Investigating thickness and internal structure of alpine mires using conventional and geophysical techniques
Investigating thickness and internal structure of alpine mires using conventional and geophysical techniques
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DOI：
10.1016/j.catena.2009.11.006
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发表时间：
2010-03
期刊：
影响因子：
6.2
通讯作者：
O. Sass;Arne Friedmann;G. Haselwanter;Karl-Friedrich Wetzel
中科院分区：
文献类型：
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作者：
O. Sass;Arne Friedmann;G. Haselwanter;Karl-Friedrich Wetzel
我们调查了蒂罗尔州（奥地利）的五个小高山沼泽的厚度和组成，执行传统技术（望远镜杆，钻孔）和地球物理方法相结合。使用100和200 MHz天线进行了GPR调查。地电剖面补充了两个地点的探地雷达;二维勘测通过额外的一维剖面得到加强。目的是获得有关沼泽厚度的数据，交叉检查方法并找到五个地点表现不同的原因。这些调查有助于确立今后的保护概念。沼泽的形成历史可能可以追溯到全新世早期。三个较大的沼泽是陆地化沼泽，而两个沼泽是沼泽化形成的。用金属棒进行探测，在两个方向上都会因障碍物和松软的底层而产生相当大的误差。因此，地质雷达被证明是一个有利的补充，以传统的深度评估。在五个站点中的四个站点，探地雷达可以高精度地描绘沼泽的基层，而检测泥炭内部界面则不太成功。2D电阻率剖面加上1D建模提供了关于泥底和更深地下的极好的额外信息;在一个矿物质被冲刷的地点，2D电阻率被证明是比GPR更好的选择。
We investigated the thickness and composition of five small alpine mires in Tyrol (Austria), performing a combination of conventional techniques (telescope rods, drilling) and geophysical methods. GPR surveys were carried out using 100 and 200MHz antennas. Geoelectrical profiles supplemented the GPR at two sites; the 2D-surveys were enhanced by additional 1D-profiling. The aim was to achieve data on mire thickness, to cross-check the methods and to find reasons for different performance at the five sites. The investigations contribute to establishing a future protection concept. The formation history of the mires probably goes back to the early Holocene. The three larger mires are terrestrialisation mires, while two mires are formed by paludification. Probing with a metal rod was subject to considerable errors in both directions caused by obstacles and soft underlying layers. Thus, GPR proved to be a favourable addition to conventional depth assessment. At four of five sites, GPR made it possible to depict the base layer of the mires at a high accuracy, while detecting peat internal interfaces was less successful. 2D-resistivity profiling supplemented with 1D-modelling provided excellent additional information on mire base and deeper subsurface; at one site where minerogenic material is washed in, 2D-resistivity proved to be the better choice compared to GPR.