| 地下水浅埋深条件下给水度与水位降深的关系 |
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| 引用本文： | 王小丽,程东会,乔晓英.地下水浅埋深条件下给水度与水位降深的关系[J].西部资源,2012(3):52-56. |
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| 作者姓名： | 王小丽 程东会 乔晓英 |
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| 作者单位： | 长安大学环境科学与工程学院,西安710054 |
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| 摘 要： | 本文研究地下水浅埋深条件下,水位降深为0-40cm、0-55cm、0-70cm、0-85cm、0-100cm时给水度的变化规律。利用室内风积砂的排水实验获得实测给水度,分析实测给水度与经验公式计算的给水度和水位降深的关系。结果表明,当水位降深小于毛细上升高度时,给水度较小,并随着水位降深的增加而增大。当水位埋深大于毛细上升高度时,给水度由毛细上升高度段及毛细上升高度以上段组成。毛细上升高度段,给水度随着水位降深的增加而增大,给水度较小。而毛细上升高度以上段,给水度较大,并随着水位降深的增加趋于定值。雷志栋公式计算的给水度与实测给水度最相近。而Nachabe和Duke公式在进气值高度上计算的给水度都比实测给水度大。这些成果为浅埋深情况下地下水位波动的准确估计提供依据。
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| 关 键 词： | 给水度 排水试验 毛细上升高度 |
The Relation between Specific Yield and Depth to Water Table under Shallow Water Table Conditions |
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| Xiaoli Wang Donghui Cheng Xiaoying Qiao.The Relation between Specific Yield and Depth to Water Table under Shallow Water Table Conditions[J].Western Resources,2012(3):52-56. |
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| Authors: | Xiaoli Wang Donghui Cheng Xiaoying Qiao |
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| Institution: | Xiaoli Wang Donghui Cheng Xiaoying Qiao (1. College of Environmental Sciences and Engineering, Chang＇ an University, Xi＇ an 710054, China) |
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| Abstract: | The paper analyzes the change of specific yield when depth to water table in 0-40cm,0-55cm,0-70cm,0-85cm,0-100cm under shallow water table through the drainage experiment to determine the changes of gravity specific yield from the soil surface to a different depth to water table. And also analyzes the changes of the measured specific yield with the empirical formula calculated by the specific yield in different depth. The analysis results show that, When the depth to water table less than the height of the capillary fringe above the water table,specific yield is smaller, and the specific yield increases with the increase of the buried depth. With the increase of drawdown, when the water depth is greater than the height of capillary fringe, this section water supply is divided into two parts, the capillary rise height of segment and capillary height of the above paragraph. The specific yield increases with the increase of the buried depth in the height of the capillary fringe. And capillary rise high above section, specific yield is larger, With the increase of the buried depth, the specific yield is constant. Lei Zhidong specific yield equation calculation of water degrees with measured values of the specific yield.But in the soil air-entry pressure head, Nachabe and Duke equation calculation of water greater than the measured values of the specific yield.These results provided a basis to estimate water table fluctuation under shallow water table. |
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| Keywords: | specific yield the drainage experiment the height Of the capillary fringe |
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