陆面过程模式中地下水位的参数化及初步应用

田间研究表明地表水和地下水有重要的相互作用,它与土壤含水量密切相关.土壤含水量不仅在陆气相互作用系统水和能量平衡中,而且在干旱、洪水预报、水资源管理、生态系统研究中起十分重要的作用.因此,研究地表水和地下水的相互作用,建立陆面模式中地下水位的动态表示,对于气候与水资源研究具有重要意义.将地下水位的动态表示问题归结为饱和与非饱和流问题,发展了其数值计算方案,建立了地下水位的动态表示,并与陆面过程模型耦合,建立了陆气相互作用中地下水位的动态表示,并进行了数值模拟研究.

A Parameterization of Groundwater Table in a Land Surface Model and Its Applications

Field observations have shown that there are important interactions between surface water and groundwater which are closely related to the state of soil moisture. Soil moisture plays an important role not only in the energy and water budgets in the land atmosphere system, but also in the drought and flooding, the water resources management, ecological system, and water quality studies. Hence, studies on the interactions and dynamic representations of groundwater table in a land surface model are of significance on climate and water resources. We present a new numerical model for dynamic representation of groundwater table by using the mass lumped finite element method through reducing it to a moving boundary problem on saturated and unsaturated zone, which is coupled with a land surface model VIC. Numerical simulations shows good agreement between the ground well observations and the simulated groundwater tables that are obtained from the combination of the newly developed model and VIC.