Hydrological ecosystem changes and impacts after the Zonag Lake outburst in Hoh Xil of Tibetan Plateau

IF 1.7 Q3 GEOSCIENCES, MULTIDISCIPLINARY

Journal of Asian Earth Sciences: X Pub Date : 2021-12-01 DOI:10.1016/j.jaesx.2021.100064

Yanpei Chen , Shanlong Lu , Jinfeng Zhou , Muhammad Hasan Ali Baig , Fu Chen , Hailong Tang , Yongfei Zhang , Xiaohong Yang , Liqiang Ge

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Abstract

After the iconic outburst of Zonag Lake in Hoh Xil of Tibetan Plateau (TP) in 2011, the causes of the collapse and its impact on the volume of water contained by the downstream lakes have highly been concerned, but the overall changes of the hydrological ecosystem and its impacts on the basin are yet not clear. This paper analyzes the hydrological system (lake area and hydrological connection) and ecosystem (sandstorm activity and vegetation growth status) changes and their impacts on the regional ecological environment after the outburst event, based on remotely sensed images from 2000 to 2020, meteorological observations, and field surveys. The results show that the outburst of Zonag Lake has not only changed the regional hydrology and ecosystem pattern but also caused a trend of degradation in the ecological environment of Zonag Lake Basin. Some lambing areas and active areas of Tibetan antelope in the area are being buried and eroded by the sandstorm. The downstream Yanhu Lake has risen to the highest level and overflowed through the emergency diversion engineering. These impacts are continuously threatening the health of the ecological environment of the world natural heritage site in Hoh Xil, the safety of Qinghai-Tibet highway, Qinghai-Tibet railway, and other engineering facilities, as well as the stability of fluvial geomorphology in the northern most sources of Yangtze River.

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青藏高原可可西里宗格湖溃决后水文生态系统变化及其影响

2011年青藏高原可可西里Zonag湖标志性爆发后，崩塌的原因及其对下游湖泊水量的影响一直备受关注，但水文生态系统的整体变化及其对流域的影响尚不清楚。基于2000年至2020年的遥感图像、气象观测和实地调查，分析了突发事件后水文系统（湖区和水文连接）和生态系统（沙尘暴活动和植被生长状况）的变化及其对区域生态环境的影响。结果表明，Zonag湖的爆发不仅改变了区域水文和生态系统格局，而且造成了Zonag湖盆地生态环境的恶化趋势。该地区的一些产羔区和藏羚羊活动区正在被沙尘暴掩埋和侵蚀。下游堰湖已升至最高水位，并通过应急导流工程溢流。这些影响正在持续威胁可可西里世界自然遗产地生态环境的健康，青藏公路、青藏铁路等工程设施的安全，以及长江最北端源头河流地貌的稳定。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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