河渠影响下土壤水-地下潜水联合运动的模拟研究

Simulation research on the conjoined movements of soil water subsurface unconfined water under influenced of river or channel

本文以饱和非饱和流理论为基础，将非饱和土壤水与地下潜水作为一个整体进行研究，进而描述了灌溉河渠地表水与土壤水及地下潜水相互影响的形势．有限单元均衡的数值方法吸收了一般有限元法及有限差分法的优点．同时又体现了质量守恒原则，用于渗流方程的求解时更具有物理基础．本文还探讨了该法应用于渗流场计算时流速分布及断面物质通量的计算处理，对工程实际中的土壤水分滞后效应、变动边界条件及自由渗出面等难点也作了有益的探索，从而增强了饱和非饱和理论的应用性．

ased on the theory of saturated unsaturated flow, this paper presents some research on the soil water and subsurface unconfined water treated as a whole the inter dynamic relation ship between the soil water, subsurface unconfined water and the surface water in a river or channel is investigated. Finite Element Balance Method has been used. It tallies with the Material Balance Law possesses a solid basis for being applied in solving seepage flow equations. Application of this method in calculating the distribution of flow velocities and the material flux in the seepage field is discussed. Some plausible studies for key problems in the practicable engineering such as soil water retardation effect, unstable boundary conditions and free seepage face etc are also revealed. It is expected to get the samrated unsaturated flow theory to a higher level of application.