scholarly journals Effects of Floodplain Vegetation on Momentum Transfer in Compound Channel

2011 ◽  
Vol 67 (2) ◽  
pp. I_549-I_557 ◽  
Author(s):  
Fumiaki HASEGAWA ◽  
Takuya YAMAMOTO ◽  
Fatima JAHRA ◽  
Yoshihisa KAWAHARA
Keyword(s):  
Momentum Transfer ◽  
Compound Channel ◽  
Floodplain Vegetation

scholarly journals An analytical solution for flow estimation of a meandering compound channel

2018 ◽  
Vol 40 ◽  
pp. 06043
Author(s):  
Arpan Pradhan ◽  
Kishanjit Kumar Khatua
Keyword(s):  
Momentum Transfer ◽  
Analytical Model ◽  
Force Balance ◽  
Channel Cross Section ◽  
Small Scale ◽  
Data Sets ◽  
Compound Channel ◽  
Mean Velocity ◽  
Dimensional Parameter ◽  
Flow Estimation

An analytical model is proposed to determine the discharge capacity in a meandering compound channel. The channel cross-section is divided into four sub-sections, such as the lower main channel, the floodplain within the meander belt and the two outer floodplains. Momentum transfer in-between these four subsections is taken into consideration in the analytical model. The model basically determines the force balance of each individual subsection to predict its mean velocity and thereby the sub-sectional discharge. The paper suggests a non-dimensional parameter, αT, which is the momentum transfer coefficient, that is determined to be unique for each individual channel. The paper deals with the calibration of this parameter for both largescale and small-scale data sets.

Momentum Transfer In A Compound Channel

1978 ◽  
Vol 16 (2) ◽  
pp. 139-150 ◽  
Author(s):  
W. R. C. Myers
Keyword(s):  
Momentum Transfer ◽  
Compound Channel

LACBED with Quantitative Anomalous Absorption Corrections

1990 ◽  
Vol 48 (2) ◽  
pp. 528-529
Author(s):  
C.J. Rossouw ◽  
L.J. Allen ◽  
P.R. Miller
Keyword(s):  
Momentum Transfer ◽  
Scattering Amplitude ◽  
Incident Beam ◽  
Waller Factor ◽  
Beam Momentum ◽  
Anomalous Absorption ◽  
Quantitative Calculation ◽  
Ewald Sphere ◽  
Image Position ◽  
Incident Beam Energy

An Einstein model for thermal diffuse scattering (TDS) has enabled quantitative calculation of the absorptive potential V'(r). This allows anomalous absorption to be accounted for in LACBED contrast. Fourier coefficients Vg-h of the absorptive component from each atom α are calculated from integrals of the formwhere fα is the scattering amplitude and M(Q) the Debye-Waller factor. Integration over the Ewald sphere (dΩ) requires the momentum transfer q to have values up to 2ko (the incident beam momentum). Dynamical ‘dechannelling’ is accounted for by the terms g ≠ h. The crystal absorptive potential is obtained by coherently summing over these atomic absorptive potentials within the unit cell. Unlike the elastic potential, the absorptive potential is a strong function of incident beam energy Eo, since the range of momentum transfer q and associated solid angles dΩ change with the Ewald sphere radius.Fig. 1 shows a LACBED pattern of the zeroth order beam from Si aligned along a <001> zone axis.

Sign in / Sign up

Export Citation Format

Share Document