| 吴志伟,宋汉周.基于全局灵敏度分析的大坝温度场影响因子探讨[J].水利学报,2011,42(6): |
| 基于全局灵敏度分析的大坝温度场影响因子探讨 |
| Determination of impact factors on temperature field in dam based on global sensitivity analysis method |
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| DOI： |
| 中文关键词: 大坝温度场 局部灵敏度 全局灵敏度 数值计算 |
| 英文关键词: temperature field in dam local sensitivity global sensitivity numerical calculation |
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| 中文摘要: |
| 运行期大坝温度场与渗流场耦合数学模型包含诸多参数，采用灵敏度分析方法能确定大坝温度场的主要影响因子，从而减小模型校正的工作量，为相关研究提供借鉴。基于大坝热-流耦合稳态模型，对大坝温度场分别做了局部灵敏度分析和全局灵敏度分析。分析结果表明，大坝温度场对上游水库库底温度和下游坝面温度较灵敏，其余参数的灵敏度顺序依次为水力梯度、渗透率、岩石热导系数、孔隙率和介质比热。实例分析结果也证实全局灵敏度分析能用来定量研究参数间共同作用对数值模型的影响。 |
| 英文摘要: |
| Coupled model of temperature field and seepage field in dam contains many parameters under operation. Sensitivity analysis method can be used to determine the main impact factors，which is able to reduce workload of model calibration. Based on a steady heat-fluid coupled model，both local sensitivity analysis and global sensitivity analysis were carried out. A case study is taken as an example. The results show that，the temperatures at the bottom of a reservoir and on the downstream dam surface are most significant factors and others are in the sequence of apparent hydraulic gradient，specific permeability，and conductive coefficient of medium，factor of porosity and heat capacity. It also shows that the global sensitivity has advantages in analyzing interactions among parameters. |
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