When the quantity of incoming sand is larger than the capacity of sand transportation, the channeldegradation occurs;
当宋沙量小于输沙能力时，河床发生冲刷；
2
Forcing a cool material to flow can generate excessive shear energy and localized degradation in the screw's flow channel.
强迫一种冷的材料流动会产生极大地剪切能，并在螺杆的流道中产生降解。
3
In this paper, the mechanism of performance degradation due to above mentioned factors is analysed, and an effective method of compensation for channel mismatching and mutual coupling is proposed.