水分灌溉条件下土壤湿体含水率分布模型

IF 1 4区环境科学与生态学 Q4 WATER RESOURCES

Water SA Pub Date : 2023-01-31 DOI:10.17159/wsa/2023.v49.i1.3979

Yanwei Fan, Weifan Yin, Zhiwei Yang, Yanxiang Wang, Liangjun Ma

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引用次数: 1

摘要

研究了不同影响因素下土壤湿体的水分分布特征，为水分灌溉系统的设计和管理提供依据。基于Hydrus-2D软件，建立了滴灌条件下土壤水分运动的数学模型。通过室内实验验证了Hydrus-2D仿真模型的适用性。利用Hydrus-2D软件进行了数值模拟，研究了土壤质地、初始含水率、水比流量和灌溉时间对土壤湿体水分分布的影响。土壤含水率在湿管处最高，其数值与湿比流量和土壤质地有关。在垂直向下、45°向下、水平向上、45°向上和垂直向上5个设定方向上，润湿体各点土壤含水量随润湿锋到润湿管距离的增加呈线性下降。这种趋势适用于细质土和粗质土。提出了包括土壤饱和导水率、土壤初始含水量、湿管比流量和各方向湿润锋距最大值在内的土壤含水量估算模型。模型估计良好(均方根误差= 0.008-0.018 cm3·cm−3，接近于0;Nash-Sutcliffe效率系数= 0.987，接近于1)，可为滴灌设计和农业用水管理提供实用工具。

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Moisture content distribution model for the soil wetting body under moistube irrigation

This study investigated the moisture distribution characteristics of a soil wetting body under different influencing factors to inform the design and management of a moistube irrigation system. A mathematical model of soil moisture movement under moistube irrigation was established based on Hydrus-2D software. The suitability of the Hydrus-2D simulation model was verified by laboratory experiments. Numerical simulations were carried out with Hydrus-2D to investigate the influence of soil texture, initial moisture content, moistube specific discharge and irrigation time on the moisture distribution of a soil wetting body. The soil moisture content is highest at the moistube, and its value is related to the moistube-specific discharge and soil texture. The soil moisture content at any point in the wetting body decreased linearly with increasing distance from the wetting front to the moistube in the five set directions (vertical downward, 45° downward, horizontal, 45° upward and vertical upward). This trend is applicable to fine-textured and coarse-textured soil. An estimation model of soil moisture content including soil saturated hydraulic conductivity, initial soil moisture, the specific flow rate of the moistube and the maximum value of the wetting front distance in all directions is proposed. The model estimation is good (root mean square error = 0.008–0.018 cm3·cm−3, close to 0; Nash-Sutcliffe efficiency coefficient = 0.987, close to 1), and it can provide a practical tool for moistube irrigation design and agricultural water management.

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来源期刊

Water SA 环境科学-水资源

CiteScore

2.80

自引率

6.70%

发文量

审稿时长

18-36 weeks

期刊介绍： WaterSA publishes refereed, original work in all branches of water science, technology and engineering. This includes water resources development; the hydrological cycle; surface hydrology; geohydrology and hydrometeorology; limnology; salinisation; treatment and management of municipal and industrial water and wastewater; treatment and disposal of sewage sludge; environmental pollution control; water quality and treatment; aquaculture in terms of its impact on the water resource; agricultural water science; etc. Water SA is the WRC’s accredited scientific journal which contains original research articles and review articles on all aspects of water science, technology, engineering and policy. Water SA has been in publication since 1975 and includes articles from both local and international authors. The journal is issued quarterly (4 editions per year).