To understand the mechanism of simultaneous drainage event related to supraglacial lakes on a debris-covered glacier, we investigated water-level variations of supraglacial lakes on the southern Inylchek Glacier in Kyrgyzstan. To examine these variations, we used daily aerial images for 2017–2019 from an uncrewed aerial vehicle that were converted to 15 cm-digital surface models and ortho-images. Our main results are as follows: (1) When one lake drained, the water levels of other lakes simultaneously increased, indicating that drainage water is shared with several lakes through a main englacial conduit. In one drainage event, a branched off englacial conduit clearly connected to a main englacial conduit. (2) Sometimes several lakes discharged simultaneously, indicating that several lakes had connected to a main englacial conduit that had opened. Such cases can cause larger-scale drainage than that from the opening of a branched off englacial conduit. (3) Simultaneous drainage occurred twice in the same year, each time through a different conduit, indicating that the main englacial conduit can be abandoned and reused. (4) In some lakes, the water level on the hydraulic gradient line increased gradually with nearly the same increase rate just before drainage. Such an increase may be an indicator of a possible simultaneous drainage event.

为了了解与碎片覆盖的冰川上冰上湖泊相关的同时排水事件的机制，我们调查了吉尔吉斯斯坦南部 Inylchek 冰川上冰上湖泊的水位变化。为了检查这些变化，我们使用了 2017-2019 年来自无人驾驶飞行器的每日航拍图像，这些图像被转换为​​ 15 厘米数字表面模型和正射图像。我们的主要结果如下：（1）当一个湖泊排水时，其他湖泊的水位同时增加，表明排水通过主要的冰河管道与多个湖泊共享。在一次排水事件中，一条分叉的冰河管道明显连接到一条主要的冰河管道。(2) 有时有几个湖泊同时出水，表明几个湖泊与一条已经开通的主要冰川管道相连。这种情况会导致比从分支的冰川管道开口更大规模的排水。(3) 同一年发生两次同时排水，每次通过不同的管道，表明主要的冰河管道可以废弃和再利用。(4)在一些湖泊中，水力坡度线上的水位逐渐升高，在排水前的升高速度几乎相同。这种增加可能是可能的同时排水事件的指标。水力梯度线上的水位逐渐上升，上升速度与排水前几乎相同。这种增加可能是可能的同时排水事件的指标。水力梯度线上的水位逐渐上升，上升速度与排水前几乎相同。这种增加可能是可能的同时排水事件的指标。