Zhang Hong-wu

Spatial integrated analysis on water erosion of Yellow River China

Using remote sensing technology applied to research water erosion introduced firstly, and then choosing such data mining approaches as spatial statistical analysis and spatial cluster analysis to discuss the relationship between water erosion and geologic environment and other factors of Yellow River. The results show in two aspects below. (1) The character of spatial distribution was compared under the condition of different grade elevation, average temperature per year, rainfall and other geographic environment factors. The percentage of water erosion area above heavy under the condition of six-grade elevation (elevation between 1501 and 20000), eight-grade average temperature per year (between 8.1 and 10 centigrade) and five-grade rainfall (between 400.1 and 500 mm) is more than any other geographic environment. (2) On the basis of geographic environment factors, the discrepancy of the region of water erosion of Yellow River was analyzed using spatial cluster analysis, and the water erosion percentage of the fifth type account for most of all these ten regions.

Simulation of suspended load transport based on two-phase mixture model

This paper aims at simulation of suspended load transport through three-dimensional numerical model. Based on the hydrodynamic model of SELFE and two-phase mixture flow, the transport equation is completed and discrete equation with relevant boundary conditions is set up. To verify the new model, different calibration tests are carried, moreover whose results satisfy. Finally, the three-dimensional model is used to study the flood of 2012th year between the Qingtongxia & Shizuishan in Ningxia-Inner Mongolia Yellow River. In addition, this study mainly focuses the character of the flood propagation, circulation features, sediment transport as well as river-bed erosion and deposition. The results reveal that the computed water levels, landform and sediment concentration show good agreement with the measured data. The circulation features are also in accordance with the theoretical analysis. All these indicate that the modified model can effectively simulate the suspended load transport.