Impact of Water Allocation on Soil Desalination and Groundwater Hydro-chemical Characteristics: A Temporal and Spatial Analysis of a Case Study Region in China

Abstract

The negative effect of water allocation has been rarely evaluated for improving water resources use efficiency in canal well combined irrigation district. The results showed that more surface water irrigation could drive salinity leaching to the lower soil horizons while average TDS concentration of groundwater has been increased by 18.66% in the study area. We found that combined well canal irrigation could be of water allocation method due mainly to temporal and spatial regulation water resources and root layer soil desalination, however, the possible increasing of TDS in the groundwater may cause potential risk after long term implementing water allocation in a semi-arid area