Evapotranspiration (ET) is a central flux in the hydrological cycle. Various approaches to compute ET via energy balance models exist, but their handling is often complex and challenging. We developed QWaterModel as an easy-to-use tool to make ET predictions available to broader audiences. QWaterModel is based on the DATTUTDUT energy balance model and uses land surface temperature maps as an input. Such maps can e.g. be obtained from satellite, drone or handheld camera imagery. In the present study, we successfully tested QWaterModel for predicting ET in a tropical oil palm plantation against the well-established eddy covariance method. QWaterModel is compatible with all versions of QGIS3 and is available from the official QGIS Plugin Repository.

蒸散量（ET）是水文循环中的中心通量。存在多种通过能量平衡模型计算ET的方法，但是它们的处理通常是复杂且具有挑战性的。我们开发了QWaterModel作为易于使用的工具，使ET预测可供更广泛的受众使用。QWaterModel基于DATTUTDUT能量平衡模型，并使用地表温度图作为输入。这样的地图可以例如从卫星，无人驾驶飞机或手持摄像机图像获得。在本研究中，我们针对成熟的涡度协方差方法成功地测试了QWaterModel以预测热带油棕种植园中的ET。QWaterModel与所有版本的QGIS3兼容，并且可以从官方的QGIS插件存储库中获得。