| 基于热流变运动学模型的长白山熔岩流数值模拟 |
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| 引用本文： | 潘波,许建东,林旭东,万园,于红梅.基于热流变运动学模型的长白山熔岩流数值模拟[J].地球物理学报,2011,54(9):2317-2324. |
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| 作者姓名： | 潘波 许建东 林旭东 万园 于红梅 |
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| 作者单位： | 中国地震局地质研究所,北京 100029 |
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| 基金项目： | 中国地震局地质研究所基本科研业务专项(IGCEA0902)资助,中国地震局地震行业科研专项(200708-27)资助. |
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| 摘 要： | 热流变运动学模型是熔岩流复杂流动过程模拟的一种方法,其通过热量系统和地形的计算来模拟熔岩流的流动速度、温度变化和流动距离等.本文以气象站期碱流岩的野外调查数据为依据,应用该模型对其进行模拟研究.通过对模拟结果的分析发现,速度变化趋势与地形坡度变化趋势一致,但随着流动过程中黏度的增大,地形影响作用逐渐减小.在热量系统中,...
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| 关 键 词： | 热流变运动学模型 流动速度 辐射热 微晶结晶热 熔岩流灾害区划 |
| 收稿时间： | 2010-05-12 |
Modeling the lava flow of Changbaishan Volcano, China based on kinematic thermo-rheological model |
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| PAN Bo,XU Jian-Dong,LIN Xu-Dong,WAN Yuan,YU Hong-Mei.Modeling the lava flow of Changbaishan Volcano, China based on kinematic thermo-rheological model[J].Chinese Journal of Geophysics,2011,54(9):2317-2324. |
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| Authors: | PAN Bo XU Jian-Dong LIN Xu-Dong WAN Yuan YU Hong-Mei |
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| Institution: | Institute of Geology, China Earthquake Administration, Beijing 100029, China |
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| Abstract: | The kinematic thermo-rheological model is a means of modeling the complicated flowing process of lava flow. The model can be used to determine the flow velocity, temperature variation and flowing distance of the lava flow through the calculation of relief and thermal system. In this paper, the Qixiangzhan period pantellerite lava flow in Changbaishan volcano has been modeled by using this model on the basis of relevant parameters obtained from field investigation on the lava flow. The result of modeling shows that the variation trend of flow velocity is consistent well with the variation trend of topographic slope, but with increasing viscosity during flowing process, the effect of topography becomes less important. In heat budget terms, the radiation heat and crystallization heat of microlites are the most significant heat loss and heat gain in the lava flow, respectively. The final flowing distance of the Qixiangzhan period pantellerite lava flow is calculated by the model to be 5.17 km, approximate to the actual length of 5.4 km. The consistency between the modeling results and geologic observation data indicates the feasibility and reliability of the modeling method. In addition, this study may provide a reference to the geologic study of lava flow, as well as a new train of thought and method of assessing lava flow hazard. |
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| Keywords: | Kinematic thermo-rheological model Flow velocity Radiation heat Crystallization heat of microlites Lava flow hazard zoning |
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