Simulation of Dry Drainage to Determine the Ratio of the Width of Non-Cropped to Cropped Strip
Simulation of Dry Drainage to Determine the Ratio of the Width of Non-Cropped to Cropped Strip
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DOI：
10.1061/9780784479162.200
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发表时间：
2015-05
期刊：
影响因子：
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通讯作者：
D. Ahmad;S. Abbas;Liaghat Abdolmajid;D. A. Peyman
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文献类型：
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作者：
D. Ahmad;S. Abbas;Liaghat Abdolmajid;D. A. Peyman
干排水可以被认为是一种自然系统，其中休耕区的水蒸发控制邻近作物区的地下水位深度和土壤盐度。该技术需要部分灌溉土地退役。该系统最关键的设计标准之一是估计休耕带宽度的比率。为了模拟这种现象，设计并建造了一个由有机玻璃制成的长60厘米、宽20厘米、高50厘米的物理模型。该模型被分成两个相等的部分，其中前半部分定期灌溉，而另一部分在测试期间休耕。当土壤主要被盐结皮覆盖时，最小蒸发率为每天2.7毫米。由于大部分地区的实测值与常见的排水系数接近，考虑到风险较低，建议采用50%休耕与50%耕作的比例。结果表明，方便的管理和刮盐会导致较高的休耕比。
Dry drainage could be considered as a natural system in which water evaporation from fallow areas controls water table depth and soil salinity in neighboring cropped area. The technique requires part of the irrigated land retirement. One of the most key design criteria for this system is to estimate the ratio of cropped to fallow Strip width. To simulate this phenomenon, a physical model with the dimensions of 60 cm length, 20 cm width and 50 cm height made of Plexiglas have been designed and built. The model was divided into two equal parts in which the first half was regularly irrigated while the other left fallow during the test. The minimum evaporation rate was 2.7 mm per day when the soil was mainly covered with salt crusts. As the measured value is close to the common drainage coefficient in most parts, hence considering a low risk, the ratio of 50% fallow area to 50% cropping is recommended. The results suggest that convenient management and salt scraping would lead to higher ratio of cropped to non-cropped ratio.