute of Technology Kharagpur in 1984 and 1992, respectively.^[21] He started his professional career as a faculty of the National Institute of Technology Durgapur, where he taught fluid mechanics and hydraulics from 1984 to 1998. Then, he joined as a faculty of the Indian Institute of Technology Kharagpur in 1998 and worked until June, 2023. Since July, 2023, he serves Indian Institute of Technology Jodhpur as a distinguished professor.

Honors

Dey has become a fellow of the Indian National Science Academy (FNA), Indian Academy of Sciences (FASc), National Academy of Sciences, India (FNASc) and Indian National Academy of Engineering (FNAE).^[22] He received the JC Bose Fellowship award in 2018. He is the vice president of the council of World Association for Sedimentation and Erosion Research (WASER) (2019–2022). He served as a Council Member^{[23] [24]} of the World Association for Sedimentation and Erosion Research (WASER) (2011–2013) and the International Association for Hydro-Environment Engineering and Research (IAHR) (2015–2019). He is also a Member of the IAHR Fluvial Hydraulics Committee. Dey is ranked among the 150 most cited researchers in civil engineering in Shanghai’s Global Ranking of Academics. Dey was conferred with the Hans Albert Einstein Award for “his fundamental contribution to the fluvial sediment transport, turbulence mechanism, local scour, and alluvial river dynamics from the perspectives of research, education and practice” from the ASCE in 2022.

Contributions

He has developed various theories of hydrodynamics. He discovered the origin of the scaling laws of sediment transport and the onset of a straight river to meander. In turbulence, he developed universal probability density function for turbulent velocity fluctuations, Reynolds stress and conditional Reynolds shear stresses in wall-shear flows. In fluvial hydraulics, he has contributed fundamental theories of sediment thresholds (also known as initiation of motion), discovered existence of negative hydrodynamic lift and non-universality of von Kármán constant. He has made pioneering contributions to the mechanism of scour at hydraulic structures. Besides, he has developed theories of secondary boundary layer in curved pipes, wall jets, seeping bed flows and turbulent bursting etc.

Books

• Book: Dey, S. . Fluvial Hydrodynamics: Hydrodynamic and Sediment Transport Phenomena . Springer . 2014 . 978-3-642-19061-2 . GeoPlanet: Earth and Planetary Sciences .

Further reading

• E. Padhi, N. Penna, S. Dey and R. Gaudio (2018). "Spatially-averaged dissipation rate in flows over water-worked and screeded gravel beds". Physics of Fluids, American Institute of Physics (AIP), Vol. 30, No. 12, pp. 125106.
• E. Padhi, N. Penna, S. Dey and R. Gaudio (2018). "Hydrodynamics of water-worked and screeded gravel beds: A comparative study". Physics of Fluids, American Institute of Physics (AIP), Vol. 30, No. 8, pp. 085105.
• H. Fang, X. Han, G. He and S. Dey (2018). "Influence of permeable beds on hydraulically macro-rough flow". Journal of Fluid Mechanics, Cambridge University Press, UK, Vol. 847, No. July, 552–590.
• S. Dey and S. Z. Ali (2018). "Review Article: Advances in modeling of bed particle entrainment sheared by turbulent flow". Physics of Fluids, American Institute of Physics, Vol. 30, No. 6, pp. 061301.
• S. Z. Ali and S. Dey (2018). "Impact of phenomenological theory of turbulence on pragmatic approach to fluvial hydraulics". Physics of Fluids, American Institute of Physics, Vol. 30, No. 4, pp. 045105.
• S. Z. Ali and S. Dey (2017). "Hydrodynamic instability of a meandering channel". Physics of Fluids, American Institute of Physics, Vol. 29, No. 12, pp. 125107.
• S. Dey and S. Z. Ali (2017). "Origin of the onset of meandering a straight river". Proceedings of the Royal Society A, London, UK, Vol. 473, No. August, pp. 20170376.
• S. Dey, G. Ravi Kishore, O. Castro-Orgaz and S. Z. Ali (2017). "Hydrodynamics of submerged turbulent plane offset jets". Physics of Fluids, American Institute of Physics, Vol. 29, No. 6, pp. 065112.
• S. Dey and S. Z. Ali (2017). "Stochastic mechanics of loose boundary particle transport in turbulent flow". Physics of Fluids, American Institute of Physics, Vol. 29, No. 5, pp. 055103.
• S. Dey and S. Z. Ali (2017). "Mechanics of sediment transport: Particle scale of entrainment to continuum scale of bedload flux". Journal of Engineering Mechanics, American Society of Civil Engineers (ASCE), Vol. 143, No. 11, pp. 04017127.
• S. Z. Ali and S. Dey (2017). "Origin of the scaling laws of sediment transport". Proceedings of the Royal Society A, London, UK, Vol. 473, Issue 2197, pp. 20160785.
• S. Z. Ali and S. Dey (2016). "Mechanics of advection of suspended particles in turbulent flow". Proceedings of the Royal Society A, London, UK, Vol. 472, Issue, 2195, pp. 20160749.
• S. Z. Ali and S. Dey (2016). "Hydrodynamics of sediment threshold". Physics of Fluids, American Institute of Physics, Vol. 28, No. 7, pp. 075103.
• S. Dey and R. Das (2012). "Gravel-bed hydrodynamics: A double-averaging approach". Journal of Hydraulic Engineering, American Society of Civil Engineers (ASCE), Vol. 138, No. 8, 707–725.
• S. Dey, S. Sarkar and F. Ballio (2011). "Double-averaging turbulence characteristics in seeping rough-bed streams". Journal of Geophysical Research, Earth Surface, American Geophysical Union, Vol. 116, F03020, doi:10.1029/2010JF001832
• S. Dey, T. K. Nath and S. K. Bose (2010). "Submerged wall-jets subjected to injection and suction from the wall". Journal of Fluid Mechanics, Cambridge University Press, UK, Vol. 653, 57–97.
• R. Gaudio, R. Miglio and S. Dey (2010). "Nonuniversality of von Kármán’s κ in fluvial streams". Journal of Hydraulic Research, International Association for Hydraulic Research (IAHR), Vol. 48, No. 5, 658–663.
• S. K. Bose and S. Dey (2010). "Universal probability distributions of turbulence in open channel flows". Journal of Hydraulic Research, International Association for Hydraulic Research (IAHR), Vol. 48, No. 3, 388–394.
• S. K. Bose and S. Dey (2009). "Reynolds averaged theory of turbulent shear flow over undulating beds and formation of sand waves". Physical Review E, The American Physical Society, Vol. 80, 036304.
• S. K. Bose and S. Dey (2007). "Theory of free surface flow over rough seeping beds". Proceedings of the Royal Society A, London, UK, Vol. 463, No. February, 369–383.
• S. Dey and A. Sarkar (2006). "Response of velocity and turbulence in submerged wall jets to abrupt changes from smooth to rough beds and its application to scour downstream of an apron". Journal of Fluid Mechanics, Cambridge University Press, UK, Vol. 556, 387–419.
• S. Dey (2002). "Secondary boundary layer and wall shear for fully developed flow in curved pipes". Proceedings of the Royal Society A, London, UK, Vol. 458, No. February, 283–294.
• S. Dey (1999). "Sediment threshold". Applied Mathematical Modelling, Elsevier, Vol. 23, No. 5, 399–417.
• S. Dey, S. K. Bose and G. L. N. Sastry (1995). "Clear water scour at circular piers: a model". Journal of Hydraulic Engineering, American Society of Civil Engineers (ASCE), Vol. 121, No. 12, 869–876.

Notes and References

1. Web site: Indian Institute of Technology Kharagpur.
2. http://www.isical.ac.in/~pamu/faculty_list.php Physics and Applied Mathematics Unit
3. Web site: Indian Statistical Institute Kolkata .
4. Web site: 清华大学 - Tsinghua University.
5. Web site: Journal of Geophysical Research: Earth Surface. 10.1002/(ISSN)2169-9011.
6. Web site: Journal of Geophysical Research: Earth Surface. 10.1002/(ISSN)2169-9011.
7. http://ascelibrary.org/journal/jhend8 Journal of Hydraulic Engineering
8. Web site: Aims & Scope and Editorial Board (ASCE).
9. Web site: Welcome to the Home Page of the Journal of Hydraulic Research!.
10. Web site: Journal of Hydraulic Research - Editorial board.
11. Sedimentology. Wiley. 10.1111/(ISSN)1365-3091.
12. Sedimentology - Editorial Board Library. Wiley. 10.1111/(ISSN)1365-3091.
13. https://www.springer.com/earth+sciences+and+geography/geophysics/journal/11600 Acta Geophysica
14. Web site: Acta Geophysica. Grzegorz. Kwiatek.
15. https://www.springer.com/earth+sciences+and+geography/geophysics/journal/11600?detailsPage=editorialBoard Acta Geophysica, Editorial Board (Springer)
16. Book: Journal of Hydro-environment Research - Elsevier.
17. Book: Journal of Hydro-environment Research Editorial Board.
18. Web site: International Journal of Sediment Research - 1001-6279 - Elsevier. Elsevier.
19. Web site: Numerical Mathematics and Stochastics.
20. Web site: Proceedings of the Royal Society.
21. Web site: Marquis Who's Who.
22. http://www.the-couturiers.com/inae/show.asp?flag=0&srno=11 INAE Fellow
23. http://www.waser.cn/news%20and%20announcements/2010wasercouncilelectionresult.asp Council of WASER
24. Web site: International Association for Hydro-Environment Engineering and Research.