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دسته بندی:
فیزیک عمومی - General Physics
سال انتشار:
2020
عنوان انگلیسی مقاله:
Flow resistance law under suspended sediment laden conditions
ترجمه فارسی عنوان مقاله:
جریان قانون مقاومت تحت شرایط مملو از رسوب معلق
منبع:
Sciencedirect - Elsevier - Flow Measurement and Instrumentation, 74 (2020) 101771: doi:10:1016/j:flowmeasinst:2020:101771
نویسنده:
Costanza Di Stefano a, Alessio Nicosia a, Vincenzo Palmeri b, Vincenzo Pampalone a, Vito Ferro b,*
چکیده انگلیسی:
The uniform flow resistance equation, in the form due to Manning or Darcy-Weisbach, is widely applied to
establish the stage-discharge relationship of a river cross-section. The application of this equation, namely the
slope-area method, allows to indirectly measure the corresponding river discharge by measurements of bed
slope, water level, cross-section area, wetted perimeter and an estimate of channel roughness. In this paper, a
recently deduced flow resistance equation for open channel flow was tested during conditions of suspended
sediment-laden flow. First, the flow resistance equation was determined by dimensional analysis and by applying
the condition of incomplete self-similarity for the flow velocity profile. Then the analysis was developed by the
following steps: (i) for sediment-laden flows characterized by known values of mean diameter and concentration
of suspended sediments, a relationship (Eq. (28)) between the Γ function of the velocity profile, the channel slope
and the Froude number was calibrated by the available measurements; and (ii) a relationship for estimating the Γ
function (Eq. (29)) which also takes into account the mean concentration of suspended particles was also
established. The theoretical flow resistance law (Eq. (26)) coupled with the relationship for estimating the Γ
function (Eq. (28) or Eq. (29)), which is characterized by the applicability of a wide range of flow conditions,
allowed to estimate the Darcy-Weisbach friction factor for flows with suspended-load. The analysis showed that
for large-size mixtures the Darcy-Weisbach friction factor can be accurately estimated neglecting the effect of
mean concentration of suspended sediments while for small-size mixtures the friction factor decreases when the
mean sediment concentration increases.
Keywords: Flow resistance | Suspended-load | Dimensional analysis | Self-similarity | Flow velocity profile
قیمت: رایگان
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