Sentinel-2卫星显示的青藏高原内陆河的水量和宽度特征

IF 6.3 1区 地球科学 Q1 ENGINEERING, CIVIL
Fanxuan Zeng , Kai Liu , Yongquan Zhao , Pengju Xu , Xinyuan Deng , Tan Chen , Chunqiao Song
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引用次数: 0

摘要

青藏高原内陆区是受气候变化影响的热点地区,但河流水文特征及其发展的驱动因素尚不清楚。为了解决这一问题,我们提出了一个遥感框架来揭示跨时空尺度的河流水域范围和宽度。利用2019年至2021年解冻期间观测到的所有Sentinel-2 MSI图像,生成了一个多时相水频层。分别描述了最大淹没状态(10%水频)、中位淹没状态(50%水频)和瞬时淹没状态(干湿过渡季节单日观测)3种状态。水频图与全球地表水数据集进行了比较,河流宽度估计值与现场测量结果进行了验证。结果表明,导出数据与参考数据具有较高的一致性。河道宽度具有较强的评价指标,R2为0.83,均方根误差为15.26 m,平均绝对误差为12.71 m,平均绝对百分比误差为17.32%。在最大淹没时,内源性TP河流(最大。宽度比;流域全长20686.67公里,面积1514.92平方公里,平均宽度87.53米,最大宽度3763.82米,流域密度为0.02公里/平方公里。在中间(瞬时)状态下,河流总面积、河段长度和平均宽度分别占最大状态的34.27%(48.26%)、60.16%(79.49%)和32.29%(41.51%)。这些内河TP河流的发育受构造地貌和冰川分布的显著影响,而气候条件主要决定了流域密度,并随干旱程度的增加呈现非线性趋势。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Characteristics of the water extent and width of endorheic Tibetan Plateau rivers revealed by Sentinel-2
The endorheic Tibetan Plateau (TP) is a hotspot affected by climate change, yet the hydrological characteristics of rivers and the factors driving their development have not been clearly elucidated. To address this, we proposed a remote sensing framework to reveal river water extent and width across multiple spatial and temporal scales. A multi-temporal water frequency layer was generated using all Sentinel-2 MSI images observed in unfreezing periods between 2019 and 2021. Three river water inundation states, including the maximum state (10 % water frequency), the median state (50 % water frequency), and the instantaneous state (single-date observation in the wet-to-dry-transition season), were described separately. Water frequency maps were compared with global surface water datasets, and river width estimates were validated against field measurements. The results showed high consistency between the derived data and the reference dataset. The river width showed strong evaluation metrics, with a R2 of 0.83, a root mean square error of 15.26 m, a mean absolute error of 12.71 m, and a mean absolute percentage error of 17.32 %. At maximum inundation, endorheic TP rivers (max. width > 10 m) spanned 20,686.67 km, covering 1,514.92 km2, with an average width of 87.53 m and a maximum of 3,763.82 m, yielding a drainage density of 0.02 km/km2. In the median (instantaneous) states, the total river area, reach length, and average width accounted for 34.27 % (48.26 %), 60.16 % (79.49 %), and 32.29 % (41.51 %) of the maximum state. The development of these endorheic TP rivers was significantly influenced by tectonic landforms and glacier distribution, while climate conditions primarily shaped drainage density, showing a nonlinear trend with increasing aridity.
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来源期刊
Journal of Hydrology
Journal of Hydrology 地学-地球科学综合
CiteScore
11.00
自引率
12.50%
发文量
1309
审稿时长
7.5 months
期刊介绍: The Journal of Hydrology publishes original research papers and comprehensive reviews in all the subfields of the hydrological sciences including water based management and policy issues that impact on economics and society. These comprise, but are not limited to the physical, chemical, biogeochemical, stochastic and systems aspects of surface and groundwater hydrology, hydrometeorology and hydrogeology. Relevant topics incorporating the insights and methodologies of disciplines such as climatology, water resource systems, hydraulics, agrohydrology, geomorphology, soil science, instrumentation and remote sensing, civil and environmental engineering are included. Social science perspectives on hydrological problems such as resource and ecological economics, environmental sociology, psychology and behavioural science, management and policy analysis are also invited. Multi-and interdisciplinary analyses of hydrological problems are within scope. The science published in the Journal of Hydrology is relevant to catchment scales rather than exclusively to a local scale or site.
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