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首页> 外文期刊>Paddy and Water Environment >Analysis by numerical experiments of desalinization of a salt-affected paddy field using a rice husk underdrainage system
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Analysis by numerical experiments of desalinization of a salt-affected paddy field using a rice husk underdrainage system

机译：在排水系统下使用稻壳稻壳脱盐的数值实验分析

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摘要

In a monsoon climate, salt accumulates not only in drylands, but also in paddy fields during the dry season. Because natural desalinization by gravitational drainage is very difficult in paddy fields, drainage facilities are needed to remove salts from affected paddy fields. A rice husk underdrainage system (RHUS) is one applicable method. Although this system is simple and reasonable, there is an unfortunate lack of available information for its practical realization. In this study, we conducted numerical field-scale experiments with an RHUS using HYDRUS 2D/3D software to obtain information for designing such a system. Our results clarified the effect of outlet size, rice husk drain (RHD) width, and RHD gradient on the amount of discharged soil water/salts and saline water movement in the paddy field. We summarized our results as follows: (1) outlet size did not affect the system's drainage ability; (2) small-width RHD discharged saline soil water at a greater rate than large-width RHD when using the same amount of leaching water; (3) because the RHD worked as a bypass of saline water movement from the plow layer to the lower soil layer, the amount of saline water removed from the plow layer was larger with the large-width RHD than with the small-width RHD; and (4) the large gradient of the RHD was advantageous in increasing the amount of discharged saline soil water, but the effect was small, so it appears unnecessary for practical application.
机译：在季风气候中，盐不仅在旱地中积累，而且在干燥季节期间在稻田中积累。由于在稻田中的引力排水的自然脱盐非常困难，因此需要排水设施来从受影响的稻田中除去盐。稻壳净水系统（RHUS）是一种适用方法。虽然这种系统很简单合理，但缺乏缺乏可用信息的实际实现。在这项研究中，我们使用Hydrus 2D / 3D软件与Rhus进行了数值场规模实验，以获得设计这种系统的信息。我们的结果阐明了出口尺寸，稻壳排水管（RHD）宽度和RHD梯度对稻田中排出的土壤水/盐和盐水运动量的影响。我们总结了我们的结果如下：（1）出口尺寸不影响系统的排水能力; （2）当使用相同量的浸出水时，小宽度RHD以比大宽度RHD更大的速度排出盐水土壤; （3）因为RHD作为旁路从犁水的旁路从犁层到下部土壤层，所以从犁层中除去的盐水量大于小宽度RHD的大宽度。 （4）RHD的大梯度是有利于增加排出的盐水土壤水的量，但效果很小，因此实际应用看起来不必要。

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