000K  utf8
1100  2024$c2024-09-19
1500  eng
2051  10.57892/100-84
3000  Corradini, Erica
3010  Erkul, Ercan
3010  Panning, Diana
3010  Pickartz, Natalie
3010  Rabbel, Wolfgang
3010  Thorwart, Martin
3010  Wilken, Dennis
3010  Wunderlich, Tina
4209  We present an integrated approach of multi-method geophysical sounding and local soil sampling for differentiate, and map organic sediments. Our study is based on ground-penetrating radar (GPR), electrical resistivity tomography (ERT) and shear-wave seismic (SH seismic) profiling applied to sediments of the former Lake Duvensee (northern Germany), nowadays a bog. The bog is embedded in low conductive glacial sand and is characterized by layers of different gyttja sediments (detritus and calcareous). The present study was conducted in order to identify the bog morphology and the thickness of the peat body and lake sediments, in order to understand the basin evolution. To validate the geophysical results, derived from surface measurements, drilling, soil analyses as well as borehole guided wave analysis of electromagnetic waves and Direct-Push (DP-EC) have been carried out and used for comparison. It turned out that each method can distinguish between sediments that differ in grain size, particularly between peat, lake sediments (gyttjas and mud) and basal glacial sand deposits. GPR is even able to separate between strongly and weakly decomposed peat layers, which is also clear considering resistivity variations in the ERT computation. From the association between geophysical properties and sediment analysis (e.g., water content and organic matter) different gyttjas were distinguished (coarse and fine) and seismic velocity was correlated to bulk density. Moreover, GPR and SH-wave seismics present different resolutions, confirming that the latter allows measurements, which are more focused on determining the extension of basal sand deposits, the depth of which is diffcult to reach with GPR. Representative values of electrical resistivity, dielectric permittivity, and shear wave velocity have been determined for each sediment type and are therefore available to complete the investigation of wetland environments. Fine grained lake sediments were diffcult to differentiate by the applied methods.
4950  https://doi.org/10.57892/100-84$xR$3Volltext$534
4961  https://opendata.uni-kiel.de/receive/fdr_mods_00000084
5051  550
5550  Archäologische Prospektion
5550  Electrical Resistivity Tomography
5550  Ground Penetrating Radar
5550  Probenahme
5550  Seismic