游荡河型造床实验过程中河型的时空演替和复杂响应现象

运用过程响应模型实验方法,在游荡型模型小河塑造过程中,分析了游荡河型发育过程中出现的时间和空间演变过程,发现其时、空演替过程可以相互替代,从而在实验室内证实了空代时假说的存在性,为空代时假说提供了新的证据。并据此把复杂响应过程分为时间复杂响应过程和空间复杂响应过程,分析了游荡河型发育过程中出现的时空复杂响应现象。

An experimental study on spatial and temporal processes and complex response of river channel evolution

Based upon the experimental study on bed making of wandering braided river channel by using process response model method, both the spatial and temporal channel evolution processes are analyzed. It is found out that the spatial and temporal processes can substitute each other by comparing the horizontal processes and the variations of variables of river channel system. Thus, the existence of ergodic hypothesis in laboratory which provides a new evidence for the hypothesis. Based upon this finding, the complex response can be subdivided into spatial complex response and temporal complex response according to the objective situation, and the concept of temporospatial complex response is consequently put forward and verified with the experimental data. In fact, S.A.Schumm and Jiongxin Xu have only studied the temporal complex response, but rarely mentioned the spatial complex response. Experimental study illustrates that there is a temporal complex response in the same region at different stages and a spatial complex response at the same time in different regions under certain conditions. Temporal complex response is often and firmly related to spatial ones and can be substituted for another one according to the ergodic hypothesis, and vice versa. It is so called temporospatial complex response.