Article
Engineering, Civil
Bohua Sun
Summary: The research successfully transformed a complex-form ODE into Heun's ODE by introducing a variable transformation and proposed a real-form ODE system to overcome computational difficulties. A general code for numerical solution of the real-form ODE was written using Maple. Numerical studies showed sensitivity of deformation and stress response of an elastic torus to radius ratio.
THIN-WALLED STRUCTURES
(2021)
Article
Geosciences, Multidisciplinary
Aude Lurin, Odin Marc, Patrick Meunier, Sebastien Carretier
Summary: Channels are formed by erosive processes and impact the water and sediment dynamics of drainage basins. Identifying channel heads is difficult in steep landscapes, and the processes beneath them are not well understood. The CO(2)CHAIN method extracts channels from digital elevation models, and shows better performance than previous methods, providing new insights into the conditions for channel formation and competition between erosive processes.
JOURNAL OF GEOPHYSICAL RESEARCH-EARTH SURFACE
(2023)
Article
Chemistry, Analytical
Ivan Brkic, Mario Miler, Marko Sevrovic, Damir Medak
Summary: This paper proposes a framework for highly accurate and fully automatic determination of road attributes by integrating mobile Lidar point clouds with deep learning-based object detection. The accuracy of roadside severity-object and roadside severity-distance is obtained through experiments, and different roadside severity objects are classified.
Article
Meteorology & Atmospheric Sciences
Nevio Babic, Bianca Adler, Alexander Gohm, Norbert Kalthoff, Maren Haid, Manuela Lehner, Paul Ladstaetter, Mathias W. Rotach
Summary: Exchange of momentum and scalars in the mountain boundary layer is achieved through an interaction of meso-to-microscale motions, notably secondary circulations, with observational evidence lacking in curved mountain valleys. The importance of the relationship between the centrifugal and pressure gradient forces for the occurrence of cross-valley vortices was confirmed through detailed analysis of the lateral momentum budget and associated uncertainties.
QUARTERLY JOURNAL OF THE ROYAL METEOROLOGICAL SOCIETY
(2021)
Article
Geography, Physical
Dong Xu, Jingbin Liu, Yifan Liang, Xuanfan Lv, Juha Hyyppa
Summary: This paper proposes a single-shot global localization solution using LiDAR sensor data and HD maps, which is necessary in driverless vehicle and robotic technologies. The solution avoids nonconvergence problems and is more robust than existing methods. It consists of offline preprocessing and online global localization, and introduces the CSSC descriptor for place recognition and the SGICP algorithm for accurate location and pose estimation.
ISPRS JOURNAL OF PHOTOGRAMMETRY AND REMOTE SENSING
(2022)
Article
Mathematics
Daomin Cao, Jie Wan
Summary: In this article, we study the construction of traveling-rotating helical vortices in an infinite pipe. These vortices asymptotically tend to singular helical vortex filaments evolved by the binormal curvature flow. We also construct helical vortex solutions concentrated near several helical filaments with polygonal symmetry.
JOURNAL OF FUNCTIONAL ANALYSIS
(2023)
Article
Mechanics
B. H. Sun
Summary: This paper investigates the deformation and stress response of elastic tori with different shapes, suggesting that the analysis of tori should be done using the bending theory of shells. The study shows that the inner region of a torus is stiffer than the outer region due to the Gauss curvature.
INTERNATIONAL JOURNAL OF NON-LINEAR MECHANICS
(2021)
Article
Environmental Sciences
Joan Grau, Kang Liang, Jae Ogilvie, Paul Arp, Sheng Li, Bonnie Robertson, Fan-Rui Meng
Summary: The study used UAV and photogrammetry method to map boundaries of riparian zones, showing that high-resolution UAV-derived DEM had high agreement with field-measured riparian zones, making it a suitable approach in agricultural watersheds.
Article
Environmental Sciences
Nigel Van Nieuwenhuizen, John B. Lindsay, Ben DeVries
Summary: Fine-resolution LiDAR DEMs can accurately represent surface features such as road and railway embankments. A novel algorithm was proposed to identify embankments in LiDAR DEMs, achieving moderate to high accuracy. The technique showed good performance on test DEMs from southwest Ontario, Canada, with acceptable processing times for practical applications.
Article
Thermodynamics
Xueling Liu, Yuguo Fu, Jiansheng Wang, Huipeng Zhang, Jianxiao Zhu
Summary: This paper numerically investigates the flow and heat transfer characteristics in a sinusoidal rectangular channel. It is found that Dean vortex can be induced in the channel and its intensity varies with the channel curvature. The study further investigates the intensity of Dean vortex in sinusoidal channels with various cross-sectional ratios and the corresponding variation in heat transfer capacity. Additionally, the Dean vortex becomes unstable when the Reynolds number exceeds a critical value.
INTERNATIONAL JOURNAL OF THERMAL SCIENCES
(2022)
Article
Geosciences, Multidisciplinary
Zachary S. Brecheisen, Daniel deB Richter
Summary: Gully mapping techniques can successfully identify gullies, but the practices for estimating gully volumes need further development. Gully gap-interpolation for volume estimation often does not consider landscape microtopography, leading to potential underestimation or overestimation of gully volumes.
Article
Astronomy & Astrophysics
G. R. Boroun
Summary: In this study, predictions are presented for the top-pair production cross section in electron-proton collisions at the future circular collider hadron-electron and the large hadron electron collider, using perturbative quantum chromodynamics at the leading order and next-to-leading order approximations. The results provide important insights for future collider experiments and the improvement of phenomenological models for cosmic ray cascades.
Article
Thermodynamics
Yohei Kubo, Sayaka Yamada, Hideki Murakawa, Hitoshi Asano
Summary: Frictional pressure drop and flow patterns of vertically upward boiling flows in semi-circular mini-channels were experimentally investigated using R-245fa as the working fluid. It was found that the gas Weber number increased with increasing mass flux and decreasing hydraulic diameter, and nucleate boiling leading to strong fluctuation of the gas-liquid interface was observed in the 0.55 mm channel.
APPLIED THERMAL ENGINEERING
(2021)
Article
Thermodynamics
Yohei Kubo, Sayaka Yamada, Hideki Murakawa, Hitoshi Asano
Summary: This study experimentally investigated the boiling heat transfer characteristics of vertically upward flows in small-diameter semicircular channels heated with hot water. The influences of channel cross-section and thermal diffusivity of a heat transfer wall on heat transfer characteristics were characterized. The results showed that the heat transfer coefficient increased with the outlet quality for high mass flux, and a new correlation equation was derived to express the heat transfer coefficient for semicircular minichannels.
APPLIED THERMAL ENGINEERING
(2023)
Article
Environmental Sciences
Andrej Novak, Kristof Ostir
Summary: Alpine topography is shaped by complex geomorphological processes, with Quaternary sedimentary bodies being the youngest and most diverse landforms. The use of digital elevation models and visualization techniques such as analytical hillshading can aid in identifying and studying Quaternary sedimentary bodies and processes in alpine landscapes.
Article
Engineering, Civil
Matthew Bilskie, Scott C. Hagen, Stephen C. Medeiros
COASTAL ENGINEERING
(2020)
Article
Environmental Sciences
Subrina Tahsin, Stephen C. Medeiros, Arvind Singh
Article
Engineering, Civil
Daljit Sandhu, Arvind Singh, Dingbao Wang
JOURNAL OF HYDROLOGY
(2020)
Article
Environmental Sciences
Lili Yao, Dominic A. Libera, Marwan Kheimi, A. Sankarasubramanian, Dingbao Wang
WATER RESOURCES RESEARCH
(2020)
Article
Environmental Sciences
Subrina Tahsin, Stephen C. Medeiros, Arvind Singh
Summary: This study proposes a method to generate synthetic NDVI images using a virtual constellation, which effectively mitigates the impact of cloud contamination on vegetation monitoring data, showing high accuracy and reliability.
Article
Environmental Sciences
Lili Yao, A. Sankarasubramanian, Dingbao Wang
Summary: This study evaluates the impacts of climate and landscape characteristics on long-term baseflow using various indices and functions. The results show that storage capacity has a significant impact on baseflow indices, with different sensitivities in arid and humid regions, while the shape parameter plays a role in different ways in different regions.
WATER RESOURCES RESEARCH
(2021)
Article
Environmental Sciences
Amir Mazrooei, Meredith Reitz, Dingbao Wang, A. Sankarasubramanian
Summary: This study investigates the impacts of urbanization on evapotranspiration (ET) fluxes across different landscapes and timescales. The observed patterns show that the difference in ET between urban and non-urban areas is influenced by local hydroclimate, with arid regions experiencing increased ET and humid regions showing decreased ET. Cities in cold climates tend to evaporate more during winter due to increased energy availability from human activities. Urban areas in arid regions have increased ET due to water withdrawals and irrigation during drought conditions. These findings can help planners in integrating environmental conditions into urban landscape design and management.
Article
Environmental Sciences
Lili Yao, Dingbao Wang
Summary: This article explores the impact of spatial variability of available water for evaporation on the Budyko equation and suggests that precipitation partitioning and energy partitioning follow the same functional form in the hydrological cycle. The study provides insights into the influence of spatial variability of available water on mean annual evaporation.
WATER RESOURCES RESEARCH
(2022)
Article
Meteorology & Atmospheric Sciences
Lili Yao, Dingbao Wang
Summary: This study investigates the connection between TOPMODEL and VIC model through virtual experiments, focusing on water table and storage. The results show that the land surface can be a proxy for the water table when it is shallow, and the climatic lower limit can act as a proxy for the water table when it is deep, with storage being approximately spatially uniform over the unsaturated area.
JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES
(2022)
Article
Environmental Sciences
Xi Chen, Dingbao Wang, Murugesu Sivapalan
Summary: This study investigates the climatic controls on the energy partitioning of net radiation into sensible heat and latent heat at the watershed scale. The research finds that the relationship between evaporative fraction and the aridity index follows a trend similar to the Budyko curve. Mediating factors, including equilibrium root zone soil moisture and land-air temperature difference, are identified as connecting energy partitioning with climate. The study provides important insights into the complex behavior of watershed systems and has implications for improving modeling performance.
WATER RESOURCES RESEARCH
(2022)
Article
Environmental Sciences
Yu Zhang, Lili Yao, Jeffrey S. Geurink, Kshitij Parajuli, Dingbao Wang
Summary: This study proposes a three-stage precipitation partitioning framework to investigate the climate controls on mean annual groundwater evapotranspiration (GWET) in west-central Florida. The Integrated Hydrologic Model is used to simulate daily GWET, total evapotranspiration (ET), groundwater recharge, base flow, and total runoff. The results show that the ratios of GWET to various water variables decrease exponentially with watershed aridity index (WAI). The contribution of GWET to the ratio between total ET and available water or watershed wetting decreases with WAI in both one-stage and two-stage precipitation partitioning frameworks. Climate variability at different temporal scales affects GWET differently, with intra-monthly variability having the highest impact. Finally, the percentage of forest and wetland and impervious land cover contribute to the ratio of GWET to available water for GWET.
WATER RESOURCES RESEARCH
(2023)
Article
Ecology
David J. Cannon, Kelly M. Kibler, Jyotismita Taye, Stephen C. Medeiros
Summary: The structural complexity of oyster reef canopy is important in promoting biodiversity, balancing sediment budget, and modulating hydrodynamics in estuarine systems. This study used a novel laser-scan approach to measure the surface of intact and restored reefs, providing estimates of hydrodynamically relevant roughness characteristics. The results provide spatially explicit surface roughness characterizations for healthy oyster reefs, which have applications in restoration science and nature-based feature design.
RESTORATION ECOLOGY
(2023)
Article
Engineering, Electrical & Electronic
Stephen C. Medeiros, Joelle S. Bobinsky, Khalid Abdelwahab
Summary: This article investigates the necessity of using local ground truth data to adjust lidar-derived DEMs for salt marshes. The study finds that using local data improves the accuracy of the DEMs and identifies DEM elevation as the most important predictor.
IEEE JOURNAL OF SELECTED TOPICS IN APPLIED EARTH OBSERVATIONS AND REMOTE SENSING
(2022)
Article
Geosciences, Multidisciplinary
Sevil Ranjbar, Arvind Singh, Dingbao Wang
GEOPHYSICAL RESEARCH LETTERS
(2020)
Article
Engineering, Electrical & Electronic
Karim Alizad, Stephen C. Medeiros, Madeline R. Foster-Martinez, Scott C. Hagen
IEEE JOURNAL OF SELECTED TOPICS IN APPLIED EARTH OBSERVATIONS AND REMOTE SENSING
(2020)