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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。Abstract: 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.
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图 1 流线畸变现象(董海洲等，2000)
Figure 1. The distortion phenomenon of flow line (Dong et al.,2000)
图 5 清水试验时光电流随时间变化情况
Figure 5. The variation of photocurrent with time in clean water test
图 6 不同开孔率条件下流场畸变系数随渗透流速的变化
Figure 6. The change law of distortion coefficient with seepage velocity under different open porosity
图 7 不同渗透流速条件下流场畸变系数随测孔孔径的变化
Figure 7. The change law of distortion coefficient with drilling diameter under different seepage velocity
图 8 不同测孔孔径条件下流场畸变系数随开孔率的变化
Figure 8. The change law of distortion coefficient with drilling diameter under different open porosity
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