Assessment of the hydraulic roughness of the main channel bed

The    purpose    of   the    study   was    to   determine   the    roughness   coefficient of the  main channel bed BP-1  of the  Sarpinskaya watering-irrigation system  (SWIS) and  to compare the  data   obtained with   the  normative values.   The  materials for  performing the  calculations were: an explanatory note to the project of the second stage of the construction of the SWIS, passports of the main and inter-farm channels of the system (2015), a technical report of the operating organization for 2021, data of full-scale measurements of the depths and velocities of the water flow in the considered alignment using the «speed-area» method, the results  of full-scale surveys  of the water supply network and  HTS SWIS, as well as data from GIS maps  and literary  sources. The methodology for calculating the elements of the live section  of the  channels took into  account  the  recommendations of SP  100.13330.2016. The  calculation of the roughness coefficients of the channels was carried out using known dependencies, including the Chezy formula, the  Manning equation, the  dependencies of I.I. Agroskin and  N.N. Pavlovsky. The  elements of the living  section are determined and the values of the roughness coefficient in the considered alignment of the main channel are obtained. At the same  time,  the calculated values  of the roughness coefficient obtained have good convergence (the deviation of the results  does not exceed –2.8%). However, the obtained values  exceed the normative value  of the roughness coefficient  by 1.6-1.64  times,  which  is explained not only by the overgrowth of the channel bed with  aquatic vegetation, but also by the peculiarity of the shape of the cross-section  of this  channel, which  in the area under consideration has a significant width along the bottom. The calculated values of the roughness coefficient obtained indicate the overgrowth of the main canal bed, which was confirmed during field surveys of the water supply network of this canal in the spring of 2022.  In  view  of this,  it  is  necessary  to carry  out  preventive measures in  a timely manner aimed at reducing the additional hydraulic resistance caused by overgrowth of the riverbed with vegetation.

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