| 水库冰气泡含量和密度对探地雷达测厚的影响分析(英文) |
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| 引用本文： | 李志军,贾青,张宝森,Lepporanta,Matti,卢鹏,黄文峰.水库冰气泡含量和密度对探地雷达测厚的影响分析(英文)[J].应用地球物理,2010,7(2):105-113. |
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| 作者姓名： | 李志军 贾青 张宝森 Lepporanta Matti 卢鹏 黄文峰 |
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| 作者单位： | |
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| 基金项目： | supported by the National Natural Science Foundation of China(Grant No50879008,40930848); the Open Fund of State Key Laboratory of Frozen Soil Engineering(Grant No SKLFSE200904) |
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| 摘 要： | 在水库现场试验了RIS K2型探地雷达探测水库冰厚度的能力,试验时所用天线频率为600MHz;同步钻孔测量雷达探测处的冰厚度;以及在一个点上取样测试分析冰晶体、冰内气泡和冰密度。试验时冰面积雪厚度0.03-0.05m,冰层上部有0.24m粒状冰,其下均为柱状冰;冰内气泡含量呈表层高底层低分布;冰密度随气泡含量变化;冰厚度在平面内不均一。通过探测厚度和实测厚度的对比分析以及气泡含量对介电系数影响的理论分析,建立了积雪、粒状冰和柱状冰三层介质模型,获取雷达波在冰内的理论传递时间。结果发现:能够利用等效介电常数或等效传播速度评价雷达波传递时间,结冰期冰层1/3深度处的对应介电常数或传递速度可以作为等效值;另外因冰内大气泡造成的理论传递时间大于雷达探测时间,其差值随理论传递时间或冰厚的增加呈非线性增加。
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| 关 键 词： | 雷达 水库冰 厚度 探测 误差 |
| 收稿时间： | 22 April 2004 |
Influences of gas bubble and ice density on ice thickness measurement by GPR |
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| Zhi-Jun?Li,Qing?Jia,Bao-Sen?Zhang,Matti?Lepp?ranta,Peng?Lu,Wen-Feng?Huang.Influences of gas bubble and ice density on ice thickness measurement by GPR[J].Applied Geophysics,2010,7(2):105-113. |
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| Authors: | Zhi-Jun Li Qing Jia Bao-Sen Zhang Matti Leppäranta Peng Lu Wen-Feng Huang |
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| Institution: | Lepp(a)ranta Matti |
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| Abstract: | Lake ice thickness changes with regional hydrometeorology and is closely associated with global climate change. We tested
the detection of ice thickness using ground penetrating radar (GPR) in the Hongqipao reservoir. Ice crystals, gas bubbles,
ice density and ice thickness were also determined by concurrently drilling for validation. During the tests the gas bubble
content was high in the upper and low in the bottom, ice density varied with the bubble content, and the ice thickness was
not homogeneous. By comparisons between radar detected and in-situ measured ice thicknesses with theoretical analyses of the
influence of gas bubble content on the dielectric constant, a three-layer model with snow, granular ice, and columnar ice
was established and the transmission speed of radar wave within the ice was determined. Experience reveals that the equivalent
dielectric constant can be used to evaluate the wave speed and the values at 1/3 ice cover depth can be used as equivalent
values. Besides, the difference between the theoretical transmission time and the real detection time induced by large gas
bubbles increases nonlinearly with the theoretical transmission time or ice thickness. |
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| Keywords: | Radar reservoir ice thickness detection error |
| 本文献已被 CNKI 维普 万方数据 SpringerLink 等数据库收录！ |
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