This paper did some theoretical studies on water-ponding boundary model, and then applied the boundary model in SWMS_2D, which is a numerical model for simulating water flow and solute transport in two-dimensional variably saturated media.

Triangular elements are adopted to discretize the boundary of flow field, boundary integral method is chosen to solve the flow field and the evolution of bubble is simulated with Mixed-Eulerian-Lagrangian method.

The evolution of the bubble is solved by the boundary integral method,and the singularity of the double layer potential is eliminated by recasting the principal-value integral of the double-lay.

Based on the assumption of potential flow,the coupled numerical model of bubble and wall is built and the model is calculated with boundary integral method and three-dimensional computing program is developed.

In this paper boundary integral method is generalized to solve the problems of bending of thick rectangular plates based on Reissner s theory, this paper gives the closed analytical solution of the bending of thick rectangular plates under concentration bending moment and calculating results of practical values.

A discussion on determination of Jurassic in the northern part of Yanqi Basin sedimentary boundaries;