Stochastic model for posttillage soil pore space evolution

Stochastic model for posttillage soil pore space evolution

Tillage operations disrupt surface layers of agricultural soils, creating a loosened structure with a substantial proportion of interaggregate porosity that enhances liquid and gaseous exchange properties favorable for plant growth. Unfortunately, such desirable soil tilth is structurally unstable and is susceptible to change by subsequent wetting and drying processes and other mechanical stres...

Detection of pore space in CT soil images

Biogeosciences Discussions This discussion paper is/has been under review for the journal Biogeosciences (BG). Please refer to the corresponding final paper in BG if available. Abstract Computed Tomography (CT) images provide a non-invasive alternative for observing soil structures, particularly pore space. Pore space in soil data indicates empty or free space in the sense that no material is p...

A Stochastic Optimization Model for Groundwater Management

A Stochastic Model for Water Resources Management

Irrigation water management is crucial for agricultural production and livelihood security in many regions and countries throughout the world. Over the past decades, controversial and conflictladen water-allocation issues among competing municipal, industrial and agricultural interests have raised increasing concerns. Particularly, growing population, varying natural conditions and shrinking wa...

A stochastic model of evolution

We propose an alternative to the Bak-Sneppen model for species survival. In our model the number of species is random. Births and deaths occur with constant probabilities and it is only the species with lowest fitness which is removed. We show that there is a sharp phase transition when the birth probability is larger than the death probability. The set of species with fitness higher than a cer...