Measurement of hydrometeors microphysical characteristics, such as size, shape, fall velocity
, and their spatial distribution, is of high interest in fields of precipitation physics, numerical weather prediction models, ground validation of satellite remote sensing, electromagnetic wave propagation, and other climatological and hydrological applications [1-3].
2 how a scaling factor on the ice crystal fall velocity
(process h in Fig.
For an accuracy simulation, it is necessary to consider the specific weight of each particle, as well as the fall velocity
. The movement of the particles in the next time step n +1 is calculated from the previous step n as follows:
Yen, Sediment fall velocity
in oscillating flow, University of Virginia, USA, 1992.
Key Words:Reservoir Sedimentation; Sediment carrying capacity; Threshold value of sedimentation Fall velocity
Sediment Deposition Rate.
The deposition of coarse particles increases with discharge growing much more intensively, because the fall velocity
of the particles is also much higher.
One of the physical parameters of raindrops is their size, associated with their volume and their fall velocity
The increase in volume of a collector particle of radius [R.sub.x] falling within an environment of smaller cloud particles of radius Ry and fall velocity
u([R.sub.y]) reads (see for instance Rodgers & Yau, 1979):
The mean gravitational fall velocity
of dead larvae was 0.33 cm [s.sup.-1] (SD = 0.04, n = 27).
This level is also marked by high values of SW, indicating a spread in total particle fall velocity
and/or an increase in turbulence.
The size, shape, and fall velocity
of precipitation particles and their spatial distributions are important microphysical parameters playing key roles in many branches of research, such as quantitative precipitation estimation (QPE) by weather radar , assessment of electromagnetic wave propagation in troposphere , study on kinetic energy of raindrops and soil erosion , validation of simulated microphysics in numerical weather models , and parameterization of washout efficiency of particle-bound radionuclides and atmospheric pollutants in general [5, 6].
The others are evaluated by the balance of pick-up and settling down according to the concentration and sediment fall velocity
, and the relevant concentration denotes the vertical sediment flux strength.