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The 2-D water and sediment mathematical model which reflects silting in floodplain and scouting in main channel of over-bank flooding in the Lower Yellow River has been set up in this paper. Through carrying on 2-D water and sediment numerical simulation of the “96.8” typical flood, the author studied influence of over-bank flooding on flood travel and transverse exchange. The primary simulation results show that, adopting the over-bank flooding for silting in floodplain and scouting in main channel effectively guaranteed and expanded transverse exchange between floodplain and main channel and maintained the river channel vigor. This can relieve “secondary suspended river” states in the Low Yellow River to a certain extent; at the same time, the different magnitudes of over-bank floods have different effect of silting in floodplain and scouting in main channel.

Since the General Channel designed for the South-to-North Water Transfer Project in China has to cross many rivers and streams flowing from west to east, there are potentially serious effects additional flooding on the western side of the project alignment. Therefore, a 2-D numerical model for forecasting basin flood disasters was established and verified using historical flood data. The model was applied to researching the interaction between the proposed Project and flooding events for 5 streams in the Anyang River reach as a representative case study. Simulated results indicate that the model could correctly forecast the flood, submerged area and depths, and water surface elevations along the left side of the channel. The discharge capacity and location of hydraulic structures in the transfer canal alignment were analyzed. Then adjustments to the dimensions and positioning of proposed hydraulic structures were recommended at intersections, especially the addition of a channel to transfer flood water from one stream to another, which can effectively limit the sluice and protect the Anyang City from flooding.

Numerical seepage model of tailing dam based on finite-element method is established. By constructing special grid system and intermediate boundary conditions, combined drain seepage system (horizontal drain pipe + transverse- longitudinal blind drainage ditch) is well achieved in the model and the results of model analysis are verified by the results of experiments. Through the numerical simulation of the seepage in the tailing pond, seepage velocity field and seepage surface and water head distribution in both the transverse and longitudinal directions in different filling period and different drain seepage conditions have given. Analysis shows that water head change in slag accumulative area is relatively small and the local seepage slope is big in the dam-toe in the initial stage. As the increase of the filling height, the seepage slope increases correspondingly. The changing of the seepage field in three drain-seepage conditions is analyzed. After setting the combined drain seepage system, the seepage face is basically distributed along the drainage pipe. The seepage slope reduces obviously and meets requirements of the dam stability.