| A B C D E F G H I J K L M N O P Q R S T U V W X Y Z | ||
First Edition Preface Second Edition Preface Acknowledgments
Section S S index 321-329 of 1376 terms
Previous 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 Next
shearing deformation—See deformation.
shearing instability—1. Same as Helmholtz instability. 2. A complex hydrodynamic instability phenomenon exhibited by a stratified shear flow. A necessary condition for this type of instability is that the local Richardson number is somewhere less than one-quarter.
Drazin, P. G., and W. H. Reid, 1981: Hydrodynamic Stability, Cambridge University Press, 325–333.
shearing stress—Any of the tangential components of the stress tensor. In meteorology, the shearing stress is often that on a horizontal surface in the direction of the wind: where μ is the dynamic (molecular) viscosity, u the wind speed, and z the vertical coordinate. A corresponding eddy stress, or Reynolds stress, may be defined, with an eddy viscosity in place of the molecular viscosity. See also surface friction, Newtonian friction law.
shearing wave—See transverse wave.
sheet erosion—(Also called sheet wash.) Erosion of thin layers of earth-surface material, more or less evenly, from extended areas of gently sloping land by broad continuous sheets of running water, without the formation of rills, gullies, or other channelized flow.
sheet flow—Same as laminar flow.
sheet frost—A thick coating of rime formed on windows and other surfaces.
sheet ice—Ice formed in a smooth thin layer on a water surface by the coagulation of frazil through rapid freezing.
sheet lightning—(Also called luminous cloud.) A diffuse, but sometimes fairly bright, illumination of those parts of a thundercloud that surround the path of a lightning flash, particularly a cloud discharge or cloud-to-cloud discharge. Thus, sheet lightning is no unique form of lightning but only one manifestation of ordinary lightning types in the presence of obscuring clouds. Compare heat lightning.
sheet wash—Same as sheet erosion.
Previous 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 Next