How soil texture, channel shape and cross‐sectional area affect moisture dynamics and water loss in irrigation channels,Hydrological Processes

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How soil texture, channel shape and cross‐sectional area affect moisture dynamics and water loss in irrigation channels
Hydrological Processes ( IF 2.8 ) Pub Date : 2021-04-03 , DOI: 10.1002/hyp.14155
Zhifan Mu _{1,

2,

3} , Tianxiao Li _{1,

2,

3} , Dong Liu _{1,

2,

3} , Qiang Fu _{1,

2,

3} , Renjie Hou _{1,

2,

3} , Qinglin Li _{1,

2,

3} , Yi Ji _{1,

2,

3} , Song Cui _{1,

2,

3} , Mo Li _{1,

2,

3}

Affiliation

To enhance the utilization efficiency of farmland irrigation water and reduce the leakage of water conveyance channels, the leakage process of channels was simulated dynamically. The simulated results were compared with data measured in laboratory experiments, and the performance of the model was evaluated. The results indicated that the simulated values of the model were consistent with the observation values, and the R² values varied between 0.91 and 0.99. In addition, based on the laboratory experiments, a water supply system (Mariotte bottles) and soil box were built using plexiglass. Three influencing factors, namely, the channel form, soil texture and channel cross‐sectional area, were varied to observe and calculate the resulting cumulative infiltration amount, infiltration rate and wetting front migration distance. HYDRUS‐3D software was used to solve the three‐dimensional soil water movement equation under different initial conditions. The results demonstrated that the U‐shaped channel was more effective than the trapezoidal channel in increasing the utilization efficiency of the water resources. A U‐shaped channel with a small channel cross‐sectional area should be adopted and the soil particle size should be prioritized in the construction of water conveyance channels for farmlands. The simulation results were in agreement with the observed results, which indicates that HYDRUS‐3D is a reliable tool that can accurately simulate the soil moisture movement in water conveyance channels. The research results can provide a reference for the design and operation of farmland irrigation systems.

中文翻译：

土壤质地，通道形状和横截面积如何影响灌溉通道中的水分动力学和水分流失

为了提高农田灌溉水利用效率，减少输水通道的渗漏，动态模拟了渠道的渗漏过程。将模拟结果与实验室实验中测得的数据进行比较，并评估了模型的性能。结果表明，模型的仿真值与观测值一致，R ²值在0.91和0.99之间变化。此外，根据实验室实验，使用有机玻璃建造了供水系统（马里奥特瓶）和土壤箱。改变通道形态，土壤质地和通道横截面积这三个影响因素，以观察和计算最终的累计入渗量，入渗率和湿润前沿迁移距离。使用HYDRUS-3D软件求解不同初始条件下的三维土壤水分运动方程。结果表明，U形河道比梯形河道在提高水资源利用效率方面更为有效。在建设农田输水通道时，应采用截面积小的AU形通道，并优先考虑土壤粒径。仿真结果与实测结果吻合，表明HYDRUS-3D是一种可靠的工具，可以准确地模拟水在输水通道中的水分运动。研究结果可为农田灌溉系统的设计和运行提供参考。

更新日期：2021-04-19

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