The evolution of water temperature at the stream–aquifer interface and the associated heat fluxes have a major influence on the ecological state. Here, a synthetic case is developed to characterize the behavior of the stream–aquifer interface submitted to meteorological and hydrological forcings as well as to various hydraulic and thermal properties, representative of a wide range of lithofacies from clay to gravel/sand. The thermal regime of the stream–aquifer system is driven by two pseudo-periodic cycles: the annual cycle and the diurnal cycle. A thermo-hydrogeological model coupled with a parameter sampling script is used. The results highlight the drivers that have the greatest influence on heat fluxes: (1) the meteorological conditions through the seasonal thermal gradients established between the stream and the aquifer during winter and summer periods, and (2) the hydraulic conductivity at the stream–aquifer interface. Depending on the hydraulic conductivity values at the stream–aquifer interface, two thermal regimes exist: for high hydraulic conductivities, advective fluxes clearly prevail, while for lower hydraulic conductivities, conductive fluxes predominate in most cases. This depth is reduced in upwelling cases and modulated by the thermal regime. The predominance of either the streambed- or aquifer-property effects depends on the equivalent hydraulic conductivity. In downwelling conditions under a given meteorological setup, stream–aquifer disconnection leads to increased advective fluxes compared with its connected counterpart. Results from this study provide better insight into heat fluxes at the stream–aquifer interface, which will ultimately result in a better stream heat-balance model.

溪流－含水层界面水温的演变以及相关的热通量对生态状态产生重大影响。在这里，开发了一个合成案例来描述流水-含水层界面在气象和水文强迫以及各种水力和热力性质方面的行为，代表了从粘土到砾石/砂石的各种岩相。流-含水层系统的热力状态由两个伪周期周期驱动：年周期和日周期。使用结合参数采样脚本的热水文地质模型。结果突出显示了对热通量影响最大的驱动因素：（1）通过冬季和夏季期间溪流与含水层之间建立的季节性热梯度的气象条件，以及（2）溪流-含水层界面的水力传导率。根据流-含水层界面的水力传导率值，存在两种热状态：对于高水力传导率，显然对流通量占优势，而对于水力传导率较低，大多数情况下传导性通量占主导。在上升流情况下，该深度减小，并由热力状态调节。流床性质或含水层性质的影响主要取决于等效的水力传导率。与给定的气象条件相比，在给定的气象条件下的下降流条件下，流水层的断开导致对流通量的增加。