Direct-Push-Technologien – Effiziente Untersuchungsmethoden für die Untergrunderkundung

Leven, Carsten; Weiß, Hans-Jörg; Vienken, Thomas; Dietrich, Peter

doi:10.1007/s00767-011-0175-8

Cited by 37 publications

(7 citation statements)

References 105 publications

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“…Die oberflächengeophysikalischen Messungen dienen somit hauptsächlich dazu, verschiedene strukturelle Einheiten mit kontrastierenden Eigenschaften voneinander abzugrenzen und passende Ansatzpunkte für eine Validierung durch In-situ-Messungen oder Kernbohrungen zu bestimmen (Schelenz et al 2017;Utom et al 2019;Klingler et al 2020b). In der vorliegenden Studie wurden die In-situ-Messungen mit Direct-Pushund bohrlochgeophysikalischen Sonden durchgeführt, die im Vergleich zu Kernbohrungen eine sehr genaue Tiefenzuordnung ermöglichen, da keine Kernverluste auftreten können (Fejes et al 1997;McCall et al 2005;Dietrich und Leven 2009;Leven et al 2011).…”

Section: Methodenunclassified

Kombination geophysikalischer und hydrogeologischer Methoden zur gezielten Erkundung feinkörniger Talfüllungen

Klingler

Martin

Cirpka

et al. 2021

Grundwasser - Zeitschrift der Fachsektion Hydrogeologie

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KurzfassungSedimentäre Strukturen können die Fließ- und Stofftransportpfade in feinkörnigen Talfüllungen stark beeinflussen. Diese Strukturen müssen gezielt auf ihre Ausdehnung und Eigenschaften untersucht werden, um Verweilzeiten, Fließpfade und das Abbaupotenzial eingetragener Schadstoffe zu bestimmen. In der quartären Talfüllung der Ammeraue bei Tübingen wurden beispielhaft Torflagen und eine Kiesrinne untersucht, um ihre Einflüsse auf die regionale Hydrogeologie und Hydrochemie zu bewerten. Dafür wurden geophysikalische und hydrogeologische Erkundungsmethoden ausgewählt und kombiniert. Mit geoelektrischen Oberflächenmessungen konnte die Ausdehnung der betrachteten Strukturen erkundet werden. Unterschiedliche Direct-Push-Sondierungen, darunter eine In-situ-Bestimmung der Sedimentfarbe, und bohrlochgeophysikalische Messungen erfassten ihre Geometrie und interne Heterogenität. Die hydraulischen und biogeochemischen Eigenschaften der Sedimente und des Grundwassers wurden anschließend durch gezielte Probennahmen und hydraulische Tests an repräsentativen Ansatzpunkten bestimmt. Die dargestellte Methodenkombination zur Abgrenzung relevanter Teilgebiete mit anschließender hochauflösender Untersuchung lässt sich auch auf die Untersuchung großflächiger Täler übertragen.

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Section: Methodenunclassified

Kombination geophysikalischer und hydrogeologischer Methoden zur gezielten Erkundung feinkörniger Talfüllungen

Klingler

Martin

Cirpka

et al. 2021

Grundwasser - Zeitschrift der Fachsektion Hydrogeologie

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“…This is especially the case for applications, which require the general advantages of direct push platforms (Dietrich and Leven 2006;Leven et al 2011;McCall et al 2005) and high data acquisition accuracy, as assembled in the CLT. Since the classical approaches require ex situ access to the soil sample, e.g., via coring or digging-performing in situ measurements-CLT enlarges the tool box for field application.…”

Section: Discussionmentioning

confidence: 97%

“…High-resolution data are measured by a broad variety of sensors and probes (Dietrich and Leven 2006;Leven et al 2011;McCall et al 2005). Considering small-scale variability, experience of using direct push applications has shown that measured, sample, and log data are reproducible (Leven et al 2011). The most common application of DPT is the recording of vertical profiles (Dietrich and Leven 2006).…”

Section: Introductionmentioning

confidence: 99%

Technique, analysis routines, and application of direct push-driven in situ color logging

et al. 2016

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Color data are a useful proxy for soil/sediment parameterization since they reflect material characteristics. We introduce direct push color logging for real-time and depth-resolved, in situ colorimetric record of colors in unconsolidated sediments in terrestrial environments. Until now, no routines exist on how to handle highly resolved (mmscale) data. To develop such routine, we transform colorimetric data (CIEXYZ) into color surrogates of selected color. We obtain interpretable color logs over depth by filtering with Haar and Daublet4 wavelet functions. We verify the approach, according to repeatability of in situ sediment color measurements, with related lithological determination gathered by state-of-the-art direct push-based cone penetration testing and soil sampling data. The developed routine is appropriate for unambiguous transformation of color data into interpretable color surrogates and filtering small-scale variability. We observe that soil color logs are repeatable and proved to correlate with lithological/chemical changes. Thus, the technique allows enhanced profiling by means of providing a reproducible high-resolution parameter for analysis of soil/ sediment characteristics. This opens potential new areas of application and new outputs for in situ-obtained colorimetric data in and beyond geotechnical site characterization.

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“…Direct push sensing is a minimally invasive and depth‐accurate technique for in situ characterization of sediment stratigraphies (Dietrich and Leven, 2009; Leven et al ., 2011). A caterpillar pushes small‐diameter steel rods into the ground using various probes.…”

Section: Methodsmentioning

confidence: 99%

Sediment budgeting of short‐term backfilling processes: The erosional collapse of a Carolingian canal construction

Schmidt

Werther

Rabiger-Völlmer

et al. 2020

Earth Surf Processes Landf

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Sediment budgeting concepts serve as quantification tools to decipher the erosion and accumulation processes within a catchment and help to understand these relocation processes through time. While sediment budgets are widely used in geomorphological catchment-based studies, such quantification approaches are rarely applied in geoarchaeological studies. The case of Charlemagne's summit canal (also known as Fossa Carolina) and its erosional collapse provides an example for which we can use this geomorphological concept and understand the abandonment of the Carolingian construction site. The Fossa Carolina is one of the largest hydro-engineering projects in Medieval Europe. It is situated in Southern Franconia (48.9876°N, 10.9267°E; Bavaria, southern Germany) between the Altmühl and Swabian Rezat rivers. It should have bridged the Central European watershed and connected the Rhine-Main and Danube river systems. According to our dendrochronological analyses and historical sources, the excavation and construction of the Carolingian canal took place in AD 792 and 793. Contemporary written sources describe an intense backfill of excavated sediment in autumn AD 793. This short-term erosion event has been proposed as the principal reason for the collapse and abandonment of the hydro-engineering project. We use subsurface data (drillings, archaeological excavations, and direct-push sensing) and geospatial data (a LiDAR digital terrain model (DTM), a pre-modern DTM, and a 3D model of the Fossa Carolina] for the identification and sediment budgeting of the backfills. Dendrochronological findings and radiocarbon ages of macro remains within the backfills give clear evidence for the erosional collapse of the canal project during or directly after the construction period. Moreover, our quantification approach allows the detection of the major sedimentary collapse zone. The exceedance of the manpower tipping point may have caused the abandonment of the entire construction site. The spatial distribution of the dendrochronological results indicates a north-south direction of the early medieval construction progress.

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Direct-Push-Technologien – Effiziente Untersuchungsmethoden für die Untergrunderkundung

Cited by 37 publications

References 105 publications

Kombination geophysikalischer und hydrogeologischer Methoden zur gezielten Erkundung feinkörniger Talfüllungen

Kombination geophysikalischer und hydrogeologischer Methoden zur gezielten Erkundung feinkörniger Talfüllungen

Technique, analysis routines, and application of direct push-driven in situ color logging

Sediment budgeting of short‐term backfilling processes: The erosional collapse of a Carolingian canal construction

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