外文翻譯---cche1d渠道網(wǎng)絡(luò)模型的靈敏度分析

1、附 錄附錄一：外文原文 附錄一：外文原文Sensitivity Analysis of the CCHE1D Channel Network ModelWeiming Wu (1), Dalmo A. Vieira (2), Abdul Khan (3) and Sam S. Y. Wang (4) (1), (2), (3) and (4), National Center for Computational Hydroscienc

2、e and Engineering, School of Engineering, The University of Mississippi, MS 38677; PH (662) 915-5673 / (662) 915-7788; FAX (662) 915-7796; E-mail: wuwm@ncche.olemiss.edu AbstractThe CCHE1D model was designed to simulate

3、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

4、, 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 calcu

5、lates 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

6、 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

7、thickness is evaluated in cases of channel aggradation and degradation in successfully tested in various experimental and field cases. Because several parameters in CCHE1D must be prescribed empirically, it is very impor

8、tant to know the response of the model to the uncertainty of these parameters. In this study, the sensitivity of CCHE1D to model parameters such as the non-equilibrium adaptation length of sediment transport and the mixi

9、ng layer thickness is analyzed in cases of channel aggradation and degradation in laboratory flumes as well as in a natural channel network. Description of the CCHE1D Channel Network Model Hydrodynamic Model. The CCHE1

10、D flow model simulates unsteady flow in channel networks with compound cross-sections using either the diffusive wave model or the dynamic wave model. The dynamic wave model solves the full St. Venant equations. The Prei

11、ssmann implicit,four-point, finite difference scheme is used to discretize the governing equations. Linearized iteration schemes for the discretized governing equations are established and solved using a double sweep alg

12、orithm. The influence of hydraulic structures such as culverts, measuring flumes, bridge crossings and drop structures has been considered in the CCHE1D model. Stage-discharge relations for hydraulic structures are deriv

13、ed so that the hydraulic structures become an intrinsic part of the numerical algorithm. Sediment Transport Model. The CCHE1D model calculates non-uniform sediment transport in rivers using a non-equilibrium approach.