An objective framework for determination of the air-entry value from the soil–water characteristic curve

The air-entry value (AEV) suction, marking the transition between saturated and unsaturated soil mechanics, is arguably most important parameter interpreted from soil–water characteristic curve (SWCC); its accurate determination being essential for prediction of properties. AEV commonly obtained by a subjective time-consuming graphical construction. This micro-article proposes an objective framework, developed based on practical mathematical translation technique, determination. Explicit equations are derived eleven well-established SWCC fitting functions, covering wide range functional complexities. In addition to nature (providing unique interpretations AEV), proposed framework complements numerical implementations constitutive models.