基于超熵产生的河型稳定判别式

基于非平衡态热力学理论中的超熵产生研究河型的稳定性,对河型是否有可能转化做出定量判别分析。选择河流系统的广义力和广义流,构造出河流的超熵产生以及超能耗率,根据超能耗率推导出河型稳定判别式。应用该判别式分析了黄河下游5个河段3种不同河型的稳定性,计算结果表明这5个河段的河型是稳定的,近期没有发生河型转化的可能性,与实际情况相符。利用该河型稳定判别式,不仅可判别河型的稳定性,还可以预测河流调整方向,为河流整治工程提供科学依据。

Discriminant of stability for channel pattern based on excess entropy production

Based on excess entropy production of non-equilibrium thermodynamics, the discriminant of the stability for channel pattern is studied, and change of river pattern can be quantitatively analyzed. Once the generalized forces and the corresponding generalized flux of river are formed, excess entropy production and excess energy dissipation rate can be obtained. Based on excess energy dissipation rate of river, the discrimination of channel pattern stability is obtained. According to the discriminant, the stability is ana-lyzed for 5 reaches with 3 different channel patterns on the lower Yellow River. The results show that the channel patterns of 5 reaches are stability and there is no possibility of the change of river patterns,consis-tent with the actual situation, recently. Using of discriminant of channel pattern's stability, not only the stability of channel pattern can be determined, but also the adjustment of the channel pattern can be fore-casted. It provides a scientific basis for river training.