| 降水入渗补给过程中优先流的确定 |
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| 引用本文： | 齐登红,靳孟贵,刘延锋.降水入渗补给过程中优先流的确定[J].地球科学,2007,32(3):420-424. |
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| 作者姓名： | 齐登红 靳孟贵 刘延锋 |
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| 作者单位： | 1.河南省地质环境监测院, 河南郑州 450006 |
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| 基金项目： | 国家自然科学基金项目(No.40472123) |
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| 摘 要： | 优先流是降水、灌溉水等入渗补给地下水的主要形式之一, 流速快, 流动路径复杂, 难以定量描述.针对优先流难以定量描述的问题, 以郑州地中渗透仪观测资料为基础, 探讨了新乡亚砂土等试筒降水入渗过程及其中的优先流补给量比例.根据土壤的水力性质、气候等资料建立不存在优先流的数值模拟模型来刻画降水入渗补给过程, 通过模拟获得的地下水入渗补给量与实测地下水入渗补给量的历时曲线, 将大于模拟值的实测值视为优先流的量及确定其在总补给量中所占的比例.结果表明, 优先流占总补给量的比例在10%~80%之间; 随着土壤粘性增加, 优先流所占比例呈增加趋势; 随地下水位埋深的增大, 优先流所占比例呈逐渐下降趋势.
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| 关 键 词： | 地中渗透仪 优先流 降水入渗补给 模拟模型 |
| 文章编号： | 1000-2383（2007）03-0420-05 |
| 收稿时间： | 2006-08-12 |
| 修稿时间： | 2006-08-12 |
Determination of Preferential Flow in Precipitation Infiltration Recharge |
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| QI Deng-hong,JIN Meng-gui,LIU Yan-feng.Determination of Preferential Flow in Precipitation Infiltration Recharge[J].Earth Science-Journal of China University of Geosciences,2007,32(3):420-424. |
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| Authors: | QI Deng-hong JIN Meng-gui LIU Yan-feng |
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| Institution: | 1. General Geo-environrnental Monitoring Station of Henan Province , Zhengzhou 450006, China; 2. School of Environmental Studies, China University of Geosciences, Wuhan 430074, China |
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| Abstract: | Preferential flow is one of main forms of infiltration recharge from rainfall and irrigation to groundwater.It has the characteristics of rapid flow rate,complicated flow path and being very difficult to be quantified.To quantify the preferential flow in the infiltration recharge process and its percentage in total infiltration recharge,a new method has been developed based on the measured infiltration recharge of lysimeters in Zhengzhou Groundwater Balance Test Field.The numerical simulation model that can describe the piston flow in lysimeters by rechards equation was constructed and calibrated according to the soil hydraulic parameters,weather data and so on.The surplus part in the calculated flux can be regarded as the preferential flow because the preferential flow flows faster than piston flow and reaches groundwater earlier.By comparing the measured recharge flux and calculated recharge flux,the quantity of preferential flow and its percentage in total precipitation infiltration recharge can be determined.The preferential flow makes up 10%-80% in total precipitation infiltration recharge.The percentage is higher when the soil contains more clay,and the percentage is lower when the groundwater level is deeper. |
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| Keywords: | lysimeter preferential flow precipitation infiltration recharge simulation modeling |
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