基于水平井技术的农田排水数值模拟研究

发布时间：2018-06-20 17:57

  本文选题：水平井 + 农田排水　； 参考：《中国农村水利水电》2017年09期

【摘要】：为了改良盐渍化土壤,合理开发浅层咸水资源,以华北滨海盐渍化土壤及浅层地下水为研究对象,通过建立Hydrus-Modflow耦合模型,利用水平井试验区实测土壤、气象、抽水试验数据等资料,探讨了水平井不同排水方式下地下水位的动态变化特征。结果表明,在天然状态下试验区地下水蒸发深度在2.5 m左右;以降低潜水位至临界深度为控制标准,单条水平井可以控制土地面积约6.67 hm~2;并且控制范围随着年抽水量呈现同步增长;同时,连续型和间歇型排水均能有效降低地下水位,使得包气带水分通量总体向下运行,土壤盐碱化得到有效控制。
[Abstract]:In order to improve the salinized soil and develop the shallow salt water resources reasonably, taking the salinized soil and the shallow groundwater of North China as the research object, by establishing the Hydrus-Modflow coupling model, using the measured soil and meteorology in the horizontal well test area, Based on the data of pumping test, the dynamic characteristics of groundwater table under different drainage modes in horizontal wells are discussed. The results show that the evaporation depth of groundwater in the test area is about 2.5 m under the natural condition, and the control standard is to reduce the groundwater level to the critical depth. A single horizontal well can control the land area of about 6.67 hmm2, and the control range increases synchronously with the annual pumping capacity. At the same time, both continuous and intermittent drainage can effectively reduce the groundwater level and make the water flux of the aeration zone run downward. Soil salinization was effectively controlled.
【作者单位】： 吉林大学环境与资源学院;中国地质调查局水文地质环境地质调查中心;河北地质大学水资源与环境学院;
【基金】：中国地质调查局地质调查项目(12120113103300,121201012000150018)
【分类号】：S156.4
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本文编号：2045186