UCODE是美国地质调查局(USGS)为地下水模型逆问题求解开发出的一套通用求解程序,可以与各种过程模型(有限元femwater或有限差modflow等等)耦合使用。它采用修正的Gauss-Newton法对逆问题进行求解,并在求解过程中引入摄动敏感度,同时master-slave协议的加入为程序提供了卓越的并行计算能力。该文简单介绍UCODE程序的功能及使用,并结合具体算例讨论UCODE在反求水文地质参数中的应用。 UCODE is a set of universal solution programs developed by the US Geological Survey (USGS) for solving groundwater model inverse problems and can be coupled with various process models (finite element femwater or finite difference modflow, etc.). It uses a modified Gauss-Newton method to solve the inverse problem and introduces perturbation sensitivity in the solution, while the addition of the master-slave protocol provides excellent parallel computing power for the program. This article briefly introduces the function and use of UCODE program, and discusses the application of UCODE in reverse seeking hydrogeological parameters with concrete examples.