Exploring the geomorphological processes of Qinghai Lake and surrounding lakes in the northeastern Tibetan Plateau, using Multitemporal Landsat Imagery (1973-2015)
Exploring the geomorphological processes of Qinghai Lake and surrounding lakes in the northeastern Tibetan Plateau, using Multitemporal Landsat Imagery (1973-2015)
复制标题
利用多时相陆地卫星影像探索青藏高原东北部青海湖及周边湖泊的地貌过程（1973-2015）
DOI：
10.1016/j.gloplacha.2017.03.009
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发表时间：
2017-05-01
影响因子：
3.9
通讯作者：
Li, Xiao-Dong
中科院分区：
文献类型：
--
作者：
Cui, Bu-Li;Xiao, Bei;Li, Xiao-Dong
研究湖泊的海岸线和形态变化及其影响因素，有助于了解湖泊的地貌和水文演变。在此基础上，分析了该地区的地貌过程，以及面积和海岸线变化的原因。结果表明：湖泊总面积的变化分为3个阶段：稳定减少阶段（1973-1988）、波动减少阶段（1988-2005）和快速增加阶段（2005-2015）。青海湖和尕海面积的变化趋势与总湖面积的变化趋势相似。洱海面积在1973 - 2004年呈波动趋势，2004 - 2015年呈上升趋势。2003年，海盐湾与青海湖分离，2006年再次与青海湖连通。除洱海和沙岛湖外，各湖泊面积变化与青海湖水位变化呈显著正相关，河口面积变化与湖泊水位变化呈显著负相关，表明湖泊水位越高，陆地被淹没越多。沙岛地区湖泊的演化过程受风沙和湖泊水量平衡的影响，降水量相对较少，蒸发量较大。洱海还受到稻塘河径流的影响。除布哈河外，入湖河流的输沙量相对较小，对入海口的影响较小。湖波流从西海岸向东海岸输送的风沙将形成水下屏障，沙岛地区陆地面积缓慢增加，沙岛地区海岸线向湖泊延伸。因此，未来青海湖从西到东的直径会变短，而从南到北的直径会变长。(C) 2017 Elsevier B.V.版权所有
Studies of lake's coastline and shape changes and the influencing factors will contribute to knowledge about the geomorphological and hydrological evolutions of those lakes. This study extracted coastlines of Qinghai Lake and surrounding lakes in the northeastern Tibetan Plateau from multitemporal remote sensing data from 1973 to 2015. The geomorphological processes and the reasons for area and coastline variations were then analyzed. The results showed that: the changes of the total lake area were divided into three stages: the stable decrease stage (1973-1988), the fluctuant decrease stage (1988-2005), and the rapidly increase stage (2005-2015). The changes of Qinghai Lake area and Gahai Lake area showed a similar trend as the total lake area. The Erhai Lake area fluctuated from 1973 to 2004 and then increased from 2004 to 2015. Haiyanwan Lake was isolated from Qinghai Lake in 2003 and was linked into Qinghai Lake in 2006, again. The lakes area variations, excluding Erhai Lake and Shadao Lake, were positively correlated with the variation of the Qinghai Lake level, and estuary area variations were significantly negatively correlated to the lake level, indicating that the higher lake level led to more land being submerged. The evolutionary processes of lakes in the Shadao Region were influenced by aeolian sand and lake water balance experiencing relatively low precipitation and strong evaporation. Erhai Lake was also influenced by river runoff from Daotang River. Sediment loads from rivers flowing into Qinghai Lake, except for Buha River, were relative low and only slightly influenced the estuary. Aeolian sand transported by the lake waves and currents from west coast to east coast will form subaqueous barriers, the Shadao Region land area will increase slowly, and the coastline of the Shadao Region will extend towards the lake. Therefore, the diameter of Qinghai Lake from the west to east coast will become shorter, while the diameter from the south to north coast will become longer in future. (C) 2017 Elsevier B.V. All rights reserved.