The Supraśl River is a stable water ecosystem in North-Eastern Poland. This is indicated by the flow rate over many years, as well as the water quality monitored for years. Despite this, there are periods of oxygen deficiency in the water, causing massive fish kills. Our research shows that climate change resulting in an increase in the frequency of hydro-meteorological extremes may contribute to negative processes taking place in aquatic ecosystems. On the example of Supraśl Water System (SWS), we present an analysis of the phenomenon of suspension caused by the underground inflow, supplying the surface waters with a significant load of organic matter. The accelerated decomposition of peat formations in the Supraśl River catchment after heavy rains makes it easier for organic matter to penetrate into the aquatic ecosystem. Intensive flushing of valley and river bed sediments during summer floods has a particularly negative impact on the ecosystem of inland waters. If there are organic sediments on the bottom, their re-suspension is very dangerous. Then there is the immediate demand for oxygen, which can lead to deoxygenation of the water. Although this is a natural process, alarm and monitoring procedures should be established and countermeasures sought to respond in time and prevent mass fish kills.

苏普拉希尔河是波兰东北部稳定的水生态系统。这是通过多年的流量以及多年监测的水质来表明的。尽管如此，水中有时会缺氧，导致大量鱼类死亡。我们的研究表明，气候变化导致水文气象极端事件发生频率增加，可能会导致水生生态系统发生负面过程。以 Supraśl 水系统 (SWS) 为例，我们分析了地下流入引起的悬浮现象，为地表水提供了大量的有机物。大雨过后，苏普拉希尔河流域泥炭地层加速分解，使得有机物更容易渗透到水生生态系统中。夏季洪水期间对山谷和河床沉积物的强烈冲刷对内陆水域的生态系统造成特别负面的影响。如果底部有有机沉积物，它们的重新悬浮是非常危险的。然后立即需要氧气，这可能导致水脱氧。尽管这是一个自然过程，但应建立警报和监测程序，并寻求对策以及时应对并防止大规模鱼类死亡。