Flood Suspended Sediment Transport: Combined Modelling from Dilute to Hyper-concentrated Flow

Jaan H. Pu, Joseph T. Wallwork , Md. Amir Khan , Manish Pandey , Hanif Pourshahbaz , Alfrendo Satyanaga, Prashanth R. Hanmaiahgari , Tim Gough

Research output: Contribution to journalArticlepeer-review

Abstract

During flooding, the suspended sediment transport usually experiences a wide-range of dilute to hyper-concentrated suspended sediment transport depending on the local ground conditions. This paper assesses the distribution of sediment for a variety of hyper-concentrated and dilute flows. Due to the complex differences between hyper-concentrated and dilute flows, a linear-power coupled model is proposed to integrate these considerations. A parameterised method combining the sediment size, Rouse number, mean concentration and flow depth parameters has been used for modelling the sediment profile. The accuracy of the proposed model has been verified against reported laboratory measurements and comparison with other published analytical methods. The proposed method has been shown to effectively compute the concentration profile for a wide range of suspended sediment conditions from hyper-concentrated to dilute flows. Detailed comparisons reveal that the proposed model calculates the dilute profile with good correspondence to measured data and other modelling results from literature. For the hyper-concentrated profile, a clear division of lower (bed-load) to upper layer (suspended-load) transport can be observed in the measured data. Using the proposed model, the transitional point from this lower to upper layer transport can be calculated precisely.
Original languageEnglish
JournalWater (Switzerland)
Publication statusAccepted/In press - 2021

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