Geomorphology最新文献_第4页

Significance of the physicochemical properties of modern sediments in the Taklimakan Desert for the origin of fluvial-lacustrine deposits in the desert interior 塔克拉玛干沙漠现代沉积物理化性质对沙漠内部河湖沉积成因的意义

IF 3.1 2区地球科学 Q2 GEOGRAPHY, PHYSICAL

Geomorphology

Pub Date : 2026-01-08 DOI: 10.1016/j.geomorph.2026.110171

Aijun Sun , Hui Zhao , Luqi Chai , Xiaoting Jin , Bing Liu , Fujun Meng , Yang Liu , Xingpeng Wang , Fahu Chen

The widely distributed ancient fluvial-lacustrine deposits (FLD) within the Taklamakan Desert are potentially valuable archives for reconstructing paleohydrological changes in this arid region. However, their formation mechanism is poorly constrained due to the lack of a systematic comparison of modern sedimentary processes and these FLD within the desert hinterland. In this study we measured the grain size, geochemical element contents, and color of 77 sediment samples from the Taklamakan Desert. They included 54 samples from 12 stratigraphic sections (FLD layers interbedded within aeolian sands), 13 modern fluvial sediment samples, and 10 modern aeolian sand samples. The FLD had very similar physicochemical characteristics to those of the modern fluvial sediments, but they were distinctly different to the aeolian sands. Integrating sedimentological evidence with geomorphological observations, we propose that flooding events from adjacent river systems during past pluvial periods were the dominant factor in the formation of these FLD. Our systematic physicochemical comparison of paleo-sedimentary sediments with potential modern analogues, provides a robust framework for interpreting the hydrological history of the Taklamakan Desert, with implications for better understanding paleoenvironmental processes in arid Central Asia.

塔克拉玛干沙漠内广泛分布的古河流湖相沉积是重建该干旱区古水文变化的潜在宝贵档案。然而，由于缺乏对沙漠腹地现代沉积过程与这些FLD的系统比较，对它们的形成机制知之甚少。本文对塔克拉玛干沙漠77份沉积物样品的粒度、地球化学元素含量和颜色进行了测定。他们包括来自12个地层剖面的54个样本（FLD层在风成砂中互层），13个现代河流沉积物样本和10个现代风成砂样本。FLD的物理化学特征与现代河流沉积物非常相似，但与风成沙有明显不同。综合沉积学证据和地貌观测，我们认为过去洪积期邻近河流水系的洪水事件是这些FLD形成的主要因素。我们对古沉积沉积物与潜在的现代类似物进行了系统的物理化学比较，为解释塔克拉玛干沙漠的水文历史提供了一个强有力的框架，对更好地理解中亚干旱地区的古环境过程具有重要意义。

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引用次数: 0

Field measurements of Phragmites australis root reinforcement and traits along a riparian zone 沿河岸带芦苇根系加固及性状的田间测定

IF 3.1 2区地球科学 Q2 GEOGRAPHY, PHYSICAL

Geomorphology

Pub Date : 2026-01-07 DOI: 10.1016/j.geomorph.2026.110159

Abhijith Kamath , Jan-willem van de Kuilen

Phragmites australis L., a widespread vegetation in riparian zones such as rivers and canals, is extensively studied for its ecological benefits such as nutrient removal and hydraulic retention. However, its direct contribution to bank stability through root reinforcement, a key factor for its use in soil bioengineering techniques, has received limited attention. This study investigated the root reinforcement provided by P. australis and its root traits at a soil bioengineering test site on a canal bank in the Province of North-Holland in the Netherlands.

Direct measurements of root-soil composite strength were performed using a corkscrew extraction technique at two distinct distances from the canal. Concurrently, root distribution parameters, including Root Area Ratio (RAR) and Root Length Density (RLD), were quantified from extracted soil plugs. Root reinforcement was also indirectly estimated using biomechanical models, incorporating measured root tensile strength and root distribution parameters as inputs. A total of 12 excavations, each 0.25 m², were conducted for comprehensive root trait analysis at both locations.

Direct measurements revealed substantial root reinforcement (max 36 kPa; avg 6–19 kPa). RAR showed effective stabilization values between 0.03 and 0.65 %, peaking at 0.65 % in the area close to canal. Root systems were dominated by fine roots (<0.5 mm diameter), comprising >80 % of total root length and creating dense reinforcing networks. Corkscrew measurements yielded conservative values. Modeled estimates significantly exceeded these field measurements, which is consistent with conventional shear testing. The extensive root surface area (>3.9 m² m⁻²) further demonstrates the species' soil-binding capacity, with higher values occurring in hydrologically favorable zones.

While the ecological implications of using this widespread species must be contextually considered, its pronounced mechanical reinforcement makes it a highly effective biotechnical tool, particularly in managed environments like canals.

芦苇（Phragmites australis L.）是一种广泛分布于河流和运河等河岸带的植被，因其具有去除养分和水力保留等生态效益而被广泛研究。然而，它通过根系加固对河岸稳定的直接贡献——土壤生物工程技术中使用的一个关键因素——却受到了有限的关注。本研究在荷兰北荷兰省运河岸边的土壤生物工程试验点上，研究了南稻对根系的加固作用及其根系性状。根-土复合强度的直接测量是在离运河两个不同距离处使用螺旋拔管技术进行的。同时，对提取的土塞进行根面积比（RAR）和根长密度（RLD）等根分布参数的定量分析。此外，还利用生物力学模型间接估算了根系的强度，将测量到的根系抗拉强度和根系分布参数作为输入。在两个地点共进行了12次挖掘，每次0.25 m2，用于综合根系性状分析。直接测量结果显示，根系有明显的增强（最大36kpa，平均6 - 19kpa）。RAR的有效稳定值在0.03 ~ 0.65%之间，靠近运河的区域达到峰值0.65%。根系以细根（直径0.5 mm）为主，占根系总长度的80%，形成密集的加固网络。开瓶器测量得到保守值。模型估算值大大超过了现场测量值，这与常规剪切试验结果一致。广阔的根表面积（>3.9 m2 m−2）进一步证明了该物种的土壤结合能力，在水文有利的地区出现更高的值。虽然必须考虑使用这种广泛分布的物种的生态影响，但其明显的机械强化使其成为一种非常有效的生物技术工具，特别是在运河等管理环境中。

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引用次数: 0

Insights into red-bed landslide movement from the perspective of geomorphic evolution: A case study in western Yunnan, China 地貌演化视角下的红层滑坡运动——以滇西地区为例

IF 3.1 2区地球科学 Q2 GEOGRAPHY, PHYSICAL

Geomorphology

Pub Date : 2026-01-07 DOI: 10.1016/j.geomorph.2025.110157

Xin Zhao , Xiujun Dong , Zhifang Zhao , Zhiquan Yang , Yi Yang , Mingchun Wen , Yifan Cao

Geomorphic evolution not only records the dynamics of the Earth's surface through a cyclical progression from the youthful stage to an older stage but is also closely intertwined with the current and future development of the Earth's surface. Red-bed landslides are distributed in the red-series continental layered clastic rock formations deposited during the Mesozoic–Cenozoic Eras. Endowed with inherent susceptibility to bedding-parallel sliding and distinct morphological diversity, these landslides constitute a typical geomorphic hazard on the Earth's surface. Those slope movements are inevitably closely linked to geomorphic evolution, which serves as a crucial implicit feature of surface changes. However, the movement characteristics of red-bed landslides from the perspective of geomorphic evolution remain poorly understood, necessitating further investigation into this issue. This paper focuses on the Qinjia red-bed landslide in western Yunnan, China, which remained in a slow-moving state from June 2018 to May 2022. Our research findings were obtained through multidisciplinary approaches, including unmanned aerial vehicle (UAV)-borne light detection and ranging (LiDAR), satellite-based time-series interferometric synthetic aperture radar (InSAR), geomorphic evolution analysis, and digital terrain analysis. Both the geomorphic evolution in the temporal dimension and the surface deformation in the spatial dimension exhibit significant differential distribution characteristics on the Qinjia landslide. The coupling model of the geomorphic evolution and InSAR deformation rate conforms to a significant quadratic function relationship, meaning that as the geomorphic evolution process progresses, the deformation rate exhibits a trend of first increasing and then decreasing. Additionally, areas in the mature stage correspond to the portions where landslide movement is most intense. The spatial distribution of the geomorphic evolution progression across the secondary sliding zones reveals that the sliding pattern of the Qinjia landslide is traction-type. The results of this study supplement the mountain disaster community's understanding of the movement characteristics of landslides from the perspective of geomorphic evolution.

地貌演化不仅记录了地球表面从年轻阶段到老年阶段的周期性进展，而且与地球表面现在和未来的发展密切相关。红层滑坡分布在中新生代沉积的红系陆相层状碎屑岩中。这些滑坡具有顺层平行滑动的固有易感性和独特的形态多样性，是地球表面典型的地貌灾害。这些斜坡运动不可避免地与地貌演化密切相关，地貌演化是地表变化的一个重要隐含特征。然而，从地貌演化的角度对红层滑坡的运动特征了解甚少，需要进一步深入研究。本文以2018年6月至2022年5月处于缓慢移动状态的滇西秦家红层滑坡为研究对象。我们的研究成果是通过多学科方法获得的，包括无人机（UAV）机载光探测和测距（LiDAR）、基于卫星的时序干涉合成孔径雷达（InSAR）、地貌演变分析和数字地形分析。秦家滑坡在时间维度上的地貌演化和空间维度上的地表变形均表现出显著的差异分布特征。地貌演化与InSAR变形率的耦合模型符合显著的二次函数关系，即随着地貌演化过程的进行，变形率呈现先增大后减小的趋势。另外，处于成熟阶段的区域对应着滑坡运动最剧烈的区域。各次生滑坡带地貌演化过程的空间分布特征表明秦家滑坡为牵引型滑坡带。本研究结果补充了山地灾害学界从地貌演化角度对滑坡运动特征的认识。

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引用次数: 0

Quantifying the influencing factors on the spatiotemporal patterns of dune activity in the Tengger Desert, Northwestern China 腾格里沙漠沙丘活动时空格局影响因素量化研究

IF 3.1 2区地球科学 Q2 GEOGRAPHY, PHYSICAL

Geomorphology

Pub Date : 2026-01-06 DOI: 10.1016/j.geomorph.2025.110154

Xuehua Che, Zhuolun Li, Shipei Dong, Jie Luo, Yingyibing Shen, Xue Peng

Eolian dunes are sedimentary landforms that are particularly sensitive to climate change. Dune activity, including dune migration and sand transport, responds rapidly to environmental changes. However, the contribution of environmental factors underlying spatial variations in dune activity remains unclear. To address this issue, we quantify dune activity in the Tengger Desert and assess the dominant influences including: sand supply, vegetation, topography, and climate. In this study, based on Landsat imagery and COSI-Corr technique, we first derive the spatiotemporal characteristics of the dune migration and sand transport flux in the Tengger Desert from 2014 to 2023, then the dominant factors governing dune activity are identified using the Random Forest (RF) model. The results show that the average dune migration rate in the Tengger Desert is 2.1–3.7 m/yr, with a migration direction of ESE-SSE. The average sand transport flux in the desert is 18.89 ± 28.61 m³/m/yr, controlled by a combination of wind energy and sediment availability. Overall, precipitation, wind intensity, topographic relief, and vegetation coverage are the primary controls on dune activity. In regions with annual precipitation below 150 mm, low precipitation plays a dominant role in dune activity. In regions with precipitation exceeding 150 mm, wind intensity and vegetation coverage become the primary controls, leading to the formation of bistable dune landscapes. This study clarifies the dominant factors affecting changes in dune migration and sand flux at the dune scale, which is helpful for understanding desert evolution responding to climate change.

风成沙丘是对气候变化特别敏感的沉积地貌。沙丘活动，包括沙丘迁移和沙输运，对环境变化反应迅速。然而，环境因子对沙丘活动空间变化的影响尚不清楚。为了解决这一问题，我们量化了腾格里沙漠的沙丘活动，并评估了主要影响因素，包括：沙源、植被、地形和气候。基于Landsat影像和cos - corr技术，研究了2014 - 2023年腾格里沙漠沙丘迁移和输沙通量的时空特征，并利用随机森林（Random Forest， RF）模型识别了沙丘活动的主导因子。结果表明：腾格里沙漠沙丘平均迁移速率为2.1 ~ 3.7 m/yr，迁移方向为ESE-SSE；沙漠输沙通量平均为18.89±28.61 m3/m/yr，受风能和泥沙可利用性共同控制。总体而言，降水、风强度、地形起伏和植被覆盖是沙丘活动的主要控制因素。在年降水量小于150mm的地区，低降水对沙丘活动起主导作用。在降水量超过150 mm的地区，风强度和植被盖度成为主要控制因素，形成双稳型沙丘景观。本研究阐明了沙丘尺度上影响沙丘迁移和沙通量变化的主导因素，有助于理解气候变化对沙漠演化的响应。

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引用次数: 0

Sediment yield assessment of a small ungauged montane catchment in the North Caucasus 北高加索山区一个小型未测量集水区的产沙量评估

IF 3.1 2区地球科学 Q2 GEOGRAPHY, PHYSICAL

Geomorphology

Pub Date : 2026-01-05 DOI: 10.1016/j.geomorph.2025.110156

Anatoly Tsyplenkov , Maksim Uspenskii , Sergey Kharchenko , Simon Scheper , Valentin Golosov

Mountain catchments face severe erosion processes, yet sediment transport is rarely measured. Independent methods are needed to assess sediment yield without relying on long-term gauging data. We applied three methods to estimate erosion rates and sediment yield from a 1.84 km² montane catchment located in the North Caucasus. These were: 1) in-situ measurement of the lake sedimentation rate; 2) assessment of erosion rates based on the spatial distribution of geomorphic processes, their rates, and sediment connectivity; and 3) adaptation of the RUSLE model for predicting mean annual soil loss. Based on lake sedimentation rates, the mean annual area-specific sediment yield was 513 t km⁻² yr⁻¹. The spatial distribution and rates of erosion processes indicated that surficial erosion accounts for approximately 83 % of total sediment export, ephemeral streams for 7 %, and rockfalls for 6 %. The remaining contribution comes from soil creep and seasonal solifluction. The RUSLE model, coupled with the morphometric sediment delivery ratio, produced similar, yet 16 % lower, estimates of mean annual sediment yield. This suggests the potential application of this empirical model for ungauged basins in similar montane environments.

山区集水区面临着严重的侵蚀过程，但沉积物的运输很少被测量。需要独立的方法来评估产沙量，而不依赖于长期的测量数据。我们应用了三种方法来估算北高加索地区1.84 km2山地流域的侵蚀速率和产沙量。这包括：1)湖泊沉积速率的原位测量；2)基于地貌过程空间分布、速率和泥沙连通性的侵蚀速率评估；3) RUSLE模型在年平均土壤流失量预测中的应用。基于湖泊沉积速率，平均年面积产沙量为513 t km−2 yr−1。侵蚀过程的空间分布和速率表明，地表侵蚀约占总输沙量的83%，短暂河流约占7%，落石约占6%。其余的贡献来自土壤蠕变和季节性固结。RUSLE模型与形态泥沙输送比相结合，得出了相似的年平均泥沙产出量，但比前者低16%。这表明该经验模型在类似山地环境的未测量盆地中具有潜在的应用价值。

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引用次数: 0

Subsurface variability of sandy coastal geosystems revealed by integrated georadar and cone penetrating testing approach: Insights from the Pays-de-Monts coast (Atlantic France) 综合地质雷达和锥穿测试方法揭示的砂质海岸地质系统的地下变动性：来自Pays-de-Monts海岸（大西洋法国）的见解

IF 3.1 2区地球科学 Q2 GEOGRAPHY, PHYSICAL

Geomorphology

Pub Date : 2026-01-04 DOI: 10.1016/j.geomorph.2025.110153

Julie Billy , Vivien Baudouin , Gildas Noury , Manuel Garcin

Beneath dune fields, the subsurface geology of sandy coastal systems can provide valuable insights for understanding coastal environment. While sandy coasts are often described and monitored through surface geomorphology, their internal structure and geotechnical properties remain poorly documented. To address this limitation, a combined ground-penetrating radar (GPR) and cone penetration testing (CPT) approach was applied along the Pays-de-Monts coast (Atlantic France). This multidisciplinary methodology yields complementary information on the internal architecture, stratigraphic variability, and soil behavior of coastal deposits.

Two sectors were investigated, both characterized by dune fields underlain by fractured limestone and bordered inland by low-lying marshes. Despite their apparent similarities, the sites reveal distinct features. Results provide new insights into (i) the sedimentary units anchoring the sandy coastline, (ii) the connection with adjacent marshes and low-lying environments, (iii) the relationships between dune systems and underlying deposits, and (iv) soil behavior properties linked to depositional environment or dune types themself.

From these findings, two conceptual models are proposed: (1) a prograding sandy coastline with an inland marshward transition overlain by dune field (La Parée Grollier, northern sector), and (2) a channel-fill and spit development sequence overlain by dunes (La Pège-Les 60 Bornes, southern sector). These results demonstrate the value of integrating geophysical and geotechnical methods to improve understanding of coastal geosystems and enabling the identification of site-specific characteristics. More broadly, this study demonstrates and discusses the benefits of integrating GPR-CPT approach for advancing coastal geology and highlights the relevance of local geological models for management and adaptation strategies under climate change.

在沙丘场之下，砂质海岸系统的地下地质可以为理解海岸环境提供有价值的见解。虽然沙质海岸通常是通过地表地貌学来描述和监测的，但它们的内部结构和岩土力学特性仍然缺乏文献记录。为了解决这一问题，在Pays-de-Monts海岸（法国大西洋地区）采用了探地雷达（GPR）和锥形穿透测试（CPT）相结合的方法。这种多学科的方法产生了关于海岸沉积物的内部结构、地层变异性和土壤行为的补充信息。研究人员对两个区域进行了调查，它们的特点都是沙丘区，下面是破碎的石灰岩，内陆与低洼的沼泽接壤。尽管它们有明显的相似之处，但它们的特点却截然不同。研究结果为以下方面提供了新的见解：(i)锚定砂质海岸线的沉积单元，（ii）与邻近沼泽和低洼环境的联系，（iii）沙丘系统与下伏沉积物之间的关系，以及（iv）与沉积环境或沙丘类型本身相关的土壤行为特性。在此基础上，本文提出了两个概念模型：(1)北部La par e Grollier段沙质海岸线的内陆向沼泽过渡，覆盖在沙丘上；(2)南部La p - les 60 Bornes段，覆盖在沙丘上的河道填沙和沙咀发育序列。这些结果表明，将地球物理和岩土工程方法结合起来，可以提高对沿海地质系统的理解，并能够识别特定地点的特征。更广泛地说，本研究展示并讨论了整合GPR-CPT方法对推进沿海地质学的好处，并强调了气候变化下当地地质模型对管理和适应战略的相关性。

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引用次数: 0

Decoding bed armoring: A predictive method for grain size distribution in sand–gravel bed rivers 解码河床盔甲：砂砾河床河流粒度分布的预测方法

IF 3.1 2区地球科学 Q2 GEOGRAPHY, PHYSICAL

Geomorphology

Pub Date : 2026-01-03 DOI: 10.1016/j.geomorph.2025.110152

Zhiyi Feng , Chunhong Hu , Anjun Deng , Chenge An , Maohua Le , Ruiru Lv

Sand–gravel riverbeds downstream of hydraulic projects frequently undergo significant bed armoring. Accurately predicting the grain-size distribution of the armored layer remains a critical yet complex challenge within the field of fluvial dynamics. This study focuses on the response mechanism that connects the progressive reduction in fine sediment content with the evolution of hiding–exposure effects, the consequent alterations in sediment state transition probability, and the subsequent adjustment of the armoring rate during the process of riverbed armoring. An expression for sediment entrainment probability is derived under dynamically varying conditions, which include armoring intensity and the hiding–exposure effects of non-uniform sediments. A three-state exchange mechanism among suspended load, bed load, and bed surface material is integrated into the armoring calculation process. A sediment mass conservation relation under depositional conditions is also formulated, leading to the proposal of a novel stability criterion for bed armoring. Building on these advancements, a predictive method for determining the grain-size distribution of armored layers is developed, explicitly considering sediment exchange processes. Application of this method to the downstream reaches of the Danjiangkou and Three Gorges Reservoirs in China reveals that the predicted grain-size distribution of the armored layer deviates from field measurements by only 2.9 % on average, and from flume experiments by 4.1 %. The findings indicate that the proposed method effectively replicates gradation trends, grain-size distributions of armor layer, and scour depths under clear-water conditions. Furthermore, within the research framework of multi-stage armoring, characterized by the cyclic “formation–destruction–reformation” of armor layers, the method demonstrates considerable potential for applicability.

水利工程下游的砂砾河床经常发生明显的河床铠装。在河流动力学领域，准确预测装甲层的粒度分布仍然是一个关键而复杂的挑战。重点研究了河床成甲过程中细沙含量的逐渐减少与隐藏-暴露效应演化的响应机制，以及由此引起的泥沙状态转变概率的变化，以及随后对成甲速率的调整。导出了动态变化条件下的挟沙概率表达式，包括装甲强度和非均匀沉积物的隐藏-暴露效应。将悬架载荷、床面载荷和床面材料的三态交换机制集成到装甲计算过程中。建立了沉积条件下的沉积物质量守恒关系，从而提出了一种新的床层装甲稳定性判据。在这些进展的基础上，开发了一种确定装甲层粒度分布的预测方法，明确考虑了沉积物交换过程。将该方法应用于丹江口和三峡水库下游，结果表明，预测的甲层粒度分布与实测平均偏差仅为2.9%，与水槽试验平均偏差为4.1%。结果表明，该方法有效地模拟了清水条件下甲壳层的级配趋势、粒度分布和冲刷深度。此外，在以装甲层形成-破坏-改造为循环特征的多级装甲研究框架中，该方法显示出相当大的适用性潜力。

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引用次数: 0

IF 3.1 2区地球科学 Q2 GEOGRAPHY, PHYSICAL

Geomorphology

Pub Date : 2026-01-01

引用次数: 0

IF 3.1 2区地球科学 Q2 GEOGRAPHY, PHYSICAL

Geomorphology

Pub Date : 2026-01-01

引用次数: 0

IF 3.1 2区地球科学 Q2 GEOGRAPHY, PHYSICAL

Geomorphology

Pub Date : 2026-01-01

引用次数: 0