A new framework to determine general multimodal soil water characteristic curves

Abstract A soil water characteristic curve (SWCC) model named as discrete-continuous multimodal van Genuchten with a convenient parameter calibration method is developed to describe the relationship between suction and content of complex pore structure. The modality number N SWCC in proposed can be any positive integer (the so-called or -modal SWCC). unique set parameters determined by combining fitting graphical based on shape features log s –log S e plane. In addition, reduction minimize simplify form function. validated using bimodal trimodal measurements from different soils, which yield strong consistency fitted curves measured data. uniqueness provides possibility further improve correlating properties state parameters.