Abstract
The search for simple models of drainage–irrigation systems functioning and management has still been an important research objective. Therefore, we presented a conceptual model based on groundwater dynamics equation along with proper assumptions on water equivalent of transient porosity-i.e., storage in the soil profile based on the long-term experience of the research on drainage-sub-irrigation systems. Several parameters have been incorporated in the model to effectively and comprehensively describe drainage/irrigation time, leakage from the soil profile, the soil moisture content in the root zone, and the shape of the groundwater table on the drainage–sub-irrigation plot. The model was successfully validated on groundwater level data in ditch midspacing on an experimental site located within a valley sub-irrigation system with the advantage of a relatively simple representation of flows through the soil profile. The robust character of the conceptual equation of groundwater dynamics, as well as the approach to its’ parameters, were proved through a close match between the model and observations. This promotes the capacities of the proposed modeling procedure to conceptualize drainage-irrigation development with the impact of external and internal sources of water. The potential was offered for the evaluation of water management practices in a valley system influenced by horizontal inflows from surrounding areas as indicated by calibration results. Future challenges were revealed in terms of water exchange between the plots and validation of soil moisture content modeling.
Highlights
We demonstrated a conceptual model developed in the original work of E.Kaca [11]
It is based on drainage/irrigation time constant and specific yield as conditioning groundwater table dynamics along with proper assumptions on fluxes through water table in the soil profile and so-called water equivalent
The modeling results were supported by necessary, specific assumptions on recharging fluxes, specific yield estimation basing on groundwater heads, and assumptions on water equivalent of transient porosity
Summary
The quantitative description of physical, chemical, and biological interactions in soils at multiple scales and degree of achievement has been an established goal and key challenge in soil and water sciences. The earliest numerical and analytical models date back to the last century referring mainly to the simulation of water flow [1], heat flow [2], solute transport processes [3], soil organic carbon [4], and nutrient dynamics [5]. The contemporary research field which still deserves attention and searches for innovative solutions is the drainage-irrigation scheduling including the parameters that can effectively delineate the process [11,12]. For this purpose, we demonstrated a conceptual model developed in the original work of E.Kaca [11]. Poland sub-irrigation system for the sake of possible alterations to water table management and a search for more simple models of drainage-irrigation practices development
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