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为探究微孔陶瓷灌水器在地下灌溉的入渗特性,基于土壤水动力学原理,在前人对微孔陶瓷灌水器周围土壤水势分析的基础上,建立了无压条件下微孔陶瓷灌水器在土壤中的出流模型,并通过室内土桶试验验证了模型的准确性。结果表明:该文提出的出流模型可以较好地模拟无压条件下微孔陶瓷灌水器土壤中的出流现象。在0m工作水头下,灌水器周围土壤含水率变化是造成灌水器流量变化的根本原因,土壤含水率较低时,灌水器可以较大流量出流;随着灌溉的进行,土壤含水率逐渐增加,使得灌水器流量减小;当土壤含水率达到饱和后,灌水器就会停止出流。而当土壤水分耗散时,灌水器又可恢复出流,灌水器出流量与土壤水分耗散量基本相当,因此灌水器出流可以实时补充土壤水分。本研究可为微孔陶瓷灌水器的推广应用提供参考。
In order to explore the infiltration characteristics of microporous ceramic emitter in underground irrigation, based on the principle of soil hydrodynamics, based on previous analysis of soil water potential around microporous ceramic emitter, a microporous ceramic emitter The outflow model in the soil, and through indoor soil barrel test to verify the accuracy of the model. The results show that the outflow model proposed in this paper can well simulate the outflow in the soil of microporous ceramic emitter under pressureless condition. Under 0m working head, the change of soil moisture content around the emitter is the root cause of the change of emitter flow rate. When the soil moisture content is low, the emitter can flow out with larger flow rate. With the irrigation, the soil moisture content increases gradually , So that the emitter flow rate decreases; when the soil moisture content reaches saturation, the emitter will stop outflow. And when the soil moisture dissipation, the emitter can be restored to the outflow, emitter flow and soil water dissipation is basically the same, so the emitter outflow can be real-time replenishment of soil moisture. This study may provide a reference for the popularization and application of microporous ceramic emitter.