近日，汕头大学赖忠平团队揭示了由于冰川海平面下降，大河向上游切割。该项研究成果发表在2025年6月27日出版的《科学进展》杂志上。

海平面变化是低地河流系统的重要驱动力。虽然它的影响被认为延伸到内陆数百公里，但这种影响通常被认为仅限于三角洲地区。研究组对长江中游江汉平原岩心进行了发光测年，证明了最后一次冰川驱动的海平面下降对内陆1000多公里的影响。发光年龄揭示了约26000至约17000年前（ka）的一个常见沉积间断，反映了海平面下降引发的>35米的河流切割。 

在~17至~9 ka的冰消期，这些切割山谷内发生了随后的快速沉积，之后沉积速度减慢。对全球大陆河流的进一步综合表明，海平面变化会影响比普遍认识的更上游的大型低梯度低地河流系统，扰动后的地貌平衡在与第四纪冰川周期长度相当的时间尺度内达到。

附：英文原文

Title: Headward incision of large rivers in response to glacial sea level fall

Author: Zhongping Lai, Yuexin Liu, Ziyuan Wu, Yantian Xu, Zibin Fang, David R. Montgomery

Issue&Volume: 2025-06-27

Abstract: Sea level change is an important forcing on lowland fluvial systems. Although its impact is suggested to extend up to hundreds of kilometers inland, this impact is often considered confined to deltaic regions. We present luminescence dating of cores from the Jianghan Plain in the middle Yangtze River that demonstrates the influence of the last glacially driven sea level fall extended over 1000-kilometers inland. Luminescence ages reveal a common sedimentary hiatus from ~26 to ~17 thousand years ago (ka), reflecting fluvial incision of >35 meters triggered by sea level fall. Subsequent rapid aggradation occurred within these incised valleys during deglaciation between ~17 and ~9 ka and then slowed down afterward. A further synthesis on global continental rivers shows that sea level change affects large, low-gradient lowland fluvial systems farther upstream than generally recognized, with postperturbation geomorphologic equilibrium reachable in timescales comparable to the length of Quaternary glacial cycles.

DOI: adr5446

Source: https://www.science.org/doi/10.1126/sciadv.adr5446