Field study on the influence of subsurface drainage pipes and envelopes on discharge and salt leaching in arid areas

Abstract

The selection of suitable drainage materials is crucial for the efficient operation of subsurface drainage systems. Previous studies on drainage material selection have focused on anti‐clogging characteristics, and less attention has been given to their effects on the process of soil salt leaching, which is an important consideration in arid and semi‐arid areas. To investigate the influence of subsurface drainage pipes and envelopes on salt leaching and discharge, field leaching experiments under flood irrigation and drip irrigation were conducted in Xinjiang region in China. Results show that the amount of drainage water in treatments that use gravel envelopes is higher than that in treatments that use synthetic envelopes. Meanwhile, the amount of drainage water in treatments that use gravel envelopes decreases the most after 1 year of operation. The synthetic envelope, the interaction between the perforation rate of the drainage pipe and the synthetic envelope significantly influence water and salt discharge. The optimal level of the synthetic envelope used in this study is spun‐bonded non‐woven geotextile, that of the layer number of envelopes is a single layer, and that of the perforation rate of the drainage pipe is 3.0%.

Evaluating the necessity of autumn irrigation on salinized soil by considering changes in soil physicochemical properties

“…According to the statistics of the Food and Agriculture Organization (FAO) of the United Nations, the global salinization area accounts for approximately 23% of the cultivated land area (FAO 2016) and continues to expand at a rate of more than 2 Mha per year (Abbas et al 2013). Proper irrigation is the main management measure used to control soil salinization (Aragues et al 2015;Machado and Serralheiro 2017), and it is widely used, especially in cold/arid regions (Li et al 2022). For example, in the Hetao Irrigation District in northwestern China, the effects of seasonal freezing and thawing and evaporation lead to serious soil salinization problems (Tan et al 2021).…”

Effects of geotextile envelope and perforations on the performance of corrugated drain pipes

“…Drainage materials (i.e., pipes and envelopes) are important factors that affect the efficiency and lasting performance of subsurface drainage systems [1][2][3] . The renewal of materials and related theories have promoted the development of drainage technology [4,5] .…”