【摘要】 通过试验确定了标准砂中常用有色示踪剂高锰酸钾吸附类型.通过数字成像方法监测了静水条件下标准砂中高锰酸钾和亮蓝的吸附过程,并对数字图像进行了高斯模板处理.利用该处理结果对吸附过程进行了对比,同时还对比了相同浓度高锰酸钾溶液在静止和流动条件下被砂粒吸附的状况.根据对比结果确定了2种常用有色示踪剂对溶质运移试验的适用性.结果表明:高锰酸钾的吸附虽为线性吸附,但和新型示踪剂亮蓝相比,达到吸附稳定所需的时间过长,在低速水流条件下更为明显;对于需考虑吸附影响的运移试验,高锰酸钾并不适用,而亮蓝的使用则能加速试验进程.更多还原

【Abstract】 The applicability of the two dye tracers was discussed based on their adsorption characteristics in standard sand.The adsorption type of KMnO4 in standard sand was determined by experiments.The adsorption processes of the two dye tracers in standard sand under hydrostatic condition were monitored by the digital imaging method,and the processes were compared by treatment of the obtained images with Gaussian template.Moreover,the adsorptions of KMnO4 solute to sand grains both under hydrostatic and flow conditions were also compared.According to the result,the applicability of the two dye tracers commonly used in solute transport experiments was verified.As a commonly used tracer,KMnO4 is of linear adsorption characteristic,and its adsorption time is too long as compared with that of brilliant blue,especially at low flow velocity.Therefore,KMnO4 is not suitable for the transport experiments in which adsorption effect should be considered;while,the use of brilliant blue can accelerate experiments.更多还原