Traduzione

Messaggioda Münchhausen » 05/08/2019, 09:10

Per favore mi aiutate a tradurre questo testo. Non Riesco a capire il senso.



note that this hydraulic radius is available for the vegetated
flume or channel if and only if $A'=BL_2$, $A''=BL_2$.

In fact, the existence of vegetation results in the local head
loss, compared with the processing head loss for bed re-
sistance. Herein the local head loss caused by vegetation is
divided by the bed surface ($BL_2$) equally in the flow direc-
tion [19,20], which is thought to be the processing head loss
combined with bed resistance, because the processing head
loss is equal for the uniform flow and vegetated flow is al-
ways treat as quasi-uniform flow [5,17,21]. The value
of A'' is the contact area between the water and the bed sur-
face.

Based on the eq. (17) and the value of A'' , the actual
value of bed resistance could be gotten. However, in order
to get a constant value of the processing head loss, we also
need to transform A'' into A' but the bed resistance is not
change. So the bed-related radius is also equal to

$r_v$ and the same results are obtained as eq. (2) by using similar
method of eq. (21). In fact, eq. (2) expresses the hydraulic
radius for flow with vegetation and bedform. For the vege-
tation-related hydraulic radius, i.e. =bed-related radius
which also yields the same results as eq. (2), the
$r_v$ is available for the flow with vegetation.
As for the case of the ignorance of bed resistance, sub-
stituting $A'=BL_2$ into eq. (12), we can get the hydraulic
radius same as the formation of eq. (22).
In order to unite the formation of the hydraulic radius in
the vegetated flow, herein we used eq. (22) to avoid the
problem of the existence of the bed resistance.

Il testo è tratto dalla seguente pubblicazione (pag. 2-3):
https://www.researchgate.net/publication/271951655_An_experimental_study_of_the_incipient_bed_shear_stress_partition_in_mobile_bed_channels_filled_with_emergent_rigid_vegetation
Münchhausen
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