Along the eastern margin of the Qinghai–Tibet Plateau, there are frequent occurrences of strong tectonic movement and large-scale landslides. River blockages often occur in deep-cut river valleys, forming large-scale dammed lakes. In this study, a ~26.5 m thick lacustrine sedimentary profile that underlying the modern riverbed of the Yalong River is reported. Here, ¹⁴C dating results show that lacustrine deposition began at ~25 ka and continued till ~10 ka, mainly during the Last Glacial Maximum. Paleoclimatic indicators, such as particle size, magnetic susceptibility, and spore-pollen combination, were used to reconstruct the evolution process of the paleoenvironment in the study area, revealing that a paleo-flood event occurred at ~19 ka. The Tongzilin dammed lake contains an excellent record of the geomorphic evolution of the lower reaches of the Yalong River during the Last Glacial Maximum. Before 25 ka, the Yalong River experienced strong downcutting to form a deep valley, which created the space conditions for the formation of the dammed lake; from 25 to 10 ka, the dammed lake remained relatively stable, with dominating accumulation; and after 10 ka, the dammed lake broke and the river continued to downcut.

在青藏高原东缘，经常发生强烈的构造运动和大规模的滑坡。河流阻塞经常发生在深切的河谷中，形成了大型的堰塞湖。在这项研究中，据报道，亚龙河现代河床下有约26.5 m厚的湖相沉积剖面。来¹⁴C测年结果表明，湖相沉积开始于〜25 ka，一直持续到〜10 ka，主要在最后一次冰期期末。颗粒大小，磁化率和孢粉组合等古气候指标被用于重建研究区古环境的演化过程，揭示了约19 ka发生了古洪水事件。桐梓林堰塞湖记录了最后一次冰川最大时期雅long江下游的地貌演化。在25 ka之前，雅long江经历了强烈的冲降，形成了深谷，这为堰塞湖的形成创造了空间条件。从25到10 ka，该堰塞湖保持相对稳定，且蓄积占主导地位。10 ka之后