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地下水渗流荧光单孔测速流场畸变系数的试验研究

EXPERIMENTAL STUDY ON DISTORTION COEFFICIENT OF SINGLE-HOLE FLUORESCENCE PHOTOELECTRIC METHOD FOR GROUNDWATER SEEPAGE MONITORING
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摘要 荧光光电法作为地下水单孔渗流监测的重要手段,而流场畸变系数合理取值是荧光单孔渗流监测的关键。为有效提高荧光光电法在地下水单孔渗流测速的准确率,开发设计了荧光单孔地下渗流模型的监测试验系统,分析研究不同渗流条件下的流场畸变系数。首先,依据单孔稀释模型推导了荧光光电法流场畸变系数的数学表达式;然后根据自制光电监测装置,开发设计了荧光单孔渗流监测系统的试验装置;最后通过研究荧光剂稀释过程中的光电强度变化来研究不同含水层、侧孔孔径和开孔率条件下流场畸变系数的变化规律,确定不同监测条件下流场畸变系数的取值范围。试验结果表明:流场畸变系数随渗透流速和滤管开孔率的增加而增加,随测孔孔径的增大而减小,且影响因子重要性为含水层>测孔孔径>开孔率。以上研究成果可为荧光单孔地下水渗流监测的实际工程应用提供有益借鉴。 The fluorescence photoelectric monitoring is an important method for monitoring groundwater seepage.The value of distortion coefficient is the key to single-hole fluorescence photoelectric monitoring.This paper aims to systematically study the distortion coefficient with different seepage conditions.It designs a test apparatus of seepage monitoring system to monitor the groundwater seepage.First,the mathematical expression of the distortion coefficient for the fluorescence photoelectric method is derived on the basis of the single-hole dilution model.According to homemade photoelectric monitoring device,a test apparatus of seepage monitoring system is then designed to monitor the groundwater seepage.Finally,the variation law of distortion coefficient is studied with different permeability velocity values,single-hole aperture and opening rate.The experimental results show that the distortion coefficient increases with the aquifer and opening rate,but decreases with the aperture of single-hole.What s more,the importance of the influencing factor follows the regulation of the aquifer>the single-hole aperture>the opening rate.The above research results provide a useful reference for the engineering application of single-hole fluorescence photoelectric method in monitoring groundwater seepage.
作者 蔡征龙 孟永东 李方方 缪蕊 田斌 田爽岑 CAI Zhenglong;MENG Yongdong;LI Fangfang;MIAO Rui;TIAN Bin;TIAN Shuangcen(National Field Observation and Research Station of Landslides in Three Gorges of Yangtze River,China Three Gorges University,Yichang 443002,China;College of Water Conservancy and Environment,China Three Gorges University,Yichang 443002,China)
机构地区 三峡大学 三峡大学
出处 《工程地质学报》 CSCD 北大核心 2023年第5期1711-1718,共8页 Journal of Engineering Geology
基金 国家重点研发计划项目(资助号:2017YFC1501100) 国家自然科学基金重点项目(资助号:51939004).
关键词 地下水 渗流监测 荧光光电法 单孔稀释模型 畸变系数 Groundwater Seepage monitoring Fluorescent photoelectric method Single-hole dilution Distortion coefficient
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