Based upon the experimental study on bed-making of wandering-braided river channel with an approach of process-response model, both spatial and temporal processes in the channel evolution are analyzed. The spatial and temporal processes can substitute for each other in the river channel evolution by analyzing the horizontal processes and the variation of variables of river channel system. Thus, the existence of ergodic hypothesis is newly and firmly rectified in the laboratory. By this finding the complex response can be divided into temporal complex response and spatial one according to the objective situations concerned, and the concept of the spatial and temporal complex response is consequently put forward and rectified with the experimental data.
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