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首页> 外文期刊>Geosciences >Ground-Penetrating Radar Study of Progradational Units in Holocene Coastal Plains: Carchuna Beach (SE Spain)
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Ground-Penetrating Radar Study of Progradational Units in Holocene Coastal Plains: Carchuna Beach (SE Spain)

机译：全新叶沿海平原促成单位的地面渗透雷达研究：Carchuna海滩（SE SET）

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摘要

The internal geometries of progradational units on the coastal plain in southeastern Spain (Carchuna Beach, Granada) since the maximum Holocene marine transgression (ca. 7000 cal BP) have been analysed using ground-penetrating radar (GPR). Radargram analysis shows the presence of sedimentary structures consistent with the progradation of coastal plains, interpreted as laminations associated with the foreset and topset. Laterally, five middle scale progradational units (H2, H3, H4, H5 and H6) are identified. Each of these units can be grouped into two major units. The general trend towards progradation is interrupted at the boundary of the units. Minor scale units (prograding wedges), deposited at topographically lower areas, are detected in GPR profiles. The radargrams also show channel erosional surfaces and sigmoidal landward dipping reflections interpreted as washover channel deposits, with the erosion and transference of sediments between the beach and the back-ridge domain. Furthermore, the saturation of coastline sediments with saltwater rapidly attenuates the GPR signal. Thus, the GPR is also a good tool to detect saltwater intrusions in shallow aquifers.
机译：自渗透雷达（GPR）已经分析了西班牙东南部（Carchuna Beach，Granada）沿海平原上沿海平原沿海平原的内部几何形状。 Radargram分析表明，沉积结构的存在与沿海平原的促成一致，解释为与前提和拓扑相关的叠片。横向地，鉴定了五种中尺度的促进单位（H2，H3，H4，H5和H6）。这些单元中的每一个都可以分为两个主要单位。在单位的边界中，促进的一般趋势被中断。在GPR型材中检测在拓扑下较低区域的小刻度单元（促进楔形）检测。 Radargrams还展示了渠道侵蚀表面和被解释为盥洗通道沉积物的僵化陆地浸渍反射，海滩与后脊结构域之间的沉积物的侵蚀和转移。此外，海岸线沉积物的饱和迅速衰减了GPR信号。因此，GPR也是一种良好的工具，用于检测浅含水层中的咸水入侵。

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