Article
Multidisciplinary Sciences
Amirkhosro Kazemi, Luciano Castillo, Oscar M. Curet
Summary: Mangrove swamps are highly productive ecosystems that play a key role in mitigating erosion in coastal regions. Studies show that understanding the interactions between root porosity, water flows, and sediment transport is crucial for predicting coastal morphological evolution in the face of global warming and sea-level rise. The porosity of mangrove roots influences sediment transport critical velocity, with an optimum porosity reducing erosion and increasing the critical velocity for sediment transport.
SCIENTIFIC REPORTS
(2021)
Article
Construction & Building Technology
Jianxiang Guo, Xiaobin Wei
Summary: This paper presents a new method of preparing soil samples for fall cone tests to determine consistency limits, which combines the sedimentation method and consolidation test. The results show that the specimens prepared by this method can reach low water content and obtain plastic limit directly. Additionally, the un saturated specimens have larger undrained shear strength than the saturated specimens, which explains the difference in consistency limits obtained from different sample preparation methods.
ADVANCES IN CIVIL ENGINEERING
(2022)
Article
Engineering, Geological
Muawia Dafalla, Abdullah Shaker, Abduallah Almajed, Kehinde Lemboye
Summary: This study investigates the use of a dynamic cone penetrometer as a quick tool to assess the shear strength and density of sand-clay cover liners. It is found that a light-weight dynamic probe can provide reliable shear strength measurements for bentonite sand mixture materials. The study also establishes a bilinear relationship between cone penetration and moisture content, and verifies the influence of dry density on penetration through laboratory fall cone tests.
SOILS AND FOUNDATIONS
(2023)
Article
Engineering, Geological
Gerd Gudehus
Summary: This passage provides a detailed description of the principle of effective stress and its application in soil and rock, focusing on the explanation of shear strength in water-saturated soil and over-consolidated clay, as well as the neutrality related to pore water pressure pw. It also mentions the interaction between solid fabric and pore water determined by the pw-neutrality of the solid mineral, while discussing the controversial nature of numerical models due to fractal features.
Article
Engineering, Geological
Jashod Roy, Kyle M. Rollins, Adda Athanasopoulos-Zekkos, McKay Harper, Nicolas Linton, Michelle Basham, William Greenwood, Dimitrios Zekkos
Summary: The Chinese Dynamic Cone Penetration (DPT) test provides an accurate and economical alternative for evaluating liquefaction potential in gravelly soils, with results consistent with conventional SPT tests.
SOIL DYNAMICS AND EARTHQUAKE ENGINEERING
(2022)
Article
Engineering, Marine
Jiayi Shen, Xinyi Wang, Qian Chen, Zhaoyi Ye, Qiaoling Gao, Jiawang Chen
Summary: The laboratory miniature vane shear test (MVST) is widely used to measure the undrained shear strength of marine sediments, but transferring soil samples from the seabed to the laboratory can reduce soil strength by releasing in situ confining stress. In this study, a Coupled Eulerian-Lagrangian (CEL) approach in ABAQUS is used to model the three-dimensional standard and miniature vane shear tests, and estimate the undrained shear strength of sensitive clay under different stress conditions. A linear strength model is proposed based on the numerical simulation results, which considers both the effects of confining stress and eliminates the size effects caused by vane blades of MVST. This model can be used to estimate the undrained shear strength of sensitive clay under shallow seabed surfaces.
JOURNAL OF MARINE SCIENCE AND ENGINEERING
(2023)
Article
Engineering, Civil
Jianming Li, Li Li, Zhigang Wang, Changwei Zhang, Yifeng Wang, Wenlong Wang, Guanhua Zhang, Jinquan Huang, Hao Li, Xingdong Lv, Jian Pu, Jigen Liu
Summary: The study found that grass recovery can significantly reduce soil loss rate on spoil heaps, with no significant difference in erosion reduction efficiency between different grass types. The contribution rate of roots to soil loss reduction varied under different rainfall intensities.
JOURNAL OF HYDROLOGY
(2021)
Article
Plant Sciences
Martin Heidelman, Dervis Can Vural
Summary: The vertical protrusions of coastal and wetland trees, such as the 'knee roots' of baldcypress trees, create an elevated sediment patch downstream, serving as flood-protected breeding grounds for seedlings. Computational simulations reveal an optimal vertical root spacing dependent on root thickness, and cooperative effects between adjacent root patches. Varying the vertical root spacing allows estimation of a maximal vegetation density with a beneficial geomorphological response.
FRONTIERS IN PLANT SCIENCE
(2023)
Article
Engineering, Civil
Xiang Wang, Carlo Gualtieri, Wenxin Huai
Summary: The impact of aquatic vegetation on weak bed-load transport rates in riverbeds was investigated through laboratory experiments. It was observed that the transport rate increased with an increase in energy slope and a decrease in vegetation density. The traditional method of calculating bed shear stress was unable to predict the measured transport rate, but a new method considering grain shear stress provided a reasonable prediction. The proposed models were found to be more accurate than existing literature models, improving understanding of bed-load transport in vegetated flows.
JOURNAL OF HYDROLOGY
(2023)
Article
Engineering, Multidisciplinary
Geunwoo Park, Jong-Sub Lee, Namsun Kim, Dongsoo Lee, Sang Yeob Kim
Summary: The effects of hammer weight and drop height on compression stress, transferred energy, and strength index in loose layer were evaluated in this study using an instrumented dynamic cone penetrometer (IDCP). The dynamic responses and penetration index from the IDCP were obtained with different hammer weights and drop heights. The results showed that the compression stress and transferred energy varied at the rod head and cone tip with respect to the hammer weight and drop height. Furthermore, the IDCPI also varied according to the hammer weight and drop height, even with identical potential energy.
Article
Multidisciplinary Sciences
Sang Hyun Lee, Eleonora Secchi, Peter K. Kang
Summary: Bioaggregates are dense porous materials consisting of microorganisms, organic and inorganic matters, and water, which are commonly found in natural and engineered porous media and often cause clogging. The formation mechanism of bioaggregates in porous media systems is largely unknown, but this study shows that it is driven by the interplay of biomass viscoelasticity and hydrodynamic conditions at pore throats. The study also reveals that shear stress triggers morphological changes in bioaggregates, leading to disruptions in flow.
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
(2023)
Article
Construction & Building Technology
Leo Demont, Romain Mesnil, Nicolas Ducoulombier, Jean-Francois Caron
Summary: The control of mortar rheology is crucial in 3D printing concrete, especially for two-component processes. We propose an original inline test using a pocket shear vane tester, which can accurately measure the structuration of printed mortars and demonstrate the quality and importance of inline measurements.
CONSTRUCTION AND BUILDING MATERIALS
(2023)
Article
Multidisciplinary Sciences
Kamil Kayabali, Nihan P. Yilmaz, Mehmet C. Balci, Deniz Yilmaz
Summary: Identifying strength parameters under drained conditions is crucial for monitoring and evaluating long-term soil deformations caused by structures built on or in soils. This study explores the possibility of using a vane shear test at low rotation speeds to identify the effective internal friction angle of remolded soils. The results indicate that the vane shear test can be used to predict phi', but the predictions may be influenced by certain factors.
ARABIAN JOURNAL FOR SCIENCE AND ENGINEERING
(2023)
Article
Engineering, Geological
Jiazheng Zhong, Shuying Wang, Tongming Qu
Summary: This study investigated the effect of shear rates on the shear strength of sand-foam mixtures. The results showed that under high pressure and low foam injection ratio, increasing shear rates decreased the peak strength of sand-foam mixtures, while the residual strength was not significantly affected by shear rates. Moreover, the peak and residual strengths were approximately linear with vertical effective stress.
JOURNAL OF ROCK MECHANICS AND GEOTECHNICAL ENGINEERING
(2023)
Article
Engineering, Geological
Nina Stark, Nico Parasie, Joek Peuchen
Summary: This study investigates the derivation of geotechnical properties from piezocone FFP measurements in deepwater geotechnical site investigations. The strain rate normalization methods were tested and the results showed that the strain rate effects were small for FFP cone resistance. The derived undrained shear strength matched well with the results from CPT, and the two soil behavior classifications also showed acceptable agreement between FFP and CPT results.
CANADIAN GEOTECHNICAL JOURNAL
(2022)
Article
Marine & Freshwater Biology
Angelina M. Freeman, Felix Jose, Harry H. Roberts, Gregory W. Stone
ESTUARINE COASTAL AND SHELF SCIENCE
(2015)
Article
Engineering, Environmental
Eurico J. D'Sa, Edward B. Overton, Steven E. Lohrenz, Kanchan Maiti, R. Eugene Turner, Angelina Freeman
ENVIRONMENTAL SCIENCE & TECHNOLOGY
(2016)
Article
Ecology
Navid H. Jafari, Brian D. Harris, Jack A. Cadigan, Qin Chen
ECOLOGICAL ENGINEERING
(2019)
Review
Marine & Freshwater Biology
Kehui Xu, Samuel J. Bentley, John W. Day, Angelina M. Freeman
ESTUARINE COASTAL AND SHELF SCIENCE
(2019)
Article
Marine & Freshwater Biology
R. R. Twilley, J. W. Day, A. E. Bevington, E. Castaiieda-Moya, A. Christensen, G. Holm, L. R. Heffner, R. Lane, A. McCall, A. Aarons, S. Li, A. Freeman, A. S. Rovai
ESTUARINE COASTAL AND SHELF SCIENCE
(2019)
Article
Engineering, Geological
Navid H. Jafari, Jack A. Cadigan, Timothy D. Stark, Mark L. Woodward
JOURNAL OF GEOTECHNICAL AND GEOENVIRONMENTAL ENGINEERING
(2019)
Editorial Material
Marine & Freshwater Biology
James W. Pahl, Angelina M. Freeman, Richard C. Raynie, John Day
ESTUARINE COASTAL AND SHELF SCIENCE
(2020)
Article
Multidisciplinary Sciences
Brian D. Harris, Donnie J. Day, Jack A. Cadigan, Navid H. Jafari, Susan E. Bailey, Zachary J. Tyler
Summary: Coastal wetlands are experiencing accelerated rates of fragmentation and degradation, with wetland restoration projects requiring more monitoring tools and effective data analysis. The use of cone penetrometer (CPT) strength measurements can serve as a surrogate to monitor wetland vegetation trajectories.
Article
Engineering, Geological
Ye-Hong Chen, Frank T-C Tsai, Jack A. Cadigan, Navid H. Jafari, Tzenge-Huey Shih
Summary: This study compares relief well performance at Profit Island levee using a 3D model and blanket theory, finding that the 3D model shows all 84 relief wells maintaining a safety factor above 1.5 during the 1997 flood peak, despite some wells having negligible discharge rates. The study suggests that 3D seepage modeling is a reliable and precise tool.
JOURNAL OF GEOTECHNICAL AND GEOENVIRONMENTAL ENGINEERING
(2021)
Review
Environmental Sciences
Angelina M. Freeman, James W. Pahl, Eric D. White, Summer Langlois, David C. Lindquist, Richard C. Raynie, Leigh Anne Sharp
Summary: Louisiana has lost a significant amount of coastal land since 1932, prompting a large-scale effort to restore and reduce flood risk in the region. Utilizing science-based planning processes, the state aims to address uncertainties and effectively implement restoration projects to sustain coastal environments and communities.
Article
Geosciences, Multidisciplinary
Jack A. Cadigan, Navid H. Jafari, Camille L. Stagg, Claudia Laurenzano, Brian D. Harris, Amina E. Meselhe, Jason Dugas, Brady Couvillion
Summary: This study emphasizes the important contribution of belowground vegetation biomass to the stability of coastal wetlands and identifies the loss of vegetation as a critical driver of wetland collapse. Field investigations reveal a significant decrease in shear strength of the surficial soils following wetland collapse, resulting from the loss of vegetation and soil compaction. The recovery from wetland collapse may be difficult due to additional sea-level rise, deep subsidence, and reduced sedimentation.
Article
Geography, Physical
Jack A. Cadigan, Navid H. Jafari, Nan Wang, Qin Chen, Ling Zhu, Brian D. Harris, Yan Ding
Summary: Mechanisms controlling marsh edge erosion include wind-generated waves, vegetation productivity, land use and land change, and sediment geotechnical properties. Existing models focus on wave energy and empirical constants, lacking high-frequency monitoring. This study developed a camera and erosion pin monitoring system, and observed that long-term erosion rates align with previously reported relationships between wave power and erosion while high-frequency measurements reveal short-term erosion events. The findings highlight the importance of high-frequency monitoring for accurate predictions of marsh edge erosion. Rating: 8/10
EARTH SURFACE PROCESSES AND LANDFORMS
(2023)
Proceedings Paper
Engineering, Civil
Brian D. Harris, Jack Cadigan, Donnie Day, Navid Jafari
GEOTECHNICAL EARTHQUAKE ENGINEERING AND SPECIAL TOPICS (GEO-CONGRESS 2020)
(2020)