外文翻译---CCHE1D渠道网络模型的灵敏度分析.docxVIP

附 录附录一：外文原文Sensitivity Analysis of the CCHE1D Channel Network Model Weiming Wu (1), Dalmo A. Vieira (2), Abdul Khan (3) and Sam S. Y. Wang (4) (1), (2), (3) and (4), National Center for Computational Hydroscience and Engineering, School of Engineering, The University of Mississippi, MS 38677; PH (662) 915-5673 / (662) 915-7788; FAX (662) 915-7796; E-mail: mailto:wuwm@ncche.olemiss.eduwuwm@ncche.olemiss.edu AbstractThe CCHE1D model was designed to simulate long-term flow and sediment transport in channel networks to support the DEC project. It uses either the dynamic wave or the diffusive wave model to compute unsteady flows in channel networks with compound cross sections, taking into account the effects of in-stream hydraulic structures, such as culverts, weirs, drop structures, and bridge crossings. It simulates non-uniform sediment transport using a non-equilibrium approach, and calculates bank toe erosion and mass failure due to channel incision. The CCHE1D model decouples the flow and sediment transport calculations but couples the calculations of non-uniform sediment transport, bed changes and bed material sorting in order to enhance the numerical stability of the model. In this paper, the sensitivity of CCHE1D to parameters such as the non-equilibrium adaptation length of sediment transport and the mixing layer thickness is evaluated in cases of channel aggradation and degradation in laboratory flumes as well as in a natural channel network. In the case of channel degradation, the simulated scour process is not sensitive to variation in values of the non-equilibrium adaptation length, but the determination of the mixing layer thickness is important to the computations of the equilibrium scour depth and of the bed-material size distribution at the armoring layer. The simulated bed profiles in the case of channel aggradation and the calculated sediment yield in the case of natural channel network are insensitive to the prescription of both the non-equilibrium