摘要
灌溉是农业生产中的重要环节,大量的田间水灌溉会诱发黄土滑坡等地质灾害,因此研究灌溉过程中田间水分入渗特征对于确定合理的灌溉制度与地区水资源管理具有重要意义。为研究灌溉水在田间的入渗特征,本文通过高密度电阻率法和土体含水率监测系统,在浸水试验过程中观测含水率和电阻率的变化情况,构建含水率和电阻率关系的模型,研究灌溉过程中水分入渗的空间变异性。结果表明,土体含水率随深度增加呈现先增大逐渐减小的趋势,在埋深30 cm处达到峰值。埋深小于1.5 m的土体电阻率受灌溉过程的水分入渗影响较大,随着水分入渗量增加,土体电阻率值减小。埋深大于3.5 m区域由于水分入渗微弱,土体电阻率变化不大。灌溉水在此处土体中的入渗深度约为3.0-3.5 m。构建的含水率和电阻率关系的对数模型θ=-6.681lnρ+54.59的相关性良好,误差较小,在水文地质调查中合理应用该模型可以得到含水率变化情况。
Irrigation is an important part of agricultural production,a large amount of field water irrigation will induce geological disasters such as loess landslides,so it is of great significance to study the characteristics of field water infiltration under the irrigation process to determine a reasonable irrigation system and regional water resources management.In order to study the infiltration characteristics of irrigation water in the field,the changes of moisture content and resistivity were observed during the immersion test by high density resistivity method and soil moisture content monitoring system,and a model of the relationship between moisture content and resistivity was constructed,and the spatial variability of water infiltration in irrigation process was studied.The results showed that the moisture content of the soil showed a tendency to increase and decrease gradually with the increase of depth,and reached a peak at the burial depth of 30 cm.The resistivity of soil with a buried depth of less than 1.5 m is greatly affected by the water infiltration of the irrigation process,and the resistivity value of the soil decreases as the amount of water infiltration increases.The area with a burial depth greater than 3.5 m does not change much due to the weak water infiltration.The infiltration depth of irrigation water in the soil here is about 3.0 to 3.5 m.The logarithmic modelθ=-6.681 lnρ+54.59 of the relationship between moisture content and resistivity is constructed,the model has a good correlation,and the calculation results has a minor error.The variation of moisture content can be obtained by applying this model reasonably in hydrogeological surveys.
作者
赵贵章
孔令莹
徐远志
潘登
王展
谢思敏
ZHAO Guizhang;KONG Lingying;XU Yuanzhi;PAN Deng;WANG Zhan;XIE Simin(North China University of Water Resources and Electric Power,Zhengzhou 450046,China;Water Resources Research Institute of Shandong Province,Jinan 250013,China;Natural Resources Monitoring and Land Consolidation Institute of Henan Province,Zhengzhou 450016,China)
出处
《华北水利水电大学学报（自然科学版）》
北大核心
2023年第2期24-29,共6页
Journal of North China University of Water Resources and Electric Power：Natural Science Edition
基金
中国地质调查局地质调查项目(DD20190354)
“一带一路”水与可持续发展科技基金资助项目(2021490511)
河南省自然资源厅科技项目(2019379137)。
关键词
电阻率
入渗
高密度电阻率法
含水率
对数模型
resistivity
infiltration
high density resistivity method
moisture content
logarithmic model
