中文摘要：

地下径流退水过程是水文过程的重要组成部分.选择滦河水系2个子流域（柳河流域和瀑河流域）的几场地下径流的退水过程,通过图形分析初步确定了2个子流域地下径流的退水规律,计算了地下径流的退水常数.并通过模型模拟的方法计算了模型模拟的误差,比较了几种模型模拟结果的优劣.结果表明,柳河流域地下径流服从指数退水规律,瀑河流域地下径流服从线性水库退水规律,且不同的降雨类型对应的退水常数不同.研究流域的地下径流退水过程,可为流域洪水过程的基流分割和地下径流的汇流计算提供依据.

英文摘要：

Groundwater recession flow process is an important component of the hydrological processes,and groundwater recession flow processes in the two sub-basins of Luanhe—Liuhe and Baohe have been studied.The law of groundwater recession flow in the two sub-basins has been determined through graph analysis and recession constants have been calculated.Simulation results of three recession models have been compared in analysis of their simulation errors.The results show that the groundwater recession flow in Liuhe follows the law of exponential model,while that in Baohe follows the law of linear reservoir model.In addition,recession constant varies with precipitation type.The research of groundwater flow recession processes can serve as the basis for runoff separation and groundwater flow routing in flooding processes.