| 滴灌土壤湿润体特征值的数值算法 |
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| 引用本文： | 李光永 曾德超. 滴灌土壤湿润体特征值的数值算法[J]. 水利学报, 1997, 0(7): 1-6 |
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| 作者姓名： | 李光永 曾德超 |
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| 作者单位： | 中国农业大学水利与土木工程学院 |
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| 摘 要： | 本文提出了一种新的计算地表点源滴灌土壤水分入渗湿润体特征值的通用数值方法，经过无量纲变换，将地表点源滴灌土壤水分入渗方程转换为无量纲方程。采用Ｖａｎ Ｇｅｎｕｃｈｔｅｒ函数表征有效含水量与压力水头间的关系和相对水力传导率与压力水头间的关系。无量纲数值解仅依赖于无量纲滴头流量和无量纲入渗时间，通用数值计算得到了数值解的验证，并将通用数值计算结果图形化，使用者仅根据本文提供的图形和易测的土壤参数。经过
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| 关 键 词： | 滴灌 入渗 土壤 湿润体 数值算法 灌溉 |
The mathematical method for calculating the characteristic value of wetted volume under surface drip irrigation |
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| Li Guangyong Zeng Dechao. The mathematical method for calculating the characteristic value of wetted volume under surface drip irrigation[J]. Journal of Hydraulic Engineering, 1997, 0(7): 1-6 |
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| Authors: | Li Guangyong Zeng Dechao |
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| Affiliation: | China Agricultural University |
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| Abstract: | The mathematical method is presented for calculating the characteristic value of wetted volume.Richard equation for axial symmetric flow is changed to a dimensionless form with dimensionless variables.The dimensionless solution depends only on dimensionless flow rate of dripped and dimensionless irrigation time.Results are checked with the existing numerical solution and illustrated by diagrams.Readers can know the characteristic value at specified condition with the graph and some soil parameters which are easily measured. |
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| Keywords: | drip irrigation water infiltration mathematical method. |
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