摘要:
通过对丁旗地下河同一投放点同时开展二元示踪试验,探讨了当前被忽略的不同示踪剂应用对比及回收率合理性等问题.在淤泥沉积的地下河管道及流量和浊度稳定条件下,得出主要结论:(1)荧光素钠、罗丹明B回收率分别为53.91%和40.72%,前者比后者少损失13.19%;其中荧光素钠在主峰和缓慢衰减段排出量分别占85.03%和14.97%,罗丹明B则对应为65.88%、34.12%;(2)荧光素钠对应峰值的回收强度为罗丹明B的2.95倍且最大峰值出现时间比后者提前2 h;(3)罗丹明B由于吸附等形成的浓度曲线对管道结构分析有可能产生误导,荧光素钠则相对更准确.
Abstract:
The study area is located in the upstream Dabang river,a branch of the Beipanjiang river in Dingqi town,Zhenning county,Guizhou Province.The strata of this place comprise lower Triassic limestone,dolo-mite and landform,with landforms of dissolution hills and valleys.It hosts underground rivers A19,A30 and A10,with silt deposits and buried depths less than 30 m.This study focused on the comparison of tracer experiments for two materials of Uranine and Rhodamine B,and discussion on the rationality of the recovery rates by the two methods.The results show that,(1 )The recovery rate of Uranine is 53.91%,which is higher than Rhodamine B of 40.72%;(2)Uranine's recovery intensity for maximum concentration is 2.95 times than that of Rhodamine B;(3)It is relatively easy to notice some complete wave crests in the attenua-tion section of the Rhodamine B concentration curve.It is concluded that,(1)in the underground rivers with silt deposition,Uranine and Rhodamine B have higher adsorption rates,and there may be some problems in the tracer test technology with higher recovery rates;(2)For the analysis of conduit structure or hydrogeo-logical conditions,Uranine is superior to Rhodamine B;(3)The accuracy of recovery rates depends on fluo-rimeter calibration,flow monitoring,and closely related to environmental factors,such as water-turbidity and sediments.
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