Morphodynamic processes in a large gravel-bed braided channel in response to runoff change: a case study in the Source Region of Yangtze River

Lu, Haiyang; Li, Zhiwei; Hu, Xuyue; Chen, Bang; You, Yuqi

doi:10.1007/s12517-022-09641-y

Cited by 10 publications

(14 citation statements)

References 43 publications

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“…The average elevation of the basin is over 4600 m. The Tuotuo River Basin is the primary source of the Yangtze River, with the watershed as the western boundary. The south and southeast are bounded by connecting lines of peaks, such as Geladandong, Suojayidoga, Zhabao Shainabao, and Zharigen, and the north is adjacent to the Chumar River basin [ 9 , 10 ]. The geomorphic types of the Tuotuo River Basin are complex, and glacier, permafrost, flowing water, eolian, lake, and swamp geomorphologies are among the main geomorphic types [ 47 ].…”

Section: Study Area and Datasetsmentioning

confidence: 99%

“…From 1961 to 2018, the annual average temperature and precipitation showed an increasing trend, increasing at a rate of 0.37 °C/10a and 9.86 mm/10a, respectively [ 47 ]. Influenced by climate, hydrology, stratum, structure, and permafrost, the occurrence of groundwater and its dynamic distribution characteristics over the study area are spatially heterogeneous [ 9 ]. Permafrost plays a critical control role among the influencing factors [ 9 ].…”

Section: Study Area and Datasetsmentioning

confidence: 99%

“…Influenced by climate, hydrology, stratum, structure, and permafrost, the occurrence of groundwater and its dynamic distribution characteristics over the study area are spatially heterogeneous [ 9 ]. Permafrost plays a critical control role among the influencing factors [ 9 ]. The Tuotuo River Basin belongs to an alpine climate, and the permafrost throughout the basin has a depth ranging from 1~3 m. The thickness varies seasonally, and the general annual thawing period is approximately 150 days [ 49 ].…”

Section: Study Area and Datasetsmentioning

confidence: 99%

“…The Tuotuo River is the source of the Yangtze River, starting from the Jianggudiru Glacier in the south and ending at the foot of Nangi Balong Hill in the east to meet the Dang Qu [ 9 , 10 ]. Permafrost and seasonally frozen ground are distributed in the Tuotuo River Basin.…”

Section: Introductionmentioning

confidence: 99%

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Evaluating Permafrost Degradation in the Tuotuo River Basin by MT-InSAR and LSTM Methods

Ping

Liu

Zhang

et al. 2023

Sensors

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Permafrost degradation can significantly affect vegetation, infrastructure, and sustainable development on the Qinghai-Tibet Plateau (QTP). The permafrost on the QTP faces a risk of widespread degradation due to climate change and ecosystem disturbances; thus, monitoring its changes is critical. In this study, we conducted a permafrost surface deformation prediction over the Tuotuo River tributary watershed in the southwestern part of the QTP using the Long Short-Term Memory model (LSTM). The LSTM model was applied to the deformation information derived from a time series of Multi-Temporal Interferometry Synthetic Aperture Radar (MT-InSAR). First, we designed a quadtree segmentation-based Small BAseline Subset (SBAS) to monitor the seasonal permafrost deformation from March 2017 to April 2022. Then, the types of frozen soil were classified using the spatio-temporal deformation information and the temperature at the top of the permafrost. Finally, the time-series deformation trends of different types of permafrost were predicted using the LSTM model. The results showed that the deformation rates in the Tuotuo River Basin ranged between −80 to 60 mm/yr. Permafrost, seasonally frozen ground, and potentially degraded permafrost covered 7572.23, 900.87, and 921.70 km2, respectively. The LSTM model achieved high precision for frozen soil deformation prediction at the point scale, with a root mean square error of 4.457 mm and mean absolute error of 3.421 mm. The results demonstrated that deformation monitoring and prediction using MT-InSAR technology integrated with the LSTM model can be used to accurately identify types of permafrost over a large region and quantitatively evaluate its degradation trends.

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Section: Study Area and Datasetsmentioning

confidence: 99%

Section: Study Area and Datasetsmentioning

confidence: 99%

Section: Study Area and Datasetsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Evaluating Permafrost Degradation in the Tuotuo River Basin by MT-InSAR and LSTM Methods

Ping

Liu

Zhang

et al. 2023

Sensors

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“…As the highest dynamic and unpredictable river pattern, braided river is a complex system of shallow multi-threaded channel which separated by irregular sandbars. Morphodynamic processes of braided river are intensified during flood period (Lu et al, 2022;Shampa and Ali, 2019). Moreover, owing to the intensive erosion and deposition of multi-threaded channel, riverbed configuration is rapidly adjusted (Li et al, 2020d;Lu et al, 2022;Shampa and Ali, 2019).…”

Section: Introductionmentioning

confidence: 99%

Channel morphological activation of large braided rivers in response to climate-driven water and sediment flux change in the Qinghai-Tibet Plateau

Li,

He,

Zhou

2023

Preprint

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With the rising air temperature and precipitation, water and sediment flux in the Source Region of the Yangtze River have increased significantly since 2000. Nonetheless, the response of braided river morphology to climate-driven water and sediment flux change is still unknown. Water bodies of nine large braided rivers from 1990 to 2020 were extracted based on Google Earth Engine platform, and impacts of climate change on activation indices of braided river morphology were quantified. The main results are presented that a new method of braided water body extraction by combining Lowpath algorithm and Local Otsu algorithm is firstly proposed, which reduces 59% of the root mean squared error of braiding intensity in comparison with the Global Otsu method. The braiding intensity has a parabolic variation trend with the water area ratio, and the average sandbar area ratio has a negative power law trend with the water area ratio. Intra-annual channel migration intensity has an obvious temporal scale effect, which increases rapidly when the time span is less than 5 years. The warming and wetting trend led to vegetation cover increasing significantly. With the increase of runoff, water area of each braided reach has increased in both flood and non-flood season. Intra-annual channel migration intensity shows three different trends of increasing, weakening, and unchanged over time. The response of migration intensity to climate warming can be classified into three patterns in the SRYR as follows: sediment increase constrained pattern, sediment increase dominated pattern, and runoff increase dominated pattern.

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Age and environmental conditions for the formation of the Pannonian mega-yardang system

Trájer

2024

Int J Earth Sci (Geol Rundsch)

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The Pannonian mega-yardang system is the northernmost mega-yardang field in Europe, exerting a profound influence on the relief and surface hydrographic structure of Western Hungary. Despite its significance, the precise timing and climatic conditions under which this mega-yardang system formed remain elusive. The geological setting was studied, the former humidity and biome patterns were modelled, the climatically analogous regions of the past climates of the region were identified, and the Köppen Aridity Indices of the region were compared to the aridity values of other yardang fields from five continents in the last 3.3 mys. The geological structure of the yardangs suggests an origin post-dating the Tortonian period but preceding the mid-Pleistocene era. In the Zanclean and in the warmer periods of the Piacenzian, the studied region had humid subtropical climatic conditions that were not suitable for the formation of large-scale aeolian landforms. Similarly, in the Quaternary period, the climate varied between boreal and humid continental, which was not conducive to the formation of mega-yardang fields. Cold semi-arid climatic conditions only existed in the mid-Pliocene cold period and perhaps at the transition of the Pliocene to the Pleistocene. This paleoclimatic hypothesis is in accordance with the Pliocene fossil record of the region, which contains the remains of such arid habitat-dwelling fauna elements as camelids and struthionids. The comparison of the development of Köppen Aridity Indices among yardangs in other territories also suggests that the Pannonian mega-yardang system may have formed around the transition of the Neogene to the Quaternary epochs. Graphical abstract

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Morphodynamic processes in a large gravel-bed braided channel in response to runoff change: a case study in the Source Region of Yangtze River

Cited by 10 publications

References 43 publications

Evaluating Permafrost Degradation in the Tuotuo River Basin by MT-InSAR and LSTM Methods

Evaluating Permafrost Degradation in the Tuotuo River Basin by MT-InSAR and LSTM Methods

Channel morphological activation of large braided rivers in response to climate-driven water and sediment flux change in the Qinghai-Tibet Plateau

Age and environmental conditions for the formation of the Pannonian mega-yardang system

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