The first one is a faster phase and indicates the immediate response of the SCC to the changes of runoff.The second one is a slower phase and shows the dynamic effect is leading to the steady state.

• 泥沙输移动力学过程的瞬态可以区分为对来水来沙条件改变作出快速响应的快瞬态和在稳定水沙条件下的趋向于稳态的缓慢过程，即慢瞬态。