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Conditions favorable to the existence of an undulating jump

  • Investigations and Experiments
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Hydrotechnical Construction Aims and scope

Conclusions

  1. 1.

    In analyzing the boundaries of development of an undulating jump, it is necessary to distinguish the conditions of existence of departing and approaching undulating jumps.

  2. 2.

    The breaking process of both a departing and approaching undulating jump does not occur suddenly, but can be divided into several intermediate stages.

  3. 3.

    The scale effect makes itself felt to a certain degree on the criteria of the existence of an undulating jump.

  4. 4.

    In the initial section of an approaching undulating jump, the Froude number Fr1 does not clearly define the formation and conditions of the existence of this phenomenon. An approaching jump that is formed during an inflow from beneath a gate can be broken by increasing the depth of the tailrace for any value of Fr1, which is close to unity as is desired.

  5. 5.

    For field conditions, the Froude number Fr1=2.5 can, in first approximation, be considered a criterion characterizing the start of the break of the first wave for a departing undulating jump, and the coefficient of the degree of nonhydrostatics s1=1.07 as the criterion for an approaching jump; the Froude number Fr1=4.0 and the coefficient of the degree of nonhydrostatics s1=1.14 can be recommended as criteria characterizing the complete break of an undulating jump for the departing and approaching phenomena, respectively.

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Literature cited

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Authors
  1. A. A. Ryabenko
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Translated from Gidrotekhnicheskoe Stroitel'stvo, No. 12, pp. 29–34, December, 1990.

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Ryabenko, A.A. Conditions favorable to the existence of an undulating jump. Hydrotechnical Construction 24, 762–770 (1990). https://doi.org/10.1007/BF01434602

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