The low level south-west jet stream supported enough heat,momentum and water vapor;the coupling of the second circulation of the upper level,low level and front enhanced the convergence at the low level and divergence at the upper level,and also provided the .

The result show that,the physical reason of the process are due to the coupling action of the high jet stream and the low jet stream,strong vapour transport,the accumulate and release of the huge instability energy.

Analysis to the weather process of snowstorm from 27 to 28 September in 2003 happened in Urumqi showed that snowstorm event resulted from of the interaction of the northern transversal trough 、high、middle、low-lever jet and northern cold-air under the condition that the Lran subtropical high northward rising and Europe high pressure ridge overlapped.

The influences of different orogaphy, intensity and location of Jet, intensity of the eastward moving trough (EMT) itself and the baroclinic intensity of the basic westerly on the EMT are showed as well.

Hydraulic computation of the shock wave of supercritical flow in divergence zone;

The shock wave in supercritical flow caused by riverside deflection angle are analysed.

Based on the analysis on the characteristic of disturbance of rapid flow shock wave in sloping channel and some methods of avoiding the shock wave influenc.

The regime of rapid flow in sharp open-channel bends is described,which shows that the flow near concave bank in sharp openchannel bends is subjected to centrifugal force and impact force.

The rapid flow of flood tide makes the construction very difficulty, leading to the breaking of piles.

Fast-convergent computational method for torrent shock wave under subcritical angle condition;

According with the examples of the misfire in the underwater blasting, various kinds of potential dangerous which can lead to misfire are introduced in the course of deep water blasting among complicated environment of geological topography, vortex, torrent and deep water.

Under this situation, the flow, when it is the torrent through the channel, will be disturbed due to the variations of the trough wall deflection;therefore, at the downstream will appear a series of rhombic disturbed waves called torrent shock waves.