Modeling the dynamics of water and thermal regimes of a dry area under the variation in atmospheric precipitation

摘要

The aim of the work is the development of a mathematical model for the moisture and water-thermal regime dynamics within arid and semi-arid areas. The base of model is the differential equations of water and heat balance of soil. The income of energy (absorbed solar radiation), water outcome components (evaporation and run-off) and energy outcome components (turbulent heat-exchange of ground surface with atmosphere, evaporation and effective radiation) were related through heat and water storage of soil. The relations between income-outcome characteristics and storage components permitted the soil water and heat balance equations to combine into the system. The solutions were analyzed for leap-pattern and linear changes of precipitation and for their variations simulated by periodic function.