JAMP  Vol.4 No.4 , April 2016
Numerical Investigation on Downstream Increase in Peak Discharge of Hyperconcentrated Floods in the Lower Yellow River

Hyperconcentrated floods in the Yellow River usually accompanied with some peculiar phenomena that cannot be explained by general conceptions of ordinary sediment-laden flow (e.g., downstream increase in peak discharge, instability flow, ripping up the bottom). Up to date, the mechanisms for the abnormal phenomena are not well understood. The aim of this paper is to facilitate a new insight into the abnormal downstream increase in peak discharge of hyperconcentrated floods in the lower Yellow River. Numerical model experiments have been conducted on a typical flood occurred in August 1992 in the Lower Yellow River during which the peak discharge at Huayuankou station was 1690 m3/s larger than the value at Xiaolangdi station at upstream. It is found that a fully coupled model that incorporates the contribution of bed evolution to the mass conservation of the water-sediment mixture, can reasonably well capture the characteristics of peak discharge rise and severe bed scour, while separate numerical experiment using a decoupled model, which ignores the feedback effects of bed evolution, shows no rise in the peak discharge. This leads us to comment, if only briefly, that the entrainment of sediment due to bed erosion is the main reason for causing peak discharge increase along downstream course.

Cite this paper: Li, Z. , Jin, Z. (2016) Numerical Investigation on Downstream Increase in Peak Discharge of Hyperconcentrated Floods in the Lower Yellow River. Journal of Applied Mathematics and Physics, 4, 641-647. doi: 10.4236/jamp.2016.44073.

[1]   Zhang, R. and Xie, J. (1993) Sedimentation Research in China: Systematic Selections. China Water and Power Press, Beijing.

[2]   Chien, N., Wan, Z., Qian, N. and Quian, N. (1999) Mechanics of Sediment Transport. ASCE Press, Reston.

[3]   van Maren, D., Winterwerp, J., Wu, B. and Zhou, J. (2009) Modelling Hyperconcentrated Flow in the Yellow River. Earth Surface Processes and Landforms, 34, 596-612.

[4]   Xu, J.X. (1999) Erosion Caused by Hyperconcentrated Flow on the Loess Plateau of China. Catena, 36, 1-19.

[5]   Wan, Z. and Wang, Z. (1994) Hyperconcentrated Flow. Balkema, Rotterdam.

[6]   Qi, P. and Li, W.X. (1996) Evolutional Characteristics of Hyper-Concentrated Flow in Braided Channel of the Yellow River. International Journal of Sediment Research, 11, 9.

[7]   Wang, Z., Qi, P. and Melching, C. (2009) Fluvial Hydraulics of Hyperconcentrated Floods in Chinese Rivers. Earth Surface Processes and Landforms, 34.

[8]   Toro, E.F. (2001) Shock-Capturing Methods for Free-Surface Shallow Flows. Wiley, Chichester.

[9]   Cao, Z.X., Pender, G. and Carling, P. (2006) Shallow Water Hydrodynamic Models for Hyperconcentrated Sediment- Laden Floods over Erodible Bed. Advances in Water Resources, 29, 546-557.

[10]   Shu, A. and Fei, X. (2008) Sediment Transport Capacity of Hyperconcentrated Flow. Science in China Series G: Physics Mechanics and Astronomy, 51, 961-975.

[11]   Winterwerp, J., Bakker, W., Mastbergen, D. and Van Rossum, H. (1992) Hyperconcentrated Sand-Water Mixture Flows over Erodible Bed. Journal of Hydraulic Engineering—New York, 118, 1508-1508.

[12]   Guo, J. (2002) Logarithmic matching and its applications in computational hydraulics and sediment transport Accordement logarithmique et applications en hydrau-lique numérique et en sédimentation. Journal of Hydraulic Research, 40, 555.

[13]   Einstein, H. (1950) The Bed-Load Function for Sediment Trans-portation in Open Channel Flows. Water Resources Building, 43.

[14]   Guo, J. and Julien, P. (2004) Efficient Algorithm for Computing Einstein Integrals. Journal of Hydraulic Engineering, 130, 1198.

[15]   Guo, Q.C., Hu, C.H., Takeuchi, K., Ishidaira, H., Cao, W.H. and Mao, J.X. (2008) Numerical Modeling of Hyper- Concentrated Sediment Transport in the Lower Yellow River. Journal of Hydraulic Research, 46, 659-667.

[16]   Ni, J., Zhang, H., Xue, A., Wieprecht, S. and Borthwick, A. (2004) Modeling of Hyperconcentrated Sediment-Laden Floods in Lower Yellow River. Journal of Hydraulic Engineering, 130, 1025.