| 周广林,王全九,李 云,苏李君.Hydrus-3D模型模拟田间点源入渗与水分再分布准确性评价[J].干旱地区农业研究,2015,33(2):113~121 |
| Hydrus-3D模型模拟田间点源入渗与水分再分布准确性评价 |
| Accuracy evaluation of simulating point source infiltration in field and water redistribution based on Hydrus-3D model |
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| DOI：10.16302/j.cnki.1000-7601.2015.02.019 |
| 中文关键词: Hydrus3D 模型评价 水分再分布 |
| 英文关键词:Hydrus 3D model evaluation water redistribution |
| 基金项目:新疆“十二五”科技重大专项“新疆绿洲灌区节水关键技术和用水安全研究与示范”（2011BAD29B05） |
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| 中文摘要: |
| 滴灌条件下水分入渗与再分布是评价滴灌灌溉效率的重要内容，通过Hydrus3D模型模拟单点源和点源交汇情况下水分入渗及其再分布过程，并利用田间试验实测资料进行验证。结果表明：采用Hydrus3D软件建立的模型可较好地模拟单点源水分入渗、水平湿润锋扩散过程及土壤剖面水分的分布情况，水平湿润锋距离的模拟值和实测值的误差在灌水结束时达到最大，且滴头流量越大，误差亦越明显，其中最大绝对误差为4.6 cm，最大相对误差达0.167，R2在0.95以上，F检验P值大于0.05，且RMSE在2.1以内；模型模拟的土壤体积含水量分布和实测值基本一致，模拟值和实测值的R2在0.90以上，F检验P值大于0.05，RMSE均小于0.07；湿润范围模拟结果和实测结果的吻合度较高。灌水结束后20 h，模拟土壤剖面含水量的分布情况与实测值基本一致，模拟值和实测值R2在0.575～0.652之间，F检验P值大于0.05，RMSE在0.013左右，双点源交汇区整个剖面模拟值和实测值R2为0.526以上，F检验P值大于0.05，RMSE均小于0.01，模拟结果较好，说明Hydrus3D模型可模拟土壤水分再分布情况。 |
| 英文摘要: |
| Under the drip irrigation condition, the water infiltration and redistribution process is an important content of evaluating irrigation efficiency. Through the Hydrus-3D model, has simulated the single point source infiltration and redistribution, and verified by the measured information of the field experiments. Tthe results showed tha：Using the Hydrus-3D software to set up the model, it can be good simulated the single point source infiltration, horizontal wetting front diffusion process and the distribution situation of soil water in soil profile. The error between simulated and measured values of the distance for the horizontal wetting front was reached the maximum when the e
nd of irrigation, also the bigger of the trickle discharge, the more obvious of the error. Among them the maximal absolute error was 4.6 cm, the maximal relative error was 0.167 and the R2 was more than 0.95. The P value in F-test was more than 0.05 and RMSE was less than 2.1. The simulated soil water content distribution was quiet consistent with the measured values, the R2 of simulated and measured values was above 0.90, the P value in F-test was more than 0.05 and RMSE was less than 0.07. The simulated and measured soil wetting range was higher degree of agreement. After end of irrigation for 20 hours, the simulated water content distribution in soil profile was in agreement with the measured values, the R2 between simulated and measured values was between 0.575～0.652, the P value in F-test was more than 0.05 and RMSE was about 0.013. Whole profile in double point sources interference area, the R2 of simulated and measured values was above 0.526, the P value in F-test was more than 0.05, RMSE was total less than 0.01. The simulated results were quite good, it explained that the situations of soil water redistribution can be simulated by the Hydrus3D model. |
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