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Investigation of flow in open channels with very small slopes

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Hydrotechnical Construction Aims and scope

Conclusions

  1. 1.

    A weak flow regime is observed in prismatic canals with slopes of the free surface of the flow I≲1·10−5.

  2. 2.

    A change in the kinematic structure of the flow upon a change of the flow regime is accompanied by a change in the law of resistance. The regime of a (weak) flow is characterized by a pronounced increase of the resistance coefficient with decrease of slope and Reynolds number. Calculation of the mean velocity by the Chezy-Manning formula with the usual roughness coefficient for a gradient flow regime is unacceptable.

  3. 3.

    The method of determining the boundary between stream and gradient (or weak) flow regime proposed in [1] is completely reliable and can be recommended for use when designing reclamation canals being constructed under conditions of very small slopes of the terrain.

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Literature cited

  1. V. S. Verbitskii and O. M. Ivanova, “Some predictive estimates of the hydraulic regime of the main diversion canal of Siberian rivers,” Tr. VNIIGiM, 69-76 (1980).

  2. A. N. Ospanov, “Runoff flows and natural stream regime,” Gidrotekh. Melior., No. 1, 26–28, 1984.

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  3. D. I. Grinval'd, Turbulence of Channel Flows [in Russian], Gidrometeoizdat, Leningrad (1974).

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  4. G. V. Zheleznyakov, Capacity of Canal and River Channels [in Russian], Gidrometeoizdat, Leningrad (1981).

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  5. V. A. Znamenskii, Hydrological Processes and Their Role in the Formation of Water Quality [in Russian], Gidrometeoizdat, Leningrad (1981).

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Authors
  1. Kh. Sh. Shapiro
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  2. V. S. Verbitskii
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  3. A. N. Ospanov
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Additional information

Translated from Gidrotekhnicheskoe Stroitel'stvo, No. 4, pp. 23–26, April, 1986.

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Shapiro, K.S., Verbitskii, V.S. & Ospanov, A.N. Investigation of flow in open channels with very small slopes. Hydrotechnical Construction 20, 224–228 (1986). https://doi.org/10.1007/BF01428953

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  • DOI: https://doi.org/10.1007/BF01428953

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