Aimed at the problems about that permeable hole number and permeable hole layout of Permeable Sheet Piling Spur Dike (PSPSD) affecting the flow characteristic at spur dike area, CCHE2D flow simulation mathematical model is adopted, two dimensional flow numerical simulation is carried out for the permeable spur dike area of the physical model of the Qiman reach of the Tarim River main stream. The change law of cross section flow velocity, water level with different permeable hole number and layout are analyzed. The optimization scheme of permeable hole for the PSPSD is sought. The results show that the more number of permeable hole of the PSPSD, the higher the water level upstream of the spur dike, the lower the water level downstream of the spur dike, the smaller the flow velocity upstream and downstream of the spur dike, the better the velocity uniformity. The optimization scheme for the permeable spur dike with the best effect of flow retardation is that the number of permeable holes is 4 holes, and the spacing of permeable hole decreases gradually from the root to the head of the spur dike, which accounts for 9%, 8%, 7% and 6% of the length of the PSPSD respectively.

This paper takes the Tarim River as an example to study selection of Manning's roughness coefficient (n) in numerical simulation and presents a new method for calibrating Manning's roughness coefficient of flume model. The measured topographic data and hydraulic data obtained from the flume experiments are taken as the initial boundary conditions in flow simulation, and n value for flume model of the Qiman reach of Tarim River is calibrated by using CCHE2D model. The consistency between the simulated water surface and the measured water surface with different n value is compared by using error analysis method. Manning's n value for flume model which meets the minimum error requirements is determined. The relative error between n value obtained by the empirical method and n value obtained by the numerical simulation method is analyzed. The result shows that the calibration method of n value for flume model by using CCHE2D model and error analysis presented in this paper is feasible and reliable.

6m arch board used as test object, this paper introduces the arch in different level of load board cracks, development and production of plastic hinge until the whole process for all the damage simulation numerical simulation analysis then compared with experimental results and analysis of increased with load crack distribution, which can be used to understand the similar in service work condition of the stone bridge.

In this study, sediment transport at the third entrance of the Xinqiman Reservoir in the Tarim River was simulated using the CCHE2D model. The flow conditions, the suspended sediment concentration of each grain size, and the boundary grain size of the wash load in the reach were determined. Regressions between the suspended sediment concentration, S, and flow condition, U3/gH, and flow-sediment factor, U3/Rω, were developed, which strongly adhered to the power law and Zhang Ruijin’s formula for the sediment transport capacity. The parameters in Zhang Ruijin’s formula for the target reach were determined. Under the defined flow and sediment conditions, sediment particles ≥0.091 mm and particles ≤0.061 can be regarded as the bed material and wash loads, respectively. Using multivariate linear regression, the sediment transport capacity coefficient (k0) and exponent (m) were determined to be 0.0197 and 0.928, respectively. These results can serve as an important theoretical reference for the calculation of sediment transport at the third entrance of the Xinqiman Reservoir in the Tarim River.