泉域边界位置及边界性质的准确确定是建立正确的水文地质概念模型的重要前提,是泉域地下水资源量计算结果可靠性的根本保证。本文针对当前趵突泉泉域的边界争议,利用数值模型对断裂—分水岭边界性质进行研究,并采用水量均衡法和数值法两种方法,对两种边界条件下的水均衡进行计算,结果表明：在对断裂—分水岭边界确定的趵突泉泉域进行数值模拟时,需要充分考虑地表水与地下水之间密切的水力联系以及两者之间的转化关系,对降水入渗补给量进行合理折算,提高水均衡计算的准确性。两种边界条件下,趵突泉泉域水均衡情况差异较小。水量均衡法结果表明断裂边界泉域与断裂—分水岭边界泉域的均衡差分别为3626.0万m³/a和3061.4万m³/a；而利用数值法,均衡差分别为4467.1万m³/a和3699.6万m³/a。本研究结果可以推进趵突泉泉域边界条件的研究,为趵突泉泉域建立正确的水文地质概念模型提供了科学依据。

The accurate determination of the location and properties of the boundary of the spring basin is an important prerequisite for establishing a correct hydrogeological conceptual model and a fundamental guarantee for the reliability of the calculation results of the groundwater resources in the spring basin .Aiming at the boundary dispute of Baotu Spring basin, this paper uses numerical model to study the properties of fault-watershed boundary, and uses two methods of water balance method and numerical method to calculate the water balance under two boundary conditions. The results show that in numerical simulation of Baotu Spring basin with fault-watershed boundary, the close hydraulic relationship between surface water and groundwater as well as the conversion relationship between them should be fully considered, and the amount of precipitation infiltration supply should be converted reasonably, so as to improve the accuracy of water equilibrium calculation. Under the two boundary conditions, the water equilibrium in Baotu Spring basin is less different. The results of the water balance method show that the isostatic differences between the fracture boundary spring domain and the fracture watershed boundary spring domain are 36.26 million m_³/a and 30.614 million m_³/a respectively. By using the numerical method, the equilibrium difference is respectively 44.671 million m_³/a and 36.996 million m_³/a. The results of this study can promote the boundary conditions of Baotu Spring basin and provide a scientific basis for establishing a correct hydrogeological conceptual model for Baotu Spring basin.