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- Title
A scaling approach, predicting the continuous form of soil moisture characteristics curve, from soil particle size distribution and bulk density data.
- Authors
Meskini-Vishkaee, F.; Mohammadi, M. H.; Vanclooster, M.
- Abstract
A substantial number of models, predicting the Soil Moisture Characteristic Curve (SMC) from Particle Size Distribution (PSD) data, underestimate the dry range of the SMC especially in soils with high clay and organic matter contents. In this study, we applied a continuous form of the PSD model to predict the SMC and subsequently, we developed a physically based scaling approach to reduce the model's bias at the dry range of the SMC. The soil particles packing parameter, obtained from the porosity was considered as a characteristic length. The model was tested by using eighty-two soil samples, selected from the UNSODA database. The result showed that the scaling approach properly estimate the SMC for all soil samples. In comparison to the formerly used physically based SMC model, the proposed approach improved the model estimations by an average of 30% for all soil samples. However, the advantage of this new approach was larger for the fine and medium textured soils than that for the coarse extured soil. In view that in this approach there is no further need for empirical parameters, we conclude that this approach could become applicable for estimating SMC at he larger field scale.
- Subjects
SOIL moisture; SCALING laws (Statistical physics); SOIL particles; PARTICLE size distribution; HUMUS; SOIL porosity; SOIL texture
- Publication
Hydrology & Earth System Sciences Discussions, 2013, Vol 10, Issue 11, p14305
- ISSN
1812-2108
- Publication type
Article
- DOI
10.5194/hessd-10-14305-2013