Quaternary Science Advances最新文献_第5页

Landslide susceptibility assessment using the frequency ratio model in the Mae Chan River watershed, northern Thailand 基于频率比模型的泰国北部美灿河流域滑坡易感性评价

IF 2.9 Q2 GEOGRAPHY, PHYSICAL

Quaternary Science Advances

Pub Date : 2025-01-01 DOI: 10.1016/j.qsa.2024.100263

Pichawut Manopkawee, Niti Mankhemthong

A landslide is a significant geological hazard that impacts society, the environment, and local infrastructures. The Mae Chan River watershed, a watershed that is surrounded by high erodible mountains, is particularly vulnerable to landslides. This research aimed to assess the susceptibility of landslides in the unique watershed using the frequency ratio approach. Landslide inventory data were 173 landslide scars in the mountainous region of the watershed. The data were extracted from satellite images that captured historical landslide scars on its surface. Landslide causative factors were selected based on causative elements observed in the watershed that potentially caused the previous landslide occurrences. These inventory data and causative factors were combined to create a landslide susceptibility index and classes. The analysis indicated that around 36 % of the entire watershed was highly prone to landslides, especially in the northwestern and southern high mountains. The remaining 43% and 21% of the watershed's area were classified as moderate and low landslide susceptibility classes, respectively. The landslide susceptibility data's accuracy, reliability, and predictability were verified using the area under the receiver operating characteristic (ROC) curve (AUC) analysis. The AUC values represented the success and prediction rates curve of 0.738 and 0.712, respectively, suggesting that the model performed reasonably well in identifying and predicting landslide susceptibility classes. The study highlights the qualification of landslide susceptibility mapping in a watershed in Thailand to other large-scale landslide hazard research.

滑坡是影响社会、环境和当地基础设施的重大地质灾害。湄陈河流域是一个被高山环绕的流域，特别容易发生山体滑坡。本研究旨在利用频率比法评估独特流域滑坡的易感性。滑坡盘查数据为该流域山区173处滑坡伤痕。这些数据是从卫星图像中提取的，这些图像捕捉到了其表面历史上的滑坡痕迹。根据在流域观测到的可能导致以往滑坡发生的原因因素，选择滑坡成因。将这些调查数据和诱发因素结合起来，形成滑坡易感性指数和等级。分析表明，整个流域约有36%的地区极易发生山体滑坡，特别是在西北和南部的高山地区。其余43%和21%的流域面积分别被划分为中度和低滑坡易感性等级。利用受试者工作特征曲线下面积（AUC）分析验证了滑坡敏感性数据的准确性、可靠性和可预测性。AUC值分别代表0.738和0.712的成功率曲线和预测率曲线，表明该模型在识别和预测滑坡敏感性等级方面具有较好的效果。该研究突出了泰国某流域滑坡易感性制图在其他大规模滑坡灾害研究中的资格。

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引用次数: 0

Mid-to late Holocene palaeogeographic evolution of the Kalamas river delta, Epirus (Thesprotia), Greece 希腊伊庇鲁斯（Thesprotia）卡拉马斯河三角洲全新世中晚期古地理演化

IF 2.9 Q2 GEOGRAPHY, PHYSICAL

Quaternary Science Advances

Pub Date : 2025-01-01 DOI: 10.1016/j.qsa.2024.100264

Antoine Chabrol , Pierre Stephan , Georges Apostolopoulos , Kosmas Pavlopoulos , Adrien Gonnet , Eric Fouache

This paper examines the mid-to-late Holocene palaeogeographical evolution of the Kalamas river delta, the second largest delta in Epirus, Greece, which had previously lacked comprehensive palaeoenvironmental investigation despite its archaeological significance. Through an interdisciplinary approach, the research integrates geomorphological field surveys, Electrical Resistivity Tomography (ERT) profiles, core drilling, sedimentological and microfaunal analyses, associated with radiocarbon dating. The findings reveal four significant phases in the delta's evolution. Initially, freshwater wetlands existed in the southeastern part of the delta until at least 7429-7280 cal. BP. Subsequently, around 6627-6402 cal. BP, a peak in marine transgression established predominantly shallow marine environments. By approximately 5590-5191 cal. BP, accelerated delta progradation led to the development of open and restricted lagoons, likely formed by extensive littoral barriers or sandy spits. From 1874 to 1719 cal. BP, during the Antiquity and particularly during the Roman period, terrestrial alluvial sedimentation became prevalent, with continued delta progradation in subsequent centuries.

These results provide crucial insights into the geomorphological processes that have shaped the Kalamas delta and emphasize the taphonomic biases induced by environmental changes and progradation processes, which may account for the apparent lack of surface archaeological remains—many sites may have been destroyed or buried under sediment.

本文研究了希腊伊庇鲁斯地区第二大三角洲Kalamas河三角洲全新世中晚期的古地理演化，该三角洲虽然具有重要的考古意义，但却缺乏全面的古环境研究。通过跨学科的方法，该研究将地貌实地调查、电阻率断层扫描（ERT）剖面、岩心钻探、沉积学和微动物分析与放射性碳定年相结合。这些发现揭示了三角洲演化的四个重要阶段。最初，淡水湿地存在于三角洲的东南部，直到至少7429-7280 cal. BP。随后，大约6627-6402 cal. BP，海侵高峰建立了以浅海为主的海洋环境。大约5590-5191 cal. BP，三角洲加速退化导致开放和受限泻湖的发展，可能是由广泛的沿海屏障或沙口形成的。从公元前1874年到1719年，在古代，特别是在罗马时期，陆地冲积沉积变得普遍，在随后的几个世纪中继续进行三角洲沉积。这些结果为了解形成卡拉马斯三角洲的地貌过程提供了重要的见解，并强调了由环境变化和沉积过程引起的地貌学偏差，这可能是地表考古遗迹明显缺乏的原因——许多遗址可能已经被破坏或埋在沉积物下。

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引用次数: 0

Surficial geomorphic expressions along the Zanskar shear zone (ZSZ), NW Himalaya, India 印度喜马拉雅西北部赞斯卡尔剪切带地表地貌特征

IF 2.9 Q2 GEOGRAPHY, PHYSICAL

Quaternary Science Advances

Pub Date : 2025-01-01 DOI: 10.1016/j.qsa.2024.100258

Omar Jaan Paul , Khalid Omar Murtaza , Malik Zubair Ahmad , Irfan Maqbool Bhat , Feroz Ahmad , Jehangeer Ahmad Mir , Waseem Qader , Suhail Hussain Sheikh , Shakil Ahmad Romshoo , Reyaz Ahmad Dar

There is substantial evidence of the dynamic interplay between surficial geomorphic processes and active tectonics in the Zanskar Shear Zone (ZSZ), northwest Himalaya, India. The ZSZ is a result of tectonic conversion with a SW–NE orientation that began in the Late Cretaceous and became stronger in the Early Miocene as a result of the collision of the Indian and Eurasian plates. Earlier studies have addressed its tectonic activity and metamorphic activation. However, the contribution of active tectonics to the geomorphic evolution of the region is less understood. Using the Advanced Spaceborne Thermal Emission and Reflection Radiometer (ASTER) Global Digital Elevation Model (GDEM) and Google Earth Imagery, various geomorphic features viz., alluvial fans, triangular facets, wineglass valleys, mountain fronts, knickpoints, and river terraces were identified and delineated. The study area was divided into three river sections viz., Suru, Doda, and Tsarap, running along or occasionally cutting across the strike of the ZSZ. The longitudinal river profiles suggest a relatively higher degree of tectonic activity along the Doda River, followed by the Tsarap and Suru Rivers. This spatial variation in the tectonic activity is also evident from the mountain front sinuosity index, wineglass valley index, triangular facets, and the morphometry of alluvial fans. Both the geomorphic features and morphometric parameters provide evidence of relative variation in the ZSZ activity along the Suru, Doda, and Tsarap River sections. Therefore, the present geomorphic evaluation suggests that the surficial (Quaternary) geomorphology documents the tectonic activity and its spatial variations along the ZSZ.

在印度喜马拉雅西北部的赞斯卡尔剪切带（Zanskar Shear Zone， ZSZ），地表地貌过程与活动构造之间存在动力学相互作用。ZSZ是晚白垩世开始的西南—东北向构造转换的结果，在早中新世由于印度板块与欧亚板块的碰撞而变得更加强烈。早期的研究主要针对其构造活动和变质作用。然而，活动构造对该地区地貌演化的贡献尚不清楚。利用先进星载热发射和反射辐射计（ASTER）全球数字高程模型（GDEM）和谷歌地球图像，识别和描绘了各种地貌特征，即冲积扇、三角形面、葡萄谷、山锋、裂缝点和河流阶地。研究区分为苏鲁河、渡达河和察拉普河三个河段，沿ZSZ走向流动或偶尔横穿ZSZ走向。纵向河流剖面显示沿多达河的构造活动程度相对较高，其次是察拉普河和苏鲁河。山前曲度指数、葡萄谷指数、三角切面和冲积扇形态也反映了构造活动的空间差异性。地貌特征和形态测量参数都提供了沿苏鲁河、多达河和察拉普河段ZSZ活动相对变化的证据。因此，目前的地貌评价表明，地表（第四纪）地貌记录了ZSZ的构造活动及其空间变化。

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引用次数: 0

Neanderthals’ recolonizations of marginal areas: An overview from Eastern Germany 尼安德特人在边缘地区的再殖民：来自东德的概述

IF 2.9 Q2 GEOGRAPHY, PHYSICAL

Quaternary Science Advances

Pub Date : 2025-01-01 DOI: 10.1016/j.qsa.2024.100260

Andrea Picin

The Middle Paleolithic in Eastern Germany presents a unique context for understanding Neanderthal populations' dynamics within environmental shifts. The cyclical ice-sheet growth and advancements during the late Middle and Late Pleistocene caused occupational gaps in North-western and Central Europe and recurring episodes of recolonization from the southern regions. From cold tundra and steppe landscapes to forested habitats during climatic amelioration, these environmental changes significantly influenced Neanderthal settlement patterns and adaptive strategies. In this study, the lithic assemblages from some Middle Paleolithic sites stretched between Saxony and Saxony-Anhalt are analyzed. Despite migrations occurring over millennia, our study reveals that the unidirectional reduction scheme was continuously applied to different knapping methods remaining a common technological substrate during the whole Middle Paleolithic. The introduction of asymmetric bifacial tools during MIS 5c/MIS 5a did not alter predominant flake production methods. Contrariwise to support a techno-cultural stasis lasted several millennia, this study reveals that this technical continuity could be related to the changes in raw material size occurred during the Middle Pleistocene. Large erratic flint nodules during the Elsterian glaciation promoted loss-making behaviors, while the transport of smaller nodules during the Drenthe glaciation encouraged more intensive exploitation of pebbles during the Late Middle Paleolithic. By shedding light on Neanderthal lifeways, technological adaptations, and settlement patterns in Eastern Germany, this research contributes to a nuanced understanding of their behavior amidst evolving environmental conditions.

德国东部的旧石器时代中期为理解尼安德特人在环境变化中的动态提供了一个独特的背景。在中更新世晚期和晚更新世期间，周期性的冰盖生长和推进造成了欧洲西北部和中部的职业差距，以及南部地区反复出现的再殖民事件。从寒冷的苔原和草原景观到气候改善期间的森林栖息地，这些环境变化显著影响了尼安德特人的定居模式和适应策略。本研究分析了萨克森州和萨克森-安哈特州之间的一些中旧石器时代遗址的石器组合。尽管迁移发生了数千年，但我们的研究表明，在整个中旧石器时代，单向还原方案持续应用于不同的敲击方法，仍然是一种常见的技术基础。在MIS 5c/MIS 5a期间引入不对称双面工具并没有改变主要的薄片生产方法。相反，为了支持持续了几千年的技术文化停滞，这项研究表明，这种技术连续性可能与中更新世期间发生的原材料尺寸变化有关。埃尔斯特冰期的大型不稳定燧石结核促进了损失行为，而德伦特冰期较小结核的运输促进了旧石器时代中期晚期对鹅卵石的更密集开采。通过揭示尼安德特人在德国东部的生活方式、技术适应和定居模式，这项研究有助于细致入微地了解他们在不断变化的环境条件下的行为。

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引用次数: 0

The Quaternary La Garrotxa volcanic field (NE of Iberia): A geochronological approach 第四纪La Garrotxa火山场（伊比利亚东北部）：地质年代学研究

IF 2.9 Q2 GEOGRAPHY, PHYSICAL

Quaternary Science Advances

Pub Date : 2025-01-01 DOI: 10.1016/j.qsa.2025.100267

Joan Martí , Julia Ricci , Llorenç Planagumà , Gerardo J. Aguirre Díaz

Monogenetic volcanic fields exhibit extended periods of magmatic activity, often spanning several million to tens of millions of years. Understanding the evolution of this activity is challenging due to incomplete geological records and limited geochronological data. However, the relative volcanic stratigraphy and morphometric analysis of volcanic landforms enable the identification of temporal patterns in volcanic activity. These patterns often reveal clusters of eruptions interspersed with periods of relative inactivity, reflecting the tectonic evolution of the region, which influences magma generation and ascent.

Quantifying this temporal evolution is crucial for Quaternary monogenetic fields, as their activity may still be ongoing, posing potential risks. This is exemplified by the La Garrotxa volcanic field in the Catalan Volcanic Zone, part of the European Rift System, active from the mid-Pleistocene to the early Holocene. In this study, we present 15 new Ar-Ar ages, along with a comprehensive field review, to accurately establish the recent temporal evolution of this volcanic field, refining previous stratigraphies based solely on field relations and morphometric analysis. These new ages indicate that volcanic activity in the La Garrotxa Volcanic Field is more recent and frequent than previously believed, with significant implications for volcanic hazard assessment.

单成因的火山场表现出延长的岩浆活动期，通常跨越几百万到数千万年。由于不完整的地质记录和有限的地质年代学数据，了解这种活动的演变是具有挑战性的。然而，相对火山地层学和火山地貌的形态计量学分析使得火山活动的时间模式得以识别。这些模式往往揭示了火山喷发群穿插在相对不活跃的时期，反映了该地区的构造演化，这影响了岩浆的产生和上升。量化这种时间演变对第四纪单成因场至关重要，因为它们的活动可能仍在进行中，构成潜在的风险。作为欧洲裂谷系的一部分，加泰罗尼亚火山区的La Garrotxa火山场活跃于中更新世至全新世早期。在这项研究中，我们提出了15个新的Ar-Ar年龄，并进行了全面的现场回顾，以准确地建立该火山场的近期时间演化，完善了以前仅基于场关系和形态计量学分析的地层。这些新时代表明，La Garrotxa火山田的火山活动比以前认为的更近、更频繁，这对火山危险性评估具有重要意义。

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引用次数: 0

Evaluation of rock slope stability using field, laboratory, and numerical methods: A case study of critical road sections from Morka- Chencha, in Southern Ethiopia 使用现场、实验室和数值方法评价岩质边坡稳定性：以埃塞俄比亚南部Morka- Chencha关键路段为例

IF 2.9 Q2 GEOGRAPHY, PHYSICAL

Quaternary Science Advances

Pub Date : 2025-01-01 DOI: 10.1016/j.qsa.2025.100273

Hayat Abdela , Bayisa Regassa , Tola Garo , Addisu Bekele

Slope failure is one of the most common geo-environmental natural hazards on steep and mountainous terrain the worldwide resulting in human loss and damage to civil engineering infrastructure. In Southern Ethiopia the road connecting Morka Gircha, and Chencha passes through steep hillside mountains and deep valleys. As a part of this study, slope stability along selected road sections was determined and evaluated, and remedial solutions were provided on the basis of field investigations and numerical analysis. For this study, field research included discontinuity surveys, in situ rock testing, rock sampling for laboratory analysis, slope geometry, and orientation measurements. Field observations revealed that four crucial rock slope sections were selected for stability analysis assessment. Kinematic assessments via Dips software at slope sections RS2 and RS4 revealed the planar kinds of rock slope failure. Further stability analysis via the RocPlane program revealed that the crucial rock slope sections at RS2 are unstable under all anticipated conditions. However, the rock critical slope segment at RS4 remains stable under static dry, dynamic dry, and static saturated conditions and unstable under dynamic saturated conditions. Furthermore, a stability study was conducted via limit equilibrium and finite element methods for static dry, static saturated, dynamic dry, and dynamic saturated loading scenarios at crucial rock slope sections RS1 and RS5. This study's performance analysis of geometric profiles indicates that variations of slope height and slope angle lead to greater slope stability. This shows that the factor of safety values in both the LEM and FEM change as the slope angle and slope height decrease. Furthermore, the study reveals that the insertion of rock bolts at planar failure sites increases the FOS slope.

边坡破坏是世界范围内最常见的地质环境自然灾害之一，它不仅给人类造成了巨大的损失，而且给土木工程基础设施造成了严重的破坏。在埃塞俄比亚南部，连接Morka Gircha和Chencha的公路穿过陡峭的山坡山脉和深谷。作为本研究的一部分，对选定路段的边坡稳定性进行了确定和评价，并在现场调查和数值分析的基础上提出了修复方案。在这项研究中，现场研究包括不连续面调查、原位岩石测试、实验室分析岩石取样、边坡几何形状和方向测量。现场观测结果表明，选取了4个关键岩质边坡断面进行稳定性分析评价。利用dip软件对RS2和RS4段进行运动学评价，揭示了岩石边坡的平面破坏类型。通过RocPlane程序进行的进一步稳定性分析表明，在所有预期条件下，RS2的关键岩质边坡截面都是不稳定的。而RS4岩质临界边坡段在静干、动干、静饱和条件下均保持稳定，在动饱和条件下不稳定。通过极限平衡法和有限元法对关键岩质边坡RS1和RS5段静干、静饱和、动干和动饱和荷载情况进行了稳定性研究。本研究对几何剖面的性能分析表明，坡高和坡角的变化对边坡稳定性有较大影响。这表明LEM和FEM的安全系数随坡角和坡高的减小而变化。此外，研究表明，锚杆在平面破坏部位的插入增加了FOS边坡。

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引用次数: 0

Effect of heat treatment on geotechnical and microstructural properties of expansive soils 热处理对膨胀土岩土力学和微观结构特性的影响

IF 2.9 Q2 GEOGRAPHY, PHYSICAL

Quaternary Science Advances

Pub Date : 2025-01-01 DOI: 10.1016/j.qsa.2024.100262

Mebrate Tamiru, Eleyas Assefa, S.M. Assefa, Nagessa Zerihun Jilo

This paper explores the effects of heating on the geotechnical and microstructural properties of natural expansive soil found in Sendafa, Ethiopia. Expansive soils, known for their volume changes with moisture variation, pose significant challenges. Traditional methods for improving these soils include using lime, cement, and agricultural wastes. However, this study focuses on heat treatment as an alternative approach to enhance the soil geotechnical behavior. Classified as A7-6 and CH according to the AASHTO and USCS classifications, the soil samples underwent heating in a micro-oven at temperatures of 200 °C, 400 °C, 600 °C, and 800 °C for 1 h. Notably, the soil index properties showed improvement starting at 400 °C. With increased temperatures, dry density rose while optimum moisture content decreased. Furthermore, unconfined compressive strength and swelling pressure dropped as the heating temperature escalated, and the clay minerals composition was reduced due to calcination and dehydration processes. SEM analysis revealed a transformed microstructure, with the soil appearing cinder (scoria)-like, exhibiting a more flocculated, aggregated, and well-integrated layered structure. This study underscores the potential of heat treatment for stabilizing expansive soils, recommending a minimum temperature of 400 °C for effective results.

本文探讨了加热对埃塞俄比亚森达法天然膨胀土的岩土和微观结构特性的影响。膨胀土以其体积随湿度变化而变化而闻名，这构成了重大挑战。改良这些土壤的传统方法包括使用石灰、水泥和农业废料。然而，本研究的重点是热处理作为一种替代方法来提高土壤的岩土力学行为。根据AASHTO和USCS分类，土壤样品被分类为A7-6和CH，在200°C、400°C、600°C和800°C的微烤箱中加热1小时。值得注意的是，土壤指标性质从400°C开始有所改善。随着温度的升高，干密度升高，最适含水率降低。随着加热温度的升高，无侧限抗压强度和膨胀压力下降，并且由于煅烧和脱水过程，粘土矿物成分减少。SEM分析显示土壤微观结构发生了变化，呈现出类似煤渣的形态，表现出更絮状、聚集和良好整合的层状结构。这项研究强调了热处理稳定膨胀土的潜力，建议最低温度为400°C以获得有效结果。

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引用次数: 0

Fault growth and rupture history based on displacement distribution along the Luoshan Fault, NW China 基于位移分布的罗山断裂带断裂生长与破裂史研究

IF 2.9 Q2 GEOGRAPHY, PHYSICAL

Quaternary Science Advances

Pub Date : 2024-11-26 DOI: 10.1016/j.qsa.2024.100255

Haoyu Zhou , Wenjun Zheng , Dongli Zhang , Xin Sun , Bingxu Liu , Shiqi Wei , Guang Yang

The growth and development of faults are driven by repetitive earthquakes, which accumulate displacement and extend rupture lengths. This process changes fault morphology, resulting in surface ruptures that are preserved in the geomorphology as displaced landforms. High-resolution geomorphic data enable the precise acquisition of these displaced landforms, facilitating detailed analysis of slip distributions along faults and offering quantitative constraints on the growth and rupture history of faults. In this study, an airborne light detection and ranging (LiDAR) system was employed to obtain 0.5-m resolution geomorphic data >500 m long on both sides of the Luoshan Fault on the northeastern Tibetan Plateau. By interpreting and distinguishing different geomorphic markers, we identified and measured 436 right-lateral offsets along the Luoshan Fault. Based on statistical analysis methods, we determined that there were six strong earthquakes within 10 m of the cumulative displacement along the Luoshan Fault. Except for the latest event, the other five strong events showed regular displacement increments of approximately 1.9 m, revealing a strong earthquake pattern of approximate characteristic slip. The different cumulative displacement distributions correspond to various stages of fault growth. The growth pattern of the Luoshan Fault evolves from fault tip propagation and linkage (Events 1–5) to a mode of growth with a constant fault length but increased cumulative displacement (Event 6). Based on the displacement distribution along the Luoshan Fault, the northern segment is more likely to experience earthquake events, with magnitudes ranging from Mw 6.84 to 7.12.

断层的生长发育是由反复地震驱动的，这些地震积累了位移，延长了断裂长度。这一过程改变了断层形态，导致地表破裂，这些破裂作为移位的地貌保存在地貌学中。高分辨率的地貌数据可以精确获取这些位移地貌，便于对断层滑动分布进行详细分析，并为断层的生长和破裂历史提供定量约束。本研究利用机载光探测与测距（LiDAR）系统，对青藏高原东北部罗山断裂带两侧500 m长的0.5 m分辨率地貌数据进行了采集。通过对不同地貌标志的解释和区分，确定并测量了罗山断裂带的436个右侧偏移。利用统计分析方法，确定了沿罗山断裂带累计位移10 m范围内发生了6次强震。除最近一次强震外，其余5次强震均表现出约1.9 m的规律性位移增量，呈现出近似特征滑动的强震模式。不同的累积位移分布对应于断层发育的不同阶段。罗山断裂的发育模式由断裂尖端扩展联动（事件1-5）演变为断层长度不变但累积位移增大（事件6）的发育模式。根据罗山断裂的位移分布，北段发生地震的可能性较大，震级在Mw 6.84 ~ 7.12之间。

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引用次数: 0

In-situ and modelled debris thickness distribution on Panchi Nala Glacier (western Himalaya, India) and its impact on glacier state 潘奇纳拉冰川（印度喜马拉雅山西部）的原地和模型碎屑厚度分布及其对冰川状态的影响

IF 2.9 Q2 GEOGRAPHY, PHYSICAL

Quaternary Science Advances

Pub Date : 2024-11-21 DOI: 10.1016/j.qsa.2024.100254

Purushottam Kumar Garg , Mohd Farooq Azam , Iram Ali , Aparna Shukla , Arindan Mandal , Himanshu Kaushik

This study presents extensive in-situ debris thickness measurements over the Panchi Nala Glacier (western Himalaya, India) and models its spatial distribution using remote sensing and ERA-5 reanalysis data. A rigorous comparison of in-situ and modelled debris thickness and a systematic assessment of its influence on glacier state (2000–2019) are also made. In-situ measurements reveal debris thickness ranging from 0 to 70 ± 0.25 cm. Modelled debris thickness ranges from 0 to 64 ± 1.75 cm. Debris thickness pattern is such that it increases from centre to margins and snout to upglacier. In-situ and modelled debris thickness show a good positive correlation (r = 0.73; p < 0.05). Further, the glacier-wide mass balance is −0.51 ± 0.09 m w.e./y. Modelled debris thickness showed a moderate positive correlation (r = 0.66; p < 0.05) with surface lowering, indicating reduced melt under thick debris. These moderate-to-good correlations in both cases can be ascribed to the inability of coarse resolution data to capture small supraglacial feature variations. Also, thicker debris over margins probably protected it, manifested through limited area loss (0.13 ± 0.2%/y) and snout retreat (5.9 ± 1.6 m/y). Results show higher thinning over the upper ablation zone (4725–4925 m asl) compared to the lower ablation zone (4546–4725 m asl), likely induced by typical debris distribution, has reduced the glacier-tongue's slope (6.7°). Gentle glacier-tongue in a negative mass balance regime with growing debris (0.3 ± 0.2%/y) has become conducive to supraglacial ponds and ice cliffs development, which now dominate ablation processes. Overall, the study presents crucial data on debris thickness and provides vital insights into glacier evolution.

本研究利用遥感和ERA-5再分析数据，对潘奇纳拉冰川（印度喜马拉雅山西部）的碎屑厚度进行了广泛的实地测量，并对其空间分布进行了建模。此外，还对原位碎片厚度和建模碎片厚度进行了严格比较，并系统评估了碎片厚度对冰川状态（2000-2019 年）的影响。原位测量显示碎屑厚度范围为 0 至 70 ± 0.25 厘米。模拟的碎屑厚度范围为 0 至 64 ± 1.75 厘米。碎屑厚度的变化规律是，从冰川中心到边缘，从冰川鼻端到上冰川，碎屑厚度不断增加。原位和模拟的碎屑厚度显示出良好的正相关性（r = 0.73; p < 0.05）。此外，整个冰川的质量平衡为-0.51 ± 0.09 m w.e./y。模拟的碎屑厚度与地表下降呈中度正相关（r = 0.66; p <0.05），表明厚碎屑下的融化减少。这两种情况下的中度到良好相关性可归因于粗分辨率数据无法捕捉到微小的上冰川特征变化。此外，边缘较厚的碎屑可能对其起到了保护作用，表现为有限的面积损失（0.13 ± 0.2%/年）和鼻端后退（5.9 ± 1.6 米/年）。结果表明，上消融带（海拔 4725-4925 米）比下消融带（海拔 4546-4725 米）的消融程度更高，这可能是由于典型的碎屑分布造成的，从而降低了冰川舌的坡度（6.7°）。由于碎屑不断增加（0.3 ± 0.2%/年），处于负质量平衡状态的温和冰川舌有利于超冰川池塘和冰崖的形成，而这两种现象目前在消融过程中占主导地位。总之，该研究提供了有关碎屑厚度的重要数据，并为冰川演变提供了重要见解。

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引用次数: 0

Tracing drainage capture between the two large tributaries of the Yangtze River in the southeastern Tibetan plateau: Insights from detrital apatite fission-track thermochronology 追溯青藏高原东南部长江两大支流之间的排水捕获：非晶磷灰石裂变轨道热年代学的启示

IF 2.9 Q2 GEOGRAPHY, PHYSICAL

Quaternary Science Advances

Pub Date : 2024-10-28 DOI: 10.1016/j.qsa.2024.100252

Rong Yang, Rongyan Li, Cheng Su, Junqing He, Chenchao Xu, Xuhua Shi, Hanlin Chen

The evolution of drainage patterns in the southeastern Tibetan Plateau remains a highly controversial topic. In this study, we provide solid evidence that the Dadu and Anning Rivers, located in the southeastern Tibetan Plateau, have undergone reorganization after the plateau uplift. Through detrital apatite fission-track dating on modern sediments from both rivers, as well as the upper Pliocene - lower Pleistocene Xigeda Formation of the Anning, we reveal that the modern sediments of the Dadu River are dominated by young AFT ages (<5 Ma), consistent with the bedrock ages in its drainage basin. Similarly, the Anning modern sediments and the Xigeda Formation exhibit a significant portion of young ages (peaking at 4.2 and 4.4 Ma, respectively), contrasting with the older ages observed in the bedrocks of the Anning drainage basin but comparable to those of the Dadu drainage basin. We conclude that the Anning and Dadu Rivers were connected during the deposition of the Xigeda Formation, and the modern Anning River receives significant recycled sediments from this formation.

青藏高原东南部排水格局的演变仍是一个极具争议的话题。在这项研究中，我们提供了确凿的证据，证明位于青藏高原东南部的大渡河和安宁河在高原隆升之后经历了重组。通过对这两条河流的现代沉积物以及安宁河上新世-下更新世西格达地层的非晶磷灰石裂轨测年，我们发现大渡河现代沉积物以年轻的AFT年龄（<5 Ma）为主，与其流域基岩年龄一致。同样，安宁现代沉积物和西格达地层也显示出相当一部分年轻的年龄（峰值分别为 4.2 和 4.4 Ma），与安宁流域基岩中观察到的较老年龄形成对比，但与大渡河流域的基岩年龄相当。我们的结论是，安宁河和大渡河在西格达地层沉积期间是相通的，现代安宁河从该地层获得了大量的循环沉积物。

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引用次数: 0