Characterization of karst hazards from the perspective of the doline triangle using GPR — Examples from Central Ebro Basin (Spain)
Characterization of karst hazards from the perspective of the doline triangle using GPR — Examples from Central Ebro Basin (Spain)
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DOI：
10.1016/j.enggeo.2009.06.022
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发表时间：
2009-10
影响因子：
7.4
通讯作者：
O. Pueyo-Anchuela;M. Juan;A. Casas‐Sainz
中科院分区：
文献类型：
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作者：
O. Pueyo-Anchuela;M. Juan;A. Casas‐Sainz
探地雷达（GroundPenetratingRadar，GPR）是一种广泛应用于岩溶灾害（洞穴和古塌陷）定位和探测的技术.在本文中，我们表明，从GPR调查获得的沉积物的内部结构也可以作为一个活跃的岩溶过程的指标。提出了在探地雷达-漏斗三角区应用探地雷达对岩溶灾害问题进行分类的方法，该三角区有三个端元：空洞、沉降证据和古塌陷。这些末端成员在GPR分布图中显示特定的签名。本文所示的实例表明，地质雷达测量是一种地球物理技术，提供了一个非常高的分辨率，并提供结构和沉积信息的底土。使用根据探地雷达数据制作的网格图是确定异常扇区（电磁特性的横向变化、不同反射率和定性穿透深度变化或速度波传播变化）的有效方法。它们与从GPR剖面获得的结构特征（上搭接几何形状、具有凹陷反射体的区域、折叠反射体或横向突变结构限制）的关系可用作岩溶过程的指标。
Ground Penetrating Radar (GPR) is a widespread technique to locate and characterise karst hazards (cavities and paleocollapses). In this paper, we show that the internal structure of sediments obtained from GPR surveys can also be used as an indicator of active karst processes. A classification of karst hazard problems by means of GPR in the GPR-doline triangle is proposed, with three end-members: cavities, evidences of subsidence and paleocollapses. These end members show particular signatures in the GPR-profiles. The field examples shown in this paper indicate that GPR survey is a geophysical technique that offers a very high resolution and provides structural and sedimentological information of the subsoil. The use of grid maps, elaborated from GPR data, is an efficient way to determine anomalous sectors (lateral changes of electromagnetic properties, different reflectivity and qualitative penetration depth variations or velocity wave propagation changes). Their relationships with the structural features obtained from GPR-profiles (on-lap geometries, zones with depressed reflectors, folded reflectors or laterally abrupt structural limits) can be used as indicators of karstic processes.