Soil Salinity Control in Irrigated Land with Agricultural Drainage Systems

Abstract

in the unit of time per unit of the aquifer L 3 , υ = υ (H) is the drainable porosity as a head function, and K s is the saturated hydraulic conductivity L T −1. The storage capacity, see [24], is: μ (H) = θ s − θ(H − H s), where θ s is the saturated volumetric water content L 3 L −3 , and θ(H − H s) represents the water content evolution in the position z = H s , while the free surface decreases, and z is the elevation of ground surface L. 2.2. The drainable porosity To calculate the storage capacity and the drainable porosity it is necessary to provide the soil water retention curve. The model of van Genuchten [25] was accepted in field and laboratory Agroecology 102 Soil Salinity Control in Irrigated Land with Agricultural Drainage Systems

Calibration and Sensitivity Analysis of Sahysmod for Modeling Field Soil and Groundwater Salinity Dynamics in Coastal Rainfed Farmland

“…For instance, from 15 October 2013 to 6 January 2014, groundwater salinity decreased from 25.9 to 8.97 dS m −1 whereas the groundwater table was lowered from 0.34 to 1.86 m. This could be ascribed to the fact that soil salts were leached to groundwater through infiltration in the rainy season, whereas salts in the groundwater were transported upward through capillary action in the dry season. Moreover, the drainage system played an important role in soil and groundwater salinity control, in which the salt concentration of the drainage water was much higher than that of the irrigation water, thus salt export considerably exceeded salt import and salinization was controlled (Chávez et al, ).…”