The reservoirs is abstracted as a semicircle model and on this basis to build a delay equation about the wave of water in the paper in which space radius and time are variables,and then get the formulas of water wave amplified in the various depths.

On the basis of multiphase flow theory,a numerical model for waterair two-phase flow was proposed,to simulate the unsteady seepage problems in bank slope induced by water level fluctuation.

From the basic differential equation of surge tank and water level fluctuation law of surge tank,an exact implicit formula for calculating the first and second surges in the throttled upper chamber surge tank following load rejection was derived.

Influence of water quality fluctuation of Huanghe River on power plants and relevant operational countermeasures;

The hydraulic factors caused by the fluctuation flow and the filter mechanism of the geotextile filter of sea embankment are researched.

Based on analytical method,the paper shows that raising the length of a riser can elevate the water-hammer pressure and reduce the fluctuation of water level effectively in surge tank.