水流方向
2.For a time ,surface and subsurface currents are in opposite directions ;flow is seaward at the surface and landward nearthe bottom.
3.The hairs flutter in moving water as flags do in moving air, and the way in which they flutter contains information about the direction and speed of the water moving past them.
5.The paper briefly summarized the importance of the direction of distinguishing palaeo water flow directly by use of core and the method of determining accurrence of core foramtion,detaily described the four working steps of①dip angle correction of core formation,②seek real occurrence from inclined bedding viewing occurence,③seek dip azimuth by the example of inclined bedding,④determine palaeo water flow direction.
6.Water supplying pipe in front of the coal economizer should be installed with a stop valve and check valve for the factory using boiler of mother tube water supplying.
7.Based on analysing all kinds of sediment silting basins and their suitable conditions, the traditional sedimentation basin has been improved in three aspects, i. e., setting an adjusting flow board in the fore of setting basin, adding a spillway trough along the flow direction, and redesigning the flush gallery by adding auxiliary flushing facilities.
8.Abstract: Based on studies on the mechanism of sediment trapping by the vortex tube and flume and model experiments,three parameters are proposed:the diversion ratio,the trapping efficiency and the sediment carrying capacity of the vortex tube.These parameters reflect the economic index of water consumption and the effectiveness of silt trapping of the vortex tube.Besides,the relations of the angle of the tube axis to flow direction in the channel,the Froude number of flow in the channel,the vortex tube slot width and so on with the trapping effectiveness are studied respectively.On the basis of theoretical study of sorted settling of the suspended load,a method is suggested to calculate desilting and trapping of the suspended load,which has been used in the design of a desilting basin of a water power project.A hydro-electric project according to this design thought has been constructed already and has worked well for two flood seasons.
10.They are able to align themselves in the current like windsocks at an aerodrome, so that they find the best position for power generation.
