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    Temporal Variation of Scour Depth at Nonuniform Cylindrical Piers

    Source: Journal of Hydraulic Engineering:;2011:;Volume ( 137 ):;issue: 001
    Author:
    Jau-Yau Lu
    ,
    Zhong-Zhi Shi
    ,
    Jian-Hao Hong
    ,
    Jun-Ji Lee
    ,
    Rajkumar V. Raikar
    DOI: 10.1061/(ASCE)HY.1943-7900.0000272
    Publisher: American Society of Civil Engineers
    Abstract: The paper proposes a semiempirical model to estimate the temporal development of scour depth at cylindrical piers with unexposed foundations. A cylindrical pier with a foundation is considered as nonuniform pier. The concept of primary vortex and the principle of volumetric rate of sediment transport are used to develop a methodology to characterize the rate of evolution of the scour hole at nonuniform cylindrical piers. The model also simulates the entire scouring process at nonuniform cylindrical piers having the discontinuous surface located below the initial bed level. The scouring process includes three zones; viz Zone 1 having the scouring phenomenon similar to that of a uniform pier, Zone 2 in which the scour depth remains unchanged with its value equal to the depth of the top level of foundation below the initial bed level while the dimensions of the scour hole increase, and in Zone 3 the geometry pier foundation influences the scouring process. A concept of superposition using an effective pier diameter is proposed to simulate the scouring process in Zone 3. In addition, the laboratory experiments were conducted to utilize the laboratory results for the validation of the model. The simulated results obtained from the proposed model are in good agreement with the present experimental results and also other experimental data. Also, the effect of unsteadiness of flow is incorporated in the model and the results of the model are compared with the experimental data. The model agrees satisfactorily with the experimental data.
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      Temporal Variation of Scour Depth at Nonuniform Cylindrical Piers

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    http://yetl.yabesh.ir/yetl1/handle/yetl/64107
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    contributor authorJau-Yau Lu
    contributor authorZhong-Zhi Shi
    contributor authorJian-Hao Hong
    contributor authorJun-Ji Lee
    contributor authorRajkumar V. Raikar
    date accessioned2017-05-08T21:50:55Z
    date available2017-05-08T21:50:55Z
    date copyrightJanuary 2011
    date issued2011
    identifier other%28asce%29hy%2E1943-7900%2E0000295.pdf
    identifier urihttp://yetl.yabesh.ir/yetl/handle/yetl/64107
    description abstractThe paper proposes a semiempirical model to estimate the temporal development of scour depth at cylindrical piers with unexposed foundations. A cylindrical pier with a foundation is considered as nonuniform pier. The concept of primary vortex and the principle of volumetric rate of sediment transport are used to develop a methodology to characterize the rate of evolution of the scour hole at nonuniform cylindrical piers. The model also simulates the entire scouring process at nonuniform cylindrical piers having the discontinuous surface located below the initial bed level. The scouring process includes three zones; viz Zone 1 having the scouring phenomenon similar to that of a uniform pier, Zone 2 in which the scour depth remains unchanged with its value equal to the depth of the top level of foundation below the initial bed level while the dimensions of the scour hole increase, and in Zone 3 the geometry pier foundation influences the scouring process. A concept of superposition using an effective pier diameter is proposed to simulate the scouring process in Zone 3. In addition, the laboratory experiments were conducted to utilize the laboratory results for the validation of the model. The simulated results obtained from the proposed model are in good agreement with the present experimental results and also other experimental data. Also, the effect of unsteadiness of flow is incorporated in the model and the results of the model are compared with the experimental data. The model agrees satisfactorily with the experimental data.
    publisherAmerican Society of Civil Engineers
    titleTemporal Variation of Scour Depth at Nonuniform Cylindrical Piers
    typeJournal Paper
    journal volume137
    journal issue1
    journal titleJournal of Hydraulic Engineering
    identifier doi10.1061/(ASCE)HY.1943-7900.0000272
    treeJournal of Hydraulic Engineering:;2011:;Volume ( 137 ):;issue: 001
    contenttypeFulltext
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