TR-596 insights into the origin and characteristics of the sedimentation process at multi-barrel culverts in Iowa.
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TR-596 insights into the origin and characteristics of the sedimentation process at multi-barrel culverts in Iowa.

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  • Alternative Title:
    Insights into the design and characteristics of the sedimentation process at multi-barrel culverts in Iowa
  • Creators:
  • Corporate Creators:
    Iowa Institute of Hydraulic Research
  • Corporate Contributors:
  • Subject/TRT Terms:
  • Publication/ Report Number:
    IHRB Project TR-596
  • Resource Type:
    Tech Report
  • Geographical Coverage:
    Iowa
  • Edition:
    Final report.
  • Corporate Publisher:
    University of Iowa. IIHR Hydroscience and Engineering
  • Abstract:
    The present study is an integral part of a broader study focused on the design and implementation of self-cleaning culverts, i.e.,

    configurations that prevent the formation of sediment deposits after culvert construction or cleaning. Sediment deposition at culverts is

    influenced by many factors, including the size and characteristics of material of which the channel is composed, the hydraulic

    characteristics generated under different hydrology events, the culvert geometry design, channel transition design, and the vegetation

    around the channel. The multitude of combinations produced by this set of variables makes the investigation of practical situations a

    complex undertaking.

    In addition to the considerations above, the field and analytical observations have revealed flow complexities affecting the flow and

    sediment transport through culverts that further increase the dimensions of the investigation. The flow complexities investigated in this

    study entail: flow non-uniformity in the areas of transition to and from the culvert, flow unsteadiness due to the flood wave propagation

    through the channel, and the asynchronous correlation between the flow and sediment hydrographs resulting from storm events. To

    date, the literature contains no systematic studies on sediment transport through multi-box culverts or investigations on the adverse

    effects of sediment deposition at culverts. Moreover, there is limited knowledge about the non-uniform, unsteady sediment transport in

    channels of variable geometry. Furthermore, there are few readily useable (inexpensive and practical) numerical models that can

    reliably simulate flow and sediment transport in such complex situations.

    Given the current state of knowledge, the main goal of the present study is to investigate the above flow complexities in order to provide

    the needed insights for a series of ongoing culvert studies. The research was phased so that field observations were conducted first to

    understand the culvert behavior in Iowa landscape. Modeling through complementary hydraulic model and numerical experiments was

    subsequently carried out to gain the practical knowledge for the development of the self-cleaning culvert designs.

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