近日，中国地质大学（北京）付广裕团队研究了青藏高原东南缘弯曲均衡与河道流动动力学。2026年3月30日出版的《大地测量与地球动力学》杂志发表了这项成果。

青藏高原东南缘通道流的空间分布近年来备受关注。已有研究采用不同地球物理方法描述了通道流的不同表现形式。

研究组利用挠曲均衡方法探讨了通道流问题。采用Fan小波方法，计算了重力与地形数据之间的相关性，即导纳和相干性。基于模拟数据，针对自由空气重力异常和布格重力异常的导纳与相干性的不同组合进行了反演实验。结果表明，自由空气与布格重力异常相干性的联合反演能够恢复地壳内部载荷比的最优分布，该参数量化了均衡调整过程中内部密度界面载荷的贡献，指示了下地壳的通道流，并解释了地壳隆升。

通过融合实测数据与模型数据，研究组获得了青藏高原东南缘新的自由空气和布格重力异常场。进一步将联合反演方法与数字高程模型及融合后的重力异常数据相结合，反演了下地壳内部载荷比的分布。结果显示，通道流围绕东喜马拉雅构造结发生顺时针旋转，自青藏高原内部向其东南缘迁移。

附：英文原文

Title: Flexural isostasy and channel flow dynamics at the southeastern margin of the Qinghai–Xizang Plateau

Author: Guangyu Fu b

Issue&Volume: 2026/03/30

Abstract: The spatial distribution of the channel flow in the southeastern margin of the Qinghai-Xizang Plateau has received significant attention in recent years. Previous studies have employed different geophysical methods to describe the different forms of channel flow. In this study, channel flow is examined using the flexural isostatic method. Using the Fan wavelet method, we calculate the correlation between gravity and topographic data, namely the admittance and coherence. Inversion experiments are conducted on various combinations of admittances and coherences of Free-air gravity anomalies (FGAs) and Bouguer gravity anomalies (BGAs) using simulated data. The results show that the joint inversion of FGAs and BGAs coherences can recover the optimal distribution of the lower crustal internal load ratio, which quantifies the contribution of loading from the internal density interface during isostatic adjustment and indicates the channel flow at the lower crust, explaining crustal uplift. The new FGAs and BGAs field of the southeastern margin of the Qinghai-Xizang Plateau are derived by merging the survey and model data. The joint inversion method, combined with digital elevation and merged gravity anomaly data, is then used to invert the distribution of the lower crustal internal load ratio. The result indicates that the channel flow rotates clockwise around the eastern Himalayan syntaxis, migrating from the interior of the Qinghai-Xizang Plateau toward its southeastern margin.

DOI: 10.1016/j.geog.2025.12.010

Source: https://www.sciencedirect.com/science/article/pii/S1674984726000169