Zobrazeno 1 - 10
of 24
pro vyhledávání: '"Brian B. Willetts"'
Autor:
Simon Tait, Michael Sørensen, Brian B. Willetts, Derek G. Goring, John Heald, Gavin Cunningham, Ian McEwan
Publikováno v:
University of Copenhagen
This paper proposes that the changes which occur in composition of the bed load during the transport of mixed-grain-size sediments are largely controlled by the distributions of critical entrainment shear stress for the various size fractions. This h
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::3a2eaeb5cc6f41fbb714b6379d9c8c61
https://doi.org/10.1061/(asce)0733-9429(2004)130:2(129)
https://doi.org/10.1061/(asce)0733-9429(2004)130:2(129)
Autor:
Jasem M. Al-Awadhi, Brian B. Willetts
Publikováno v:
Earth Surface Processes and Landforms. 24:423-435
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::ea12ef696c2953bc9c343126ed24440c
https://doi.org/10.1002/(sici)1096-9837(199905)24:5<423::aid-esp998>3.0.co
https://doi.org/10.1002/(sici)1096-9837(199905)24:5<423::aid-esp998>3.0.co
Wind erosion has such a pervasive influence on environmental and agricultural matters that academic interest in it has been continuous for several decades. However, there has been a tendency for the resulting publications to be scattered widely in th
Autor:
Ole E Barndorff-Nielsen, Brian B. Willetts, C. Christiansen, J.C.R. Hunt, K. Hutter, J.T. Moller, K.R. Rasmussen, M. Sorensen, F. Ziegler
Wind erosion has such a pervasive influence on environmental and agricultural matters that academic interest in it has been continuous for several decades. However, there has been a tendency for the resulting publications to be scattered widely in th
Autor:
Jasem M. Al-Awadhi, Brian B. Willetts
Publikováno v:
Earth Surface Processes and Landforms. 23:21-30
Wind tunnel experiments were conducted with a well mixed, flat sand bed, 5·7 m in length, to study the initial sand flux response at three different shear velocities. In some experiments, the bed was allowed to deplete without replenishment; in othe
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::afa48bf20618014a97965b6b62809b2b
https://doi.org/10.1002/(sici)1096-9837(199801)23:1<21::aid-esp815>3.0.co
https://doi.org/10.1002/(sici)1096-9837(199801)23:1<21::aid-esp815>3.0.co
Publikováno v:
Earth Surface Processes and Landforms. 21:279-293
Saltating particles increase the rate of dust release from sediments in arid and semi-arid areas. They also break interparticle bonds in aggregated and crusted soils, thereby increasing the number of particles available for entrainment. This pilot st
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::6fb88b845c0954940810b30a96bf09bd
https://doi.org/10.1002/(sici)1096-9837(199603)21:3<279::aid-esp633>3.0.co
https://doi.org/10.1002/(sici)1096-9837(199603)21:3<279::aid-esp633>3.0.co
Publikováno v:
Sedimentology. 43:21-31
High-speed photography was used to record saltating sand grains colliding with a horizontal, noncohesive bed of similarly sized grains. Impacting grain/bed interaction is discussed in general. The process, as observed from the films, is then describe
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::996fed93323de8ad591836e62afbc386
https://doi.org/10.1111/j.1365-3091.1996.tb01456.x
https://doi.org/10.1111/j.1365-3091.1996.tb01456.x
Publikováno v:
Sedimentology. 42:695-706
Collision data are presented from coloured high-speed films of three size fractions of sand grains saltating over a bed of the total grain population. Each fraction was colour tagged and the proportion of each size ejected by grains colliding with th
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::01f95b9753b3a692f30b005ea0fc1d5c
https://doi.org/10.1111/j.1365-3091.1995.tb00401.x
https://doi.org/10.1111/j.1365-3091.1995.tb00401.x
Autor:
Brian B. Willetts, Ian McEwan
Publikováno v:
Journal of Fluid Mechanics. 252:99-115
A model of wind-blown sand transport is described with particular emphasis on the feedback between the grain cloud and the near-surface wind. The results from this model are used to develop Owen's (1964) hypothesis that ‘the grain layer behaves, so
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::5477b2487b6056434d565fad4a840134
https://doi.org/10.1017/s0022112093003684
https://doi.org/10.1017/s0022112093003684
Publikováno v:
Sedimentology. 39:971-981
In the last decade much progress has been made toward the development of a comprehensive model of aeolian sediment transport in which the grain/bed collision has been identified as having a significant role. The grain/bed collision has been studied b
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::31c08f95803972c4d82809fead86ce18
https://doi.org/10.1111/j.1365-3091.1992.tb01991.x
https://doi.org/10.1111/j.1365-3091.1992.tb01991.x