Journal of Geophysical Research: Earth Surface最新文献

Automated Mapping of Braided Palaeochannels From Optical Images With Deep Learning Methods

IF 3.5 2区地球科学

Journal of Geophysical Research: Earth Surface Pub Date : 2025-02-20 DOI: 10.1029/2024JF008051

F. Vanzani, P. Carbonneau, A. Fontana

{"title":"Automated Mapping of Braided Palaeochannels From Optical Images With Deep Learning Methods","authors":"F. Vanzani, P. Carbonneau, A. Fontana","doi":"10.1029/2024JF008051","DOIUrl":"https://doi.org/10.1029/2024JF008051","url":null,"abstract":"The increasing availability of remotely sensed data has provided an enormous quantity of information for studying the geomorphology of exposed surfaces of alluvial plains. In many cases, the key for reconstructing their formation lies in the recognition of optical traces related to abandoned palaeochannels and their morphometric characteristics. Abundant braided palaeohydrographic traces are documented in alluvial plains of northern Italy, where large sectors of the present surface correspond to landforms related to fluvioglacial systems supplied by Alpine glaciers during the Last Glacial Maximum (LGM). Nevertheless, the complexity of multichannel patterns, the overlapping field division systems and urbanization, hinder the efforts to manually map these traces. In this work, we used high-resolution aerial photos of the proximal sector of the Friulian Plain (NE Italy) to train an Attention-UNet deep learning algorithm to segment palaeohydrographic traces. The trained model was used to automatically recognize braided palaeochannels over 232 km2. The resulting map represents a significant step for investigating the long-term alluvial dynamics. Moreover, we assessed the robustness of our method by deploying the model in three other areas in northern Italy with comparable characteristics, as well as in Montenegro, near Podgorica. In each case, the braided pattern was successfully mapped by the algorithm. This work highlights the breakthrough potential of deep learning methods to rapidly detect complex geomorphological traces in cultivated plains, taking into consideration advantages, challenges and limitations.","PeriodicalId":15887,"journal":{"name":"Journal of Geophysical Research: Earth Surface","volume":"130 2","pages":""},"PeriodicalIF":3.5,"publicationDate":"2025-02-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1029/2024JF008051","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143446662","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Knickpoint Dynamics During the Outward Growth of the Northeastern Tibetan Plateau

IF 3.5 2区地球科学

Journal of Geophysical Research: Earth Surface Pub Date : 2025-02-19 DOI: 10.1029/2024JF007820

Zhengchen Li, Xianyan Wang, Xiaoping Yuan, Chuanqi He, Qi Su, Huayu Lu

{"title":"Knickpoint Dynamics During the Outward Growth of the Northeastern Tibetan Plateau","authors":"Zhengchen Li, Xianyan Wang, Xiaoping Yuan, Chuanqi He, Qi Su, Huayu Lu","doi":"10.1029/2024JF007820","DOIUrl":"https://doi.org/10.1029/2024JF007820","url":null,"abstract":"Mountain-building events often initiate fluvial erosion waves that usually propagate upstream. Previous studies have delved into the erosion wave, manifested as knickpoint migration, presuming a spatially consistent uplift of plateaus. However, the expansion of plateaus can spatially result in spatially variable rock uplift rates across different regions, complicating our understanding of knickpoint dynamics. In this study, conducted at the edge of the northeastern Tibetan Plateau, we investigated the impact of plateau expansion on erosion wave processes within the upper Yellow River basin. Through river profile analyses and landscape evolution simulations, we reveal that the continuous outward expansion of the northeastern Tibetan Plateau into its periphery has induced localized uplift followed by erosion. Subsequently, an erosion wave migrated headward along the Yellow River during the Pleistocene. Observations from the Digital Elevation Model and modeling results show that this erosion wave spread within the tectonically active sub-block at the margin of the plateau, but did not continue further upstream. In contrast, modeling results suggest that erosion waves would consistently migrate upstream under conditions of spatially uniform rock uplift. Our findings highlight that spatially variable rock uplift rates, driven by the expansion of the plateau, are crucial in determining whether fluvial erosion waves migrate or remain stationary. This refined understanding of knickpoint dynamics during plateau development offers insights into the persistence of relict high-elevation and low-relief landscapes.","PeriodicalId":15887,"journal":{"name":"Journal of Geophysical Research: Earth Surface","volume":"130 2","pages":""},"PeriodicalIF":3.5,"publicationDate":"2025-02-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143439154","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Two Decades of Dust Radiative Forcing on Snow Cover Across the Great Salt Lake Basin

IF 3.5 2区地球科学

Journal of Geophysical Research: Earth Surface Pub Date : 2025-02-18 DOI: 10.1029/2024JF007957

Otto I. Lang, Patrick Naple, Derek Mallia, Ty Hosler, Bradley Adams, S. McKenzie Skiles

{"title":"Two Decades of Dust Radiative Forcing on Snow Cover Across the Great Salt Lake Basin","authors":"Otto I. Lang, Patrick Naple, Derek Mallia, Ty Hosler, Bradley Adams, S. McKenzie Skiles","doi":"10.1029/2024JF007957","DOIUrl":"https://doi.org/10.1029/2024JF007957","url":null,"abstract":"Seasonal snowpacks in mountain drainages of the Great Salt Lake Basin (GSLB), western United States, are the primary surface water supply to regional agriculture, the metropolitan Wasatch Front, and the terminal Great Salt Lake. Spring dust emissions from the eastern Great Basin result in a dust-darkened GSLB snowpack, locally accelerating snowmelt relative to dust-free conditions. Such acceleration has been linked to streamflow forecasting errors in the adjacent Colorado River Basin, but snow darkening impacts within the GSLB are largely uninvestigated. To quantify the dust impact, we analyzed patterns in dust radiative forcing (RFdust) over the MODIS record (2001–2023) using spatially and temporally complete RFdust and fractional snow-covered area products. For validation, retrievals were cross-referenced with in situ RFdust observations. Results showed that RFdust was present every year and had no significant trend over the record. Spatially, RFdust was similar across all three subbasins. Temporally, RFdust exhibited high interannual variability (−30 to +40 Wm−2 from record means) and has declined slightly in regions of the eastern GSLB. Controls of RFdust may be linked to seasonal meteorology and drought conditions, but drivers remain uncertain. Further understanding of the distribution and controls of RFdust in the GSLB during changing climate and weather patterns may allow us to predict snowmelt more accurately.","PeriodicalId":15887,"journal":{"name":"Journal of Geophysical Research: Earth Surface","volume":"130 2","pages":""},"PeriodicalIF":3.5,"publicationDate":"2025-02-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1029/2024JF007957","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143431785","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Future Trajectories of Peatland Permafrost Under Climate and Ecosystem Change in Northeastern Canada

IF 3.5 2区地球科学

Journal of Geophysical Research: Earth Surface Pub Date : 2025-02-16 DOI: 10.1029/2024JF007930

Yifeng Wang, Robert G. Way

{"title":"Future Trajectories of Peatland Permafrost Under Climate and Ecosystem Change in Northeastern Canada","authors":"Yifeng Wang, Robert G. Way","doi":"10.1029/2024JF007930","DOIUrl":"https://doi.org/10.1029/2024JF007930","url":null,"abstract":"Peatland permafrost ecosystems include culturally and ecologically important habitats for plants and wildlife. Widespread degradation of palsas and peat plateaus suggests vulnerability of these landforms to climate warming, but ecosystem changes, including landscape greening due to shrub expansion and related changes in snow distribution, are also expected to impact permafrost persistence. In this study, a process-based one-dimensional transient model is used to simulate an ensemble of future ground temperature trajectories for seven palsa and two peat plateau study sites along the Labrador Sea coastline. Ground temperatures are modeled from 2024 to 2100 under nine scenarios, which account for differences in future land cover, snow, and climate warming (RCP4.5 and RCP8.5). All scenarios incorporating a change in ecosystem characteristics and/or climate result in loss of permafrost at all sites by 2100, with some sites experiencing loss of permafrost by 2036. Although permafrost thaw occurs at all sites under most scenarios, the sites exhibit wide variations in thaw rates due to differences in latitude, geomorphological characteristics, and initial permafrost thicknesses. Most sites experience active layer thickening, but four of the nine sites also see the development of supra-permafrost taliks, though this occurs almost exclusively in the scenarios that incorporate ecosystem change. The development of taliks under these scenarios and the earlier loss of permafrost suggest that peatland permafrost in coastal Labrador may be more sensitive to ecosystem change than climate warming alone. These results provide important insights into the future evolution and climate sensitivity of permafrost peatlands in the discontinuous permafrost zone.","PeriodicalId":15887,"journal":{"name":"Journal of Geophysical Research: Earth Surface","volume":"130 2","pages":""},"PeriodicalIF":3.5,"publicationDate":"2025-02-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1029/2024JF007930","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143423892","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Deciphering Landslide Precursors From Spatiotemporal Ground Motion Using Persistent Homology

IF 3.5 2区地球科学

Journal of Geophysical Research: Earth Surface Pub Date : 2025-02-13 DOI: 10.1029/2024JF007949

Jiangzhou Mei, Gang Ma, Chengqian Guo, Ting Wu, Jidong Zhao, Wei Zhou

{"title":"Deciphering Landslide Precursors From Spatiotemporal Ground Motion Using Persistent Homology","authors":"Jiangzhou Mei, Gang Ma, Chengqian Guo, Ting Wu, Jidong Zhao, Wei Zhou","doi":"10.1029/2024JF007949","DOIUrl":"https://doi.org/10.1029/2024JF007949","url":null,"abstract":"Landslides are major natural disasters that pose significant challenges for prediction. Recent advances in monitoring tools have led to the accumulation of monitoring data with high spatiotemporal resolution, calling for new and robust methodologies to efficiently analyze these complex big data and accurately predict landslides. Here, we present a persistent homology-based method that integrates the slope-scale monitoring data from interferometric synthetic aperture radar with novel measures of spatiotemporal evolution of slope deformation to identify early warning precursors for impending landslides. Our proposed method can capture critical patterns of accelerated deformation evolution and generate warning signals long before the landslide occurrence. Six case studies confirm the effectiveness and accuracy of the proposed method in landslide prediction, with a leading time exceeding 100 days for the Xinmo and Mud Creek landslides. Strong spatiotemporal correlations of slope deformation underscore long-range effective predictions. Our method offers a new, robust alternative to the conventional threshold-based approach for understanding and predicting landslides in natural slopes.","PeriodicalId":15887,"journal":{"name":"Journal of Geophysical Research: Earth Surface","volume":"130 2","pages":""},"PeriodicalIF":3.5,"publicationDate":"2025-02-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143404466","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Shoreline Seasonality of California's Beaches

IF 3.5 2区地球科学

Journal of Geophysical Research: Earth Surface Pub Date : 2025-01-30 DOI: 10.1029/2024JF007836

Jonathan A. Warrick, Daniel Buscombe, Kilian Vos, Hannah Kenyon, Andy C. Ritchie, Mitchell D. Harley, Catherine Janda, Jess L’Heureux, Sean Vitousek

{"title":"Shoreline Seasonality of California's Beaches","authors":"Jonathan A. Warrick, Daniel Buscombe, Kilian Vos, Hannah Kenyon, Andy C. Ritchie, Mitchell D. Harley, Catherine Janda, Jess L’Heureux, Sean Vitousek","doi":"10.1029/2024JF007836","DOIUrl":"https://doi.org/10.1029/2024JF007836","url":null,"abstract":"We report on remote sensing techniques developed to characterize seasonal shoreline cycles from satellite-derived shoreline measurements. These techniques are applied to 22-yr of shoreline measurements for over 777 km of beach along California's 1,700-km coast, for which the general understanding is that shorelines exhibit winter-narrow and summer-recovery seasonality. We find that approximately 90% of beach transects exhibit significant and recurring seasonal cycles in the shoreline position. Seasonal shoreline excursions are twice as large in northern and central California (17.5–32.2 m) than southern California (7.3–15.9 m; interquartile ranges). Clustering analyses were effective at characterizing the temporal patterns of the seasonality, revealing that ∼459 km of beach (59%) exhibit winter-narrow conditions, whereas ∼189 km (24%) and ∼50 km (6.4%) exhibit spring-narrow and summer-narrow conditions, respectively. These spring- and summer-narrow conditions are most common in southern California, where they represent over half of the total length of beach shoreline. Multivariate analyses reveal that wave climate and geomorphic setting are significantly related to the magnitude and timing of shoreline seasonal cycles. Combinations of these variables explain 44% of the seasonality variance of the complete data set and 85% of the variance for a subset of 93 long (>1 km) continuous beaches. We conclude that diversity in waves and geomorphic setting along California cause a broad range of seasonal patterns in the shoreline. Combined, this indicates that the overly generalized “winter-narrow/summer-recovery” conventions for California beaches are not expressed universally and that shoreline seasonality is far more diverse than these simple canonical rules.","PeriodicalId":15887,"journal":{"name":"Journal of Geophysical Research: Earth Surface","volume":"130 2","pages":""},"PeriodicalIF":3.5,"publicationDate":"2025-01-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1029/2024JF007836","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143120984","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Exploring Controls on Post-Orogenic Topographic Stasis of the Pyrenees Mountains With Inverse Landscape Evolution Modeling

IF 3.5 2区地球科学

Journal of Geophysical Research: Earth Surface Pub Date : 2025-01-29 DOI: 10.1029/2024JF007759

Magdalena Ellis Curry, Peter van der Beek

{"title":"Exploring Controls on Post-Orogenic Topographic Stasis of the Pyrenees Mountains With Inverse Landscape Evolution Modeling","authors":"Magdalena Ellis Curry, Peter van der Beek","doi":"10.1029/2024JF007759","DOIUrl":"https://doi.org/10.1029/2024JF007759","url":null,"abstract":"How high topography can be sustained over long timescales in post-orogenic mountain belts is a longstanding research question in tectonic geomorphology and geodynamics. Here we utilize the well-documented orogenic paleo-topography and spatial-temporal exhumation patterns of the Pyrenee Mountains in a numerical modeling study investigating controls on post-orogenic topographic stasis. Orogenic activity in the Pyrenees Mountains ceased at ca. 25-20 Ma, but topographic decay has only been on the scale of hundreds of meters since that time. We use the landscape-evolution model FastScape coupled with the neighborhood-algorithm inversion method to explore the influence of precipitation, lithology, and stream power parameters on post-orogenic topographic stability. The inversions are constrained using topography (elevation, slope) and low-temperature thermochronology data. We find that incorporation of an erodibility threshold is required for moderating post-orogenic topographic decay, without which post-orogenic topography declines significantly on Myr timescales. While other evaluated parameters such as lithology and precipitation also contribute to topographic stability, they are secondary to the erodibility threshold in maintaining long-term post-orogenic topography. Our results provide valuable insights into the mechanisms governing post-orogenic landscape evolution and emphasize the importance of thresholds in landscape evolution modeling of mountain belts.","PeriodicalId":15887,"journal":{"name":"Journal of Geophysical Research: Earth Surface","volume":"130 2","pages":""},"PeriodicalIF":3.5,"publicationDate":"2025-01-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1029/2024JF007759","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143120649","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Evolving Dunes Under Flow Reversals: From an Initial Heap Toward an Inverted Dune

IF 3.5 2区地球科学

Journal of Geophysical Research: Earth Surface Pub Date : 2025-01-28 DOI: 10.1029/2024JF007779

W. R. Assis, E. M. Franklin, N. M. Vriend

{"title":"Evolving Dunes Under Flow Reversals: From an Initial Heap Toward an Inverted Dune","authors":"W. R. Assis, E. M. Franklin, N. M. Vriend","doi":"10.1029/2024JF007779","DOIUrl":"https://doi.org/10.1029/2024JF007779","url":null,"abstract":"Sand dunes are ubiquitous in nature, and are found in abundance on Earth and other planetary environments. One of the most common types are crescent-shaped dunes known as barchans, whose mid-line could be assumed to behave as 2D dunes. In this work, we (a) compare the morphology of the mid-line of 3D barchans with 2D dunes; and (b) track the evolution of 3D barchans and 2D dunes while reversing flow conditions. We performed experiments on 2D dunes in a 2D flume and Euler-Lagrange simulations of 3D bedforms. In all reversal experiments and simulations, the initial condition starts with a conical heap being deformed into a steady-state dune, which is then perturbed by reversing the flow, resulting in an inverted dune. We show that during the reversal the grains on the lee side immediately climb back onto the dune while its internal part and toe remain static, forming a new lee face of varying angle on the previous stoss slope. We show that (a) the characteristic time for the development of 2D dunes scales with that for 3D barchans, (b) that the time for dune reversal is twice the time necessary to develop an initial triangular or conical heap to steady-state, and (c) that a considerable part of grains remain static during the entire process. Our findings reveal the dynamics for dune reversal, and highlight that numerical computations of barchans based on 2D slices, which are more feasible in geophysical scales, predict realistic outcomes for the relevant time-scales.","PeriodicalId":15887,"journal":{"name":"Journal of Geophysical Research: Earth Surface","volume":"130 2","pages":""},"PeriodicalIF":3.5,"publicationDate":"2025-01-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1029/2024JF007779","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143120298","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

On the Role of Ripple Secondary Crest on Nearbed Hydrodynamics

IF 3.5 2区地球科学

Journal of Geophysical Research: Earth Surface Pub Date : 2025-01-25 DOI: 10.1029/2024JF007860

C. Jin, Z. Gong, J. E. San Juan, R. O. Tinoco, G. Coco

{"title":"On the Role of Ripple Secondary Crest on Nearbed Hydrodynamics","authors":"C. Jin, Z. Gong, J. E. San Juan, R. O. Tinoco, G. Coco","doi":"10.1029/2024JF007860","DOIUrl":"https://doi.org/10.1029/2024JF007860","url":null,"abstract":"Ripples are ubiquitous in sandy beds and their geometry plays an important role in determining seabed roughness and intensifying near-bed turbulence. Ripple geometry in natural settings often deviates from equilibrium configurations. To understand how such nonequilibrium geometry and structures impact near-bottom hydrodynamics and hydraulic roughness, we performed laboratory experiments examining the effect of two different types of ripple configurations. We employed two distinct fixed 3D-printed ripple morphologies, uniform ripples and ripples with superimposed secondary crests, and replicated natural conditions by adhering sand grains, matching in size to the ripple scale, onto their surfaces. Our results show that the introduction of secondary crest disrupts the flow over not only the modified ripple but also over its neighbors. Secondary crests induce a thicker boundary layer than regular ripples. Velocities over the upstream side of secondary crest show substantial deviation from the regular ripple baseline case, while the downstream side experiences a lower effect. The shear velocity at the crest of ripples with a secondary feature is significantly higher, indicating an increased capacity for sediment transport and bedform evolution. The turbulent kinetic energy over ripples with secondary crests is twice as high as that over regular ripples. Our results further affirm that the hydraulic roughness is a function of not only the height and wavelength of the ripples, but also of specific structures and ripple geometry.","PeriodicalId":15887,"journal":{"name":"Journal of Geophysical Research: Earth Surface","volume":"130 1","pages":""},"PeriodicalIF":3.5,"publicationDate":"2025-01-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143119032","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Consecutive Glacier Sub-Surge Events Within Five Years Were Identified in an Unexplored Glacier of the Karakoram

IF 3.5 2区地球科学

Journal of Geophysical Research: Earth Surface Pub Date : 2025-01-24 DOI: 10.1029/2024JF007974

Q. H. Zhu, H. L. Li, C. Q. Ke

{"title":"Consecutive Glacier Sub-Surge Events Within Five Years Were Identified in an Unexplored Glacier of the Karakoram","authors":"Q. H. Zhu, H. L. Li, C. Q. Ke","doi":"10.1029/2024JF007974","DOIUrl":"https://doi.org/10.1029/2024JF007974","url":null,"abstract":"In order to monitor the dynamic changes of an unnamed glacier (called G1 Glacier) located in the Karakoram in detail, glacier surface velocities were extracted from 165 Sentinel-1 SAR images with 12-day and 24-day time intervals from 2014 to 2020, glacier elevation changes were obtained from four ASTER stereo images, and glacier terminus evolutions were derived from four Landsat 8 images. Based on the high-density glacier surface velocity results, four consecutive glacier sub-surge events of the G1 Glacier ranging from 6 months to 1 yr between 2015 and 2019 were confirmed for the first time, accompanied by sporadic pulse events before and after the four sub-surges. The velocity changes and impact range of the four glacier sub-surges showed a trend of first increasing, then stabilizing and finally decreasing. At the same time, the accelerating area gradually moved downstream of the glacier. The changes in glacier elevation and the evolutions in the glacier terminus also proved the occurrence of glacier acceleration events. Sentinel-1 SAR images with shorter time intervals could be used to identify multiple sub-surge events and pulse events within a complete surge. Combining four sub-surges and multiple pulse events, a complete chain of glacier large-scale acceleration events from pulse to surge and then to pulse could be summarized, which might mean that the effective identification of pulse events provides the possibility for the early warning of glacier surge events.","PeriodicalId":15887,"journal":{"name":"Journal of Geophysical Research: Earth Surface","volume":"130 1","pages":""},"PeriodicalIF":3.5,"publicationDate":"2025-01-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143118894","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0