Article
Chemistry, Multidisciplinary
Carmen Marin-Buzon, Antonio Miguel Perez-Romero, Manuel J. Leon-Bonillo, Ruben Martinez-Alvarez, Juan Carlos Mejias-Garcia, Francisco Manzano-Agugliaro
Summary: The study aimed to compare two geomatics techniques in archaeological excavations, focusing on accuracy and errors, especially in altimetry. It was found that Structure from Motion (SfM) photogrammetry was the most accurate and least limiting for use in semi-buried archaeological excavations, opening new perspectives for its application in such contexts.
APPLIED SCIENCES-BASEL
(2021)
Article
Geography, Physical
Ci-Jian Yang, Chia-Hung Jen, Yeuan-Chang Cheng, Jiun-Chuan Lin
Summary: Understanding the impact of mudcracks on erosion is essential for studying changes in hillslope morphology and soil erosion. Through laboratory experiments and TLS technology, this study quantified the effects of mudcracks on slope erosion, highlighting the potential of high-resolution topographic surveys for identifying and characterizing micro-relief-induced erosion.
Article
Environmental Sciences
Luka Jurjevic, Mateo Gasparovic, Xinlian Liang, Ivan Balenovic
Summary: This study evaluated the accuracy of close-range remote sensing techniques for DTM data collection in forest areas, and found that these techniques can achieve higher accuracy compared to airborne laser scanning and digital aerial photogrammetry data.
Article
Optics
Ashraf A. A. Beshr, Hossam El-Din Fawzy, Ehab A. A. Eldin, Jong Wan Hu, Fathi A. Abdelmgeed
Summary: This paper introduces the application of digital measuring techniques, specifically Digital Close Range Photogrammetry (DCRP), in the detection of deformation in post-tensioned structural elements (PTSEs). The use of digital equipment and a terrestrial laser scanner (TLS) allows for highly accurate monitoring of PTSE camber, with deviations not exceeding 0.01 mm.
OPTICS AND LASER TECHNOLOGY
(2024)
Article
Geography, Physical
Karel Kuzelka, Peter Surovy
Summary: Terrestrial close-range photogrammetry provides a low-cost method for 3D reconstruction of forest stands, with optimal photographer trajectories essential for efficient coverage and tree diameter estimation. The study used mathematical optimization and simulated image sequences to determine the most effective trajectories for capturing images in forest stands, highlighting the importance of trajectory selection for automatic tree detection and diameter estimation.
ISPRS JOURNAL OF PHOTOGRAMMETRY AND REMOTE SENSING
(2021)
Article
Forestry
Yanqi Dong, Guangpeng Fan, Zhiwu Zhou, Jincheng Liu, Yongguo Wang, Feixiang Chen
Summary: This paper develops an automatic modeling method based on AdQSM, provides a low-cost technical scheme for tree structure modeling, and compares the parameters extracted from AdQSM with reference values.
Article
Engineering, Multidisciplinary
Jakub Siwiec, Grzegorz Lenda
Summary: This study aims to combine the TLS and SFM methods for measuring a 120m industrial chimney. The results show that with full point cloud coverage, the internal consistency of each method is achieved within a few millimeters, while the external consistency is around 10mm. Although the TLS consistency deteriorates as elevation increases, the integration of both measurement methods is still possible, even in areas with partial point cloud coverage. The integration was successful within a length of about 55m, with an average error of 13mm.
Article
Environmental Sciences
Pengfei Li, Fangli Ren, Jinfei Hu, Lu Yan, Mingkui Hao, Lifeng Liu, Jianjian Gao, Tianmin Dang
Summary: This study compared the performance of terrestrial laser scanning (TLS) and structure-from-motion (SfM) photogrammetry for field erosion monitoring. The results showed that TLS and SfM produced comparable soil loss estimates, with TLS performing better in highly eroded areas and SfM performing better in less eroded areas. The study also highlighted the potential of using a combination of TLS and SfM for more accurate results.
LAND DEGRADATION & DEVELOPMENT
(2023)
Article
Environmental Sciences
Antonio Tomas Mozas-Calvache, Jose Miguel Gomez-Lopez, Jose Luis Perez-Garcia
Summary: This study presents a methodology for documenting archaeological areas by utilizing geomatic techniques such as LiDAR and photogrammetry. The approach involves obtaining products at various scales and dates to model the evolution of the archaeological work. The methodology successfully combines LiDAR point clouds with photogrammetry to enhance the geometry and texture of the obtained results. The study demonstrates the feasibility of this methodology and integrates all the outcomes into an interactive website.
Article
Environmental Sciences
Guillaume Brunier, Simon Oiry, Yves Gruet, Stanislas F. Dubois, Laurent Barille
Summary: In this study, a UAV-based survey was conducted in October on Noirmoutier Island in France to map the distribution of reefs and the colonization of epibionts using topographic indices and multispectral indices. The results provide data support for further research on the health index of intertidal reefs.
Article
Agriculture, Multidisciplinary
Guoqi Chai, Yufeng Zheng, Lingting Lei, Zongqi Yao, Mengyu Chen, Xiaoli Zhang
Summary: A model is proposed to estimate crown parameters in high-density forests using tree spacing, diameter at breast height (DBH), and stand age. The model demonstrates good performance in subtropical Chinese forests with TLS data and shows applicability to CRP. It provides an efficient solution for automatic and accurate measurement of crown parameters, supporting fine forest management and carbon stock estimation.
COMPUTERS AND ELECTRONICS IN AGRICULTURE
(2023)
Article
Geochemistry & Geophysics
Zihan Liang, Zhanyu Wei, Wen Sun, Qitian Zhuang
Summary: The characteristics of earthquake surface ruptures are crucial for earthquake hazard studies. Utilizing high-resolution topographic data and field observations, this study revealed the detailed surface ruptures of the 1931 Fuyun earthquake, China, which was identified as a cascade rupture formed by four rupture segments.
Article
Engineering, Multidisciplinary
Remzi Eker
Summary: This study aimed to compare a handheld mobile laser scanning (HMLS), called TORCH using SLAM algorithm, and a PPK-integrated close-range terrestrial photogrammetry (CRTP) for measuring forest road surface deformation. The PPK-integrated CRTP, which includes a multiband GNSS-module and a camera mounted on a 5-m prism pole, provided denser 3D point clouds than HMLS. However, the difference in mean deformation values between the two methods was statistically significant only for the second period. Both methods can be suggested for measuring forest road surface deformation, considering their limitations.
Article
Remote Sensing
Martin Mokros, Tomas Mikita, Arunima Singh, Julian Tomastik, Juliana Chuda, Piotr Wezyk, Karel Kuzelka, Peter Surovy, Martin Klimanek, Karolina Zieba-Kulawik, Rogerio Bobrowski, Xinlian Liang
Summary: The development of devices capable of generating 3D point clouds of the forest has flourished in recent years. Low-cost technologies such as MultiCam, iPad Pro, GeoSlam Horizon, and FARO Focus s70 were compared for tree detection and diameter at breast height estimation. Results showed that TLS provided the most accurate data, while iPad Pro achieved results closest to TLS when DBH > 7 cm.
INTERNATIONAL JOURNAL OF APPLIED EARTH OBSERVATION AND GEOINFORMATION
(2021)
Article
Ecology
Marjorie Roscian, Anthony Herrel, Raphael Cornette, Arnaud Delapre, Yves Cherel, Isabelle Rouget
Summary: Researchers have developed a new underwater photogrammetry protocol to reconstruct 3D models of dry-sensitive objects such as cephalopod beaks, providing a fast, efficient, and accurate method for quantitative morphological analysis.
ECOLOGY AND EVOLUTION
(2021)
Article
Geography, Physical
Daniel J. Brogan, Lee H. MacDonald, Peter A. Nelson, Jacob A. Morgan
Article
Environmental Sciences
Jacob A. Morgan, Peter A. Nelson
WATER RESOURCES RESEARCH
(2019)
Article
Geography, Physical
Jacob A. Morgan, Nirnimesh Kumar, Alexander R. Horner-Devine, Shelby Ahrendt, Erkan Istanbullouglu, Christina Bandaragoda
Article
Environmental Sciences
Stephanie K. Kampf, Benjamin M. Gannon, Codie Wilson, Freddy Saavedra, Mary Ellen Miller, Aaron Heldmyer, Ben Livneh, Peter Nelson, Lee MacDonald
JOURNAL OF ENVIRONMENTAL MANAGEMENT
(2020)
Article
Geography, Physical
Jacob A. Morgan, Peter A. Nelson
Summary: Gravel-bed rivers typically have shallow riffles in wide sections and deeper pools in narrow areas. This study investigated how two different channel geometries, constant-width and variable-width, respond to changing flow and sediment supply in a flume experiment. The results showed that the variable-width channel developed bed undulations representing riffle-pools, while the straight channel had a significant increase in slope with increased sediment supply. Pool elevation changes were twice the distance of bar elevations, highlighting the importance of pool scour for riffle-pool self-maintenance in channels with width variations.
EARTH SURFACE PROCESSES AND LANDFORMS
(2021)
Article
Engineering, Geological
Sujana Timilsina, Jeffrey D. Niemann, Sara L. Rathburn, Francis K. Rengers, Peter A. Nelson
Summary: During a seven-day extreme rainfall event in September 2013 in the Colorado Front Range, it was observed that south-facing slopes were more prone to experiencing debris flows compared to north-facing slopes. By analyzing soil moisture patterns and hydrologic processes, it was determined that differences in interception and deep drainage were the primary factors leading to the saturation of south-facing slopes. The final model predicted instability at around 72% of observed debris flow initiation sites.
Article
Geosciences, Multidisciplinary
Tingan Li, Jeremy G. Venditti, Colin D. Rennie, Peter A. Nelson
Summary: Approximating the stresses on the bed and walls of confined, narrow bedrock rivers is crucial for accurately understanding hydraulic roughness, sediment transport, bedrock erosion, and the dynamics of bedrock channels. Through the use of the ray-isovel model (RIM) and field observations, this study found that the distribution of shear stress across an idealized trapezoidal channel is influenced by the angle of the river banks and the width-to-depth ratio. The study also revealed that the complex flow structure in bedrock canyons affects the distribution of bed and wall stresses, with the bedrock walls contributing more hydraulic roughness than predicted by the RIM model.
JOURNAL OF GEOPHYSICAL RESEARCH-EARTH SURFACE
(2022)
Article
Environmental Sciences
Shelby Ahrendt, Alexander R. Horner-Devine, Brian D. Collins, Jacob A. Morgan, Erkan Istanbulluoglu
Summary: Changes in the severity and likelihood of flooding events are not only associated with changes in the intensity and frequency of streamflows, but also with adjustments in a river's conveyance capacity. The study reveals that in unregulated rivers, moderate floods have increased across the region, while in regulated rivers, this trend is suppressed or even reversed. Variations in channel conveyance are widespread, but the magnitude and timing of adjustments are not consistent. The relative importance of conveyance variability for flood risk depends on the mode of adjustment.
WATER RESOURCES RESEARCH
(2022)
Article
Geography, Physical
Julianne Scamardo, Peter A. Nelson, Mary Nichols, Ellen Wohl
Summary: Compared to perennial streams, there is a lack of studies investigating the impact of large wood on sediment transport and river corridor morphology in ephemeral streams. Both large wood and vegetation effectively confine flow to the main channel, causing it to become wider and deeper. Large wood enhances channel change caused by vegetation, but vegetation has a greater influence on channel morphology due to its larger area within the stream corridor.
Article
Environmental Sciences
Brian M. Murphy, Kathryn L. Russell, Simon Mould, Geoff Vietz, Peter A. Nelson
Summary: Urban riverscapes play a crucial role in urban planning and development, but they often suffer from degradation. To effectively manage urban riverscapes, a comprehensive assessment considering human values, hydrology, geomorphology, and ecology is necessary. This assessment can be conducted at multiple scales and provides guidance for enhancing riverscape function and urban vitality.
JOURNAL OF ENVIRONMENTAL MANAGEMENT
(2022)
Article
Environmental Sciences
Wuming Ni, Jacob A. Morgan, Alexander R. Horner-Devine, Nirnimesh Kumar, Shelby Ahrendt
Summary: This research investigates the influence of sea level rise (SLR) on riverine flooding in estuaries by simulating the morphodynamic evolution of an idealized estuary under different SLR scenarios. The results show that the estuarine response to SLR is affected by both morphological changes and changes in channel hydrodynamics. Interestingly, more severe SLR scenarios lead to a decrease in flood extent in upstream areas due to tidal energy penetration and erosion, which increases the channel capacity locally.
WATER RESOURCES RESEARCH
(2022)
Article
Geosciences, Multidisciplinary
Daniel C. White, Peter A. Nelson
Summary: Meandering gravel-bed rivers exhibit sorting patterns with fine particles on bar tops and coarse particles in pools. The mechanism behind these patterns is poorly understood for gravel-bed meandering channels.
JOURNAL OF GEOPHYSICAL RESEARCH-EARTH SURFACE
(2023)
Article
Geography, Physical
Daniel J. Brogan, Peter A. Nelson, Lee H. MacDonald
EARTH SURFACE DYNAMICS
(2019)
Article
Geography, Physical
A. Securo, C. Del Gobbo, L. Rettig, S. Pillon, A. De Luca, D. Fontana, E. Benedetti Fasil, R. R. Colucci
Summary: Small glaciers in temperate mountain regions have experienced significant reduction and unprecedented melt rates in recent years. Some glaciers have transitioned from clean ice to debris-covered or even rock glaciers. This study examines the surface elevation change of the Popera Alto glacier in the Sesto Dolomites using LiDAR and Structure from Motion surveys, and analyzes its evolution in terms of surface cover and geomorphic processes. The glacier has lost an average of 0.35 m water equivalent per year over the past 16 years, with active modification of its surface cover by geomorphic processes. The role of debris and local topography feedback has allowed the resilience of the glacier, leading to a marked difference between the current environmental equilibrium line altitude (envELA) and the effective ELA (effELA) of the glacier.
Article
Geography, Physical
Zhenzhen Yan, Yaolin Shi, Lili Kang, Xiangtao Fan
Summary: This study proposes a quantitative regional deformation model based on global positioning system (GPS) data to quantitatively analyze the morphological evolution of rivers in the Three Rivers Region. It finds that tectonic deformation phases significantly control regional landscape development and drainage features.
Article
Geography, Physical
Said Mukhtar Ahmad, Nitheshnirmal Sadhasivam, Mona Lisa, Luigi Lombardo, Mustafa Kemal Emil, Amira Zaki, Cees J. Van Westen, Islam Fadel, Hakan Tanyas
Summary: In this study, we investigated a large slow-moving landslide in Northern Pakistan, using Interferometric Synthetic Aperture Radar (InSAR) analysis. Our results showed that the crown of the landslide is moving faster than the surrounding regions, while the footslope experienced high deformations. We discussed the possible roles of meteorologic and anthropogenic factors in causing these deformations.
Article
Geography, Physical
Shuang Bian, Xibin Tan, Yiduo Liu, Suoya Fan, Junfeng Gong, Chao Zhou, Feng Shi, Michael A. Murphy
Summary: The Yarlung River's drainage divide is primarily moving north due to variations in precipitation across the Himalayas. The Gangdese drainage divide shows predominantly northward and southward migration, controlled by base-level rise and downstream influences. The presence of north-trending rifts separates the drainage divides into five zones, each with a distinct migration pattern.
Article
Geography, Physical
Joon-Young Park, Seok Yoon, Deuk-Hwan Lee, Seung-Rae Lee, Hwan-Hui Lim
Summary: This study developed a multiple-regression model to estimate site-specific average growth rates of debris flow events. The proposed model was validated through a case study and showed reasonable predictions of debris flow velocities and heights.
Article
Geography, Physical
Nicholas Reilly Mccarroll, Arnaud Temme
Summary: New geochronological data from hillslope boulder armor in the Flint Hills reveal the rates and timing of lateral retreat in the landscape. Surfaces of limestone boulders dating back to the Pleistocene era were found, and the ages of the hillslope armor increased with distance from the limestone bench. The estimated rate of lateral retreat in this landscape is 0.02 mm/yr.
Article
Geography, Physical
Xinbo Yao, Yuntao Tian
Summary: By studying the Longmenshan-Minshan drainage divide, we found that it has reached a dynamic steady state, indicating a balance between erosion and rock uplift. This study also reveals the process of formation and evolution of the divide and raises questions about the effectiveness of divide migration metrics.
Article
Geography, Physical
Junhui Yu, Pin Yan, Yanlin Wang, Guangjian Zhong, Changliang Chen
Summary: The seafloor mounds in the Chaoshan Depression of the South China Sea are identified as mud volcanoes, with fluids coming from underlying mud-fluid diapirs. The hydrocarbon gases feeding the mud volcanoes and diapirs are reasoned to originate from deep Mesozoic source rocks, indicating significant Mesozoic hydrocarbon potential in the Chaoshan Depression.
Article
Geography, Physical
Marius Huber, Luc Scholtes, Jerome Lave
Summary: This paper investigates the relationships between hillslope stability and fabric anisotropy of brittle rock materials and the implications for landscape shaping. It explores the different stability modes and movement characteristics of anisotropic materials, and demonstrates the significant control of material anisotropy on landscape shaping.
Article
Geography, Physical
Shubhra Sharma, Anil D. Shukla
Summary: The study investigates the relationship between glacial dynamics and lake sedimentation during the mid-Holocene climate variability in the Southern Zanskar ranges. It utilizes geomorphological disposition, elemental geochemistry, and optical chronology of relict lake sediment to reconstruct the pattern of minor glacier responses to climate variability. The results indicate six centennial to millennial-scale climatic phases, with warmer phases represented by decreased mineralogical fine grain flux and increased coarse grain flux. The study highlights the potential of relict lake sediment and para/peri-glacial landforms in understanding glacial dynamics and climate change during the Holocene.
Article
Geography, Physical
Jean-Francois Bernier, Sydney W. Meury, Patrick Lajeunesse
Summary: In this study, an approach combining various data and observation methods was proposed to improve the monitoring of landfast ice dynamics and its geomorphic impact on sedimentary systems. The results demonstrate the ability of the approach to accurately measure interannual variations in landfast ice and constrain geomorphic changes. Additionally, the study found a strong relationship between the severity of freezing seasons and the response of landfast ice to hydrometeorological events, with different geomorphic responses observed under different winter conditions.
Article
Geography, Physical
Heping Shu, Fanyu Zhang
Summary: This study investigates the relationship between susceptibility of soil-water hazards and human activities, geoheritage sites in the Loess Plateau, China. Landslide and gully erosion susceptibility were obtained using gradient boosting and support vector machines, and a hazard matrix was formed to couple landslide and gully erosion susceptibility. The study found different trends in the magnification times of soil-water hazards chain under different scenarios.
Article
Geography, Physical
Guangqiang Qian, Zhuanling Yang, Xuegang Xing, Zhibao Dong, Youyuan Guo
Summary: Granule ripples are aeolian landforms armored against erosion by coarse grains. This study investigates their seasonal morphological evolution and migration in the Sanlongsha Dune Field. The findings show that wind events, especially those exceeding the threshold velocities of coarse grains, significantly influence the morphodynamics of granule ripples. The study highlights the importance of considering the reptation and saltation of coarse grains in future research on granule ripples.