| 输沙能力模式在坡面非恒定输沙过程中的应用 |
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| 引用本文： | 陈界仁,曹淼.输沙能力模式在坡面非恒定输沙过程中的应用[J].水科学进展,2003,14(6):696-699. |
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| 作者姓名： | 陈界仁 曹淼 |
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| 作者单位： | 河海大学水资源环境学院, 江苏, 南京, 210098 |
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| 基金项目： | 水利部科技创新基金项目(SCX2002 08)，河海大学科技创新基金项目(402061) |
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| 摘 要： | 在坡面土壤侵蚀输沙计算中,可选用的输沙能力模式较多,但这些模式多运用于恒定输沙,在非恒定输沙中运用不多。建立了坡面土壤侵蚀非恒定输沙数学模型,模型中的输沙能力运用水流切应力、水流功率、单位水流功率3种模式,对模型过程采用有限差分格式离散求解。根据实测水沙资料进行模型参数率定,运用3种输沙能力模式于不同降雨强度、不同坡度的非恒定坡面输沙过程中。结果表明:在坡面非恒定输沙计算中,不同输沙能力模式对计算结果有明显影响,在降雨强度较小时,单位水流功率模式结果较其他两个模式为好,而在雨强较大时,切应力模式计算结果较好。
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| 关 键 词： | 输沙能力 非恒定输沙 切应力 水流功率 单位水流功率 |
| 文章编号： | 1001-6791(2003)06-696-04 |
| 收稿时间： | 2002-09-17 |
| 修稿时间： | 2002年9月17日 |
Application of the sediment transport capacity models to unsteady sediment transport from overland flow |
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| CHEN Jie-ren,CAO Miao.Application of the sediment transport capacity models to unsteady sediment transport from overland flow[J].Advances in Water Science,2003,14(6):696-699. |
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| Authors: | CHEN Jie-ren CAO Miao |
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| Institution: | College of Water Resources and Environment, Hohai University, Nanjing 210098, China |
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| Abstract: | There are some sediment transport capacity model for soil erosion and transport from overland flow.These sediment transport rate are used in steady sediment transport.The soil erosion and sediment transport model for overland flow is developed in the paper.The physical-based sediment transport equations are derived from the assumption that the sediment transport capacity can be determined by a dominant variable such as flow discharge,flow velocity, shear stress,stream power,unit stream power.The coefficients of the model are computed by experimental data.The sediment transport capacity models are applied to different rainfall intensity and slope.The results indicate that the unit stream power model gives better simulation sediment loadfor small rainfall intensity.The shear stress model simulates sediment load more satisfactorily for large rainfall intensity. |
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| Keywords: | sediment transport capacity unsteady sediment transport shear stress stream power unit stream power |
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