为探讨闸控型湖泊水量平衡中湖水与地下水相互作用的贡献及其时间变异性，以长江中游洪湖为例，基于洪湖和地下水水位动态变化分析、水量平衡模型计算，识别并计算洪湖与地下水之间的补排关系和交换量，揭示了洪湖与地下水交互在湖泊水量平衡中的贡献及其时间变异特征。结果表明：洪湖与地下水具有明显水位差，两者动态变化显著正相关，相关系数r为0.729，且洪湖区域潜水含水层具有透水性，表明洪湖与地下水之间具备交互条件；2017—2022年年际尺度上，总体表现为洪湖向地下水排泄，多年平均排泄量为6.43×10⁸ m³，占洪湖出湖水量的14.11%；2017—2022年多年平均月尺度上，枯水期（9月—次年2月）洪湖向地下水排泄，平均月排泄量为0.8×10⁸ m³，丰水期（4—8月）洪湖与地下水交互处于动态变化状态，月交互量范围为-1.17×10⁸~0.88×10⁸ m³。洪湖与已报道的鄱阳湖、洞庭湖等通江湖泊呈现出相反的湖水-地下水交互季节性变化特征，主要是由于洪湖水位受水利调度影响改变了湖泊-地下水自然交互过程。研究结果为湖泊和地下水相互作用研究补充了新认识，对洪湖水资源和水生态环境保护管理具有重要指导意义。

To investigate the contribution and temporal variability of lake-groundwater interactions in the water balance of flood-controlled lakes, Honghu Lake in the middle reaches of the Yangtze River was selected as a case study. Based on the analysis of water level dynamics of Honghu Lake and surrounding groundwater, the recharge-discharge relationship between Honghu Lake and groundwater were identified and calculated by a water balance equation. The contribution of groundwater-lake interactions to the water balance of Honghu Lake and its temporal variability were examined. The results indicate that there is a significant water level difference between Honghu Lake and the adjacent phreatic groundwater, with dynamic changes in both showing a significant positive correlation, correlation coefficient r = 0.729. The aquifer in the Honghu Lake area is permeable, which indicates that there are interaction conditions between Honghu Lake and groundwater. On an inter-annual scale from 2017 to 2022, Honghu Lake generally infiltrate into the groundwater, with an average annual discharge volume of 6.43 × 10⁸ m³, accounting for 14.11% of the lake's outflow. On a multi-year average monthly scale from 2017 to 2022, Honghu Lake infiltrates into the groundwater during the dry season (September to February of the following year), with an average monthly discharge volume of 0.8 × 10⁸ m³. During the rainy season (April to August), groundwater-lake interactions are dynamic, with an average monthly exchange volume of -1.17 × 10⁸ ~ 0.88 × 10⁸ m³. Honghu Lake presents an opposite seasonal variation characteristic of the lake water-groundwater interaction compared with the reported Yangtze-connected lakes such as Poyang Lake and Dongting Lake. This is mainly because the water level of Honghu Lake, affected by water conservancy regulation, has altered the natural interaction process between the lake and groundwater. These findings provide new insights into groundwater-lake interactions in flood-controlled lake systems and hold significance for the management of water resources and ecological protection in the Honghu Lake region.