Universität zu Köln

Mohren, Joel, Binnie, Steven A., Rink, Gregor M., Knodgen, Katharina, Miranda, Carlos, Tilly, Nora and Dunai, Tibor J. (2020). A photogrammetry-based approach for soil bulk density measurements with an emphasis on applications to cosmogenic nuclide analysis. Earth Surf. Dyn., 8 (4). S. 995 - 1021. GOTTINGEN: COPERNICUS GESELLSCHAFT MBH. ISSN 2196-632X

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Abstract

The quantification of soil bulk density (rho(B)) is a cumbersome and time-consuming task when traditional soil density sampling techniques are applied. However, it can be important for terrestrial cosmogenic nuclide (TCN) production rate scaling when deriving ages or surface process rates from buried samples, in particular when short-lived TCNs such as in situ C-14 are applied. Here, we show that soil density determinations can be made using structure-from-motion multi-view stereo (SfM-MVS) photogrammetry-based volume reconstructions of sampling pits. Accuracy and precision tests as found in the literature and as conducted in this study clearly indicate that photographs taken from both a consumer-grade digital single-lens mirrorless (DSLM) and a smartphone camera are of sufficient quality to produce accurate and precise modelling results, i.e. to regularly reproduce the true volume and/or density by > 95 %. This finding holds also if a freeware-based computing workflow is applied. The technique has been used to measure rho(B) along three small-scale (< 1 km) N-S transects located in the semi-arid to arid Altos de Talinay, northern central Chile (similar to 30.5 degrees S, similar to 71.7 degrees W), during a TCN sampling campaign. Here, long-term differences in microclimatic conditions between south-facing and north-facing slopes (SFSs and NFSs, respectively) explain a sharp contrast in vegetation cover, slope gradient and general soil condition patterns. These contrasts are also reflected by the soil density data, generally coinciding with lower densities on SFSs. The largest differences between NFSs and SFSs are evident in the lower portion of the respective slopes, close to the thalwegs. In general, field-state soil bulk densities were found to vary by about 0.6 g cm(-3) over a few tens of metres along the same slope. As such, the dataset that was mainly generated to derive more accurate TCN-based process rates and ages can be used to characterise the present-day condition of soils in the study area, which in turn can give insight into the long-term soil formation and prevailing environmental conditions. This implies that the method tested in this study may also being applied in other fields of research and work, such as soil science, agriculture or the construction sector.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Mohren, Joel UNSPECIFIED UNSPECIFIED UNSPECIFIED Binnie, Steven A. UNSPECIFIED UNSPECIFIED UNSPECIFIED Rink, Gregor M. UNSPECIFIED UNSPECIFIED UNSPECIFIED Knodgen, Katharina UNSPECIFIED UNSPECIFIED UNSPECIFIED Miranda, Carlos UNSPECIFIED UNSPECIFIED UNSPECIFIED Tilly, Nora UNSPECIFIED UNSPECIFIED UNSPECIFIED Dunai, Tibor J. UNSPECIFIED UNSPECIFIED UNSPECIFIED
URN:	urn:nbn:de:hbz:38-310819
DOI:	10.5194/esurf-8-995-2020
Journal or Publication Title:	Earth Surf. Dyn.
Volume:	8
Number:	4
Page Range:	S. 995 - 1021
Date:	2020
Publisher:	COPERNICUS GESELLSCHAFT MBH
Place of Publication:	GOTTINGEN
ISSN:	2196-632X
Language:	English
Faculty:	Unspecified
Divisions:	Unspecified
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language FROM-MOTION PHOTOGRAMMETRY; ECOGEOMORPHIC EXPRESSIONS; VEGETATION GRADIENT; PRODUCTION-RATES; EROSION; CLIMATE; BE-10; SENSITIVITY; QUARTZ; AL-26 Multiple languages Geography, Physical; Geosciences, Multidisciplinary Multiple languages
URI:	http://kups.ub.uni-koeln.de/id/eprint/31081