PDF(Pubmed)
Abstract：
The ground surface and subsurface of green parks in arid and desert areas may be subjected to desiccation as a result of weather and hot temperatures. It is not wise to wait until plants are turning pale and yellow before watering is resumed. Given the scarcity of water in typical desert zones, we recommend full control of irrigation water. This study presents a method of recycling irrigation water using 5TE sensors, employing time-domain reflectometry (TDR) technology. A trial test section was constructed along the coast of the eastern province of Saudi Arabia. Water recycling involves using clay-sand liners placed below the top agricultural soils to intercept excess water and direct it towards a collection tank, and then it is pumped out to a major water supply tank. The main properties of soils and clay-sand liners normally taken into account include moisture content, density, and hydraulic conductivity. An assessment of geotechnical properties of clay-sand mixtures containing 20% clay content was conducted. The profiles of moisture and temperature changes were monitored using 5TE sensors and data loggers. The 5TE sensors provided continuous measurements at varying temperatures and watering cycles. Twenty-nine watering cycles were conducted over a six-month period. An additional section was considered with a liner consisting of the same clay but enhanced with bentonite as one-third of the clay content. The volumetric water content was found to vary from 0.150 to 0.565 following changing weather and direct watering cycles. The results indicated that the use of a TDR instrumentation is a cost-effective and time-saving technique to construct a system for saving irrigation water.
摘要：
干旱和沙漠地区的绿色公园的地面和地下可能会因天气和高温而干燥。在恢复浇水之前，等到植物变得苍白和黄色是不明智的。鉴于典型的沙漠地区缺水，我们建议完全控制灌溉用水。本研究提出了一种使用5TE传感器回收灌溉水的方法，采用时域反射(TDR)技术。在沙特阿拉伯东部省的沿海建造了一个试验试验段。水循环利用涉及使用放置在表层农业土壤下方的粘土砂衬里来拦截多余的水并将其引向收集罐，然后将其泵送到主要的供水箱中。通常考虑的土壤和粘土砂衬垫的主要特性包括水分含量，密度,和水力传导性。对粘土含量为20％的粘土砂混合物的岩土工程性能进行了评估。使用5TE传感器和数据记录器监测湿度和温度变化的曲线。5TE传感器在不同的温度和浇水周期提供连续测量。在六个月的时间内进行了29个浇水周期。考虑使用由相同粘土组成的衬里的附加部分，但用膨润土作为粘土含量的三分之一来增强。随着天气变化和直接浇水周期的变化，发现体积水含量在0.150至0.565之间变化。结果表明，使用TDR仪器是一种经济高效且节省时间的技术，可以构建节约灌溉水的系统。
