Details
| Original language | English |
|---|---|
| Pages (from-to) | 173-180 |
| Number of pages | 8 |
| Journal | Soil and Tillage Research |
| Volume | 91 |
| Issue number | 1-2 |
| Publication status | Published - Dec 2006 |
| Externally published | Yes |
Abstract
Knowledge of soil shrinkage behavior is needed to improve the understanding and prediction of changes of unsaturated hydraulic properties in non-rigid soils. The heterogeneity and interaction of horizontal and vertical soil shrinkages that produce soil cracks and associated soil subsidence require additional quantification. Vertical shrinkage can be calculated easily by soil height with vernier caliper. However, a quantitative and feasible measurement of horizontal shrinkage has not been developed yet because of the complicated and irregular geometry of soil cracks. This paper introduces a new method to measure soil cracks non-destructively and continuously by digital image analysis. Using Adobe Photoshop and Windows Scion 4.02 image processing, the proposed procedure accurately identifies changes as small as 1.0 mm2 and shows differences even when areas of soil cracks were increased by as little as 1%. Various geometry factor values indicated soil shrinkage in the two dimensions was anisotropic during the whole drying. During initial dehydration from saturation, only subsidence shrinkage could be identified. With the further dehydration, the soil cracks developed and increased in size. These results suggest that the heterogeneity of soil shrinkage in 2D should be taken into account when modeling the total soil shrinkage behavior and associated unsaturated hydraulic properties.
Keywords
- Geometry factor, Image analysis, Scion imaging, Soil cracks, Soil shrinkage
ASJC Scopus subject areas
- Agricultural and Biological Sciences(all)
- Agronomy and Crop Science
- Agricultural and Biological Sciences(all)
- Soil Science
- Earth and Planetary Sciences(all)
- Earth-Surface Processes
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In: Soil and Tillage Research, Vol. 91, No. 1-2, 12.2006, p. 173-180.
Research output: Contribution to journal › Article › Research › peer review
}
TY - JOUR
T1 - Quantification of soil shrinkage in 2D by digital image processing of soil surface
AU - Peng, X.
AU - Horn, R.
AU - Peth, S.
AU - Smucker, A.
N1 - Funding Information: The first author is highly indebted to the German Research Foundation (DFG) for its grant PE1404/1-1.
PY - 2006/12
Y1 - 2006/12
N2 - Knowledge of soil shrinkage behavior is needed to improve the understanding and prediction of changes of unsaturated hydraulic properties in non-rigid soils. The heterogeneity and interaction of horizontal and vertical soil shrinkages that produce soil cracks and associated soil subsidence require additional quantification. Vertical shrinkage can be calculated easily by soil height with vernier caliper. However, a quantitative and feasible measurement of horizontal shrinkage has not been developed yet because of the complicated and irregular geometry of soil cracks. This paper introduces a new method to measure soil cracks non-destructively and continuously by digital image analysis. Using Adobe Photoshop and Windows Scion 4.02 image processing, the proposed procedure accurately identifies changes as small as 1.0 mm2 and shows differences even when areas of soil cracks were increased by as little as 1%. Various geometry factor values indicated soil shrinkage in the two dimensions was anisotropic during the whole drying. During initial dehydration from saturation, only subsidence shrinkage could be identified. With the further dehydration, the soil cracks developed and increased in size. These results suggest that the heterogeneity of soil shrinkage in 2D should be taken into account when modeling the total soil shrinkage behavior and associated unsaturated hydraulic properties.
AB - Knowledge of soil shrinkage behavior is needed to improve the understanding and prediction of changes of unsaturated hydraulic properties in non-rigid soils. The heterogeneity and interaction of horizontal and vertical soil shrinkages that produce soil cracks and associated soil subsidence require additional quantification. Vertical shrinkage can be calculated easily by soil height with vernier caliper. However, a quantitative and feasible measurement of horizontal shrinkage has not been developed yet because of the complicated and irregular geometry of soil cracks. This paper introduces a new method to measure soil cracks non-destructively and continuously by digital image analysis. Using Adobe Photoshop and Windows Scion 4.02 image processing, the proposed procedure accurately identifies changes as small as 1.0 mm2 and shows differences even when areas of soil cracks were increased by as little as 1%. Various geometry factor values indicated soil shrinkage in the two dimensions was anisotropic during the whole drying. During initial dehydration from saturation, only subsidence shrinkage could be identified. With the further dehydration, the soil cracks developed and increased in size. These results suggest that the heterogeneity of soil shrinkage in 2D should be taken into account when modeling the total soil shrinkage behavior and associated unsaturated hydraulic properties.
KW - Geometry factor
KW - Image analysis
KW - Scion imaging
KW - Soil cracks
KW - Soil shrinkage
UR - http://www.scopus.com/inward/record.url?scp=33749131982&partnerID=8YFLogxK
U2 - 10.1016/j.still.2005.12.012
DO - 10.1016/j.still.2005.12.012
M3 - Article
AN - SCOPUS:33749131982
VL - 91
SP - 173
EP - 180
JO - Soil and Tillage Research
JF - Soil and Tillage Research
SN - 0167-1987
IS - 1-2
ER -