A Technical Note: Orientation of Cracks and Hydrology in a Shrink-Swell Soil

Takele M. Dinka, Robert J. Lascano

Department of Soil and Crop Sciences, Texas A&M University, College Station, TX, USA.
USDA-ARS1 Cropping Systems Research Laboratory, Wind Erosion and Water Conservation Research Unit, Lubbock, TX, USA..

DOI: 10.4236/ojss.2012.22013                

Abstract

Crack orientations are an important soil physical property that affects water flow, particularly in vertic soils. However, the spatial and temporal variability of crack orientations across different land uses and gilgai features is not well-documented and addressed in hydrology models. Thus; there is a need to quantify crack orientations for different land uses and to incorporate their spatial and temporal dynamics into hydrological models. Our objectives were to document the spatial variability of cracks orientations across two land uses and to demonstrate the potential importance of crack orientation related to the hydrology of Vertisols. The exploratory field measurements of the spatial distribution of crack orientations across two Vertisol catenae of two land uses and gilgai features are presented. The field survey showed the complexity of crack geometry in a field, the potential impact of crack orientation on Vertisol hydrology and the challenges associated with measurement of crack orientations.

Keywords

Crack; Orientation; Hydrology

Conflicts of Interest

The authors declare no conflicts of interest.

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