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Fig. 6 | Irrigation Science

Fig. 6

From: Measurement and heuristic modelling of nitrogen and salt dynamics under Salicornia growing in a hyper-arid region and irrigated with groundwaters of differing nutrient and Salt loadings

Fig. 6The alternative text for this image may have been generated using AI.

The predicted temporal draw-down in the aquifer depth with the number of years using the prediction of the depth of the saturated layer ht from Eq. (1) (—). The initial aquifer thickness is assumed to be ho = 100 m and saturated water content ӨA (m3 m− 3), and the annual rate of evapotranspiration from the irrigated crop is 1.61 m3 m− 2. The time course in the concentration of salt and nitrate in groundwater predicted by Eq. [3] is given for salt (—) and nitrate (----). The initial values were for salt C0 = 18.8 kg m− 3, and nitrate N0 = 30 mg L− 1. Five years after irrigation starts the solute front reaches groundwater. The origin of the abscissa, t = 0, is time to when the impacts of solute leaching are first felt in groundwater at the base of the unsaturated vadose zone of depth d. Note that for graphical convenience the numerical values on the vertical axis refer to different units in relation to the parameters graphed of aquifer depth (m), salt concentration (mg m− 3), and nitrate concentration (mg L− 3)

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