随着青藏高原向东北方向扩张,黄河源头水域正在缩小

IF 2.6 2区 地球科学 Q2 GEOGRAPHY, PHYSICAL
Yijia Ye, Xibin Tan
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引用次数: 0

摘要

印度-欧亚大陆碰撞之后,青藏高原及其周边地区出现了大范围的造山运动,并进一步影响了该地区的气候。构造活动和气候变化极大地影响了流域的演变。黄河发源于青藏高原中部,流经青藏高原东北缘。尽管对黄河源头地区的构造和地表过程进行了广泛研究,但该地区的排水演变及其控制机制仍存在争议。作为流域边界的排水分水岭,在受到构造和/或气候扰动后可迁移数千万年。因此,排水分界线的稳定性可以为排水演化提供新的独立约束。在本研究中,我们采用χ-图和 Gilbert 指标两种方法评估了黄河源头区周围排水分水岭的稳定性。结果表明,随着周边河流的蚕食,黄河源头区正在缩小。根据排水分异稳定性分析、数值模拟和前人研究,我们认为构造活动和气候变化对黄河源头地区的排水演变产生了深刻影响。黄河源头区的收缩主要是受晚新生代青藏高原向东北扩张的影响。与此同时,黄河源头地区日益平坦,这为沉积和周期性气候变化(如冰川周期)驱动的周期性解体和重新整合事件创造了条件。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
The Yellow River headwater is shrinking in response to the northeastward expansion of the Tibetan Plateau
Following the India-Eurasian collision, widespread mountain building has occurred in and around the Tibetan Plateau, and further influenced the regional climate. The tectonic activity and climate changes significantly affect the evolution of drainage basins. The Yellow River originates from the central Tibetan Plateau and flows through the northeastern margin of the plateau. Although the tectonic and surface processes in the Yellow River headwater area have been extensively studied, the drainage evolution in this region and its controlling mechanisms remain controversial. Drainage divides, which serve as the boundaries of drainage basins, can migrate for tens of millions of years after a tectonic and/or climatic disturbance. Therefore, drainage-divide stability can provide new and independent constraints on drainage evolution. In this study, we assess the stability of the drainage divide surrounding the Yellow River headwater area using two methods, χ-plot and Gilbert metrics. The result shows that the Yellow River headwater is shrinking as surrounding rivers encroach upon it. Based on the drainage-divide stability analysis, numerical simulation, and previous research, we suggest that both tectonic activity and climate changes have profoundly influenced the drainage evolution in the Yellow River headwater area. The shrinkage of the Yellow River headwater is mainly driven by the northeastward expansion of the Tibetan Plateau in the Late Cenozoic. Meanwhile, the Yellow River headwater area has become increasingly flattening, which creates conditions for sedimentation and periodic disintegration and re-integration events driven by cyclical climate changes (e.g., glacial cycles).
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来源期刊
CiteScore
5.90
自引率
10.00%
发文量
398
审稿时长
3.8 months
期刊介绍: Palaeogeography, Palaeoclimatology, Palaeoecology is an international medium for the publication of high quality and multidisciplinary, original studies and comprehensive reviews in the field of palaeo-environmental geology. The journal aims at bringing together data with global implications from research in the many different disciplines involved in palaeo-environmental investigations. By cutting across the boundaries of established sciences, it provides an interdisciplinary forum where issues of general interest can be discussed.
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