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鉴于衰减系数是流量衰减分析过程中的关键参数,在给出瞬时衰减系数、名义衰减系数定义的基础上,研究了两种衰减系数的时变特征,据此分析了后寨地下河系统实测流量(冒水坑站和老黑潭站)数据。结果表明,在全部衰减时间内,瞬时衰减系数整体上随时间增加而变小,在每一个衰减段内其数值也是整体变小的;瞬时衰减系数的第一衰减段变幅大于第二衰减段,第二衰减段大于第三衰减段;第一衰减段变化速度大于第二衰减段,第二衰减段大于第三衰减段;名义衰减系数与瞬时衰减系数具有类似的时变特征。
Considering that the attenuation coefficient is the key parameter in the process of flow attenuation analysis, the time-varying characteristics of two attenuation coefficients are studied based on the definition of instantaneous attenuation coefficient and nominal attenuation coefficient. Based on the analysis, the measured flow rate of Houzhai underground river system (Water puddle station and old Blackpool station) data. The results show that the instantaneous attenuation coefficient decreases with the increase of time in the whole decay time, and its value becomes smaller in each decay section as a whole. The amplitude of the first decay section of instantaneous decay coefficient is larger than that of the second decay section , The second attenuation section is greater than the third attenuation section; the first attenuation section changes speed is greater than the second attenuation section, the second attenuation section is greater than the third attenuation section; the nominal attenuation coefficient and the instantaneous attenuation coefficient have similar time-varying characteristics.