Article
Environmental Sciences
Dake Chen, Jinhai Zheng, Chi Zhang, Dawei Guan, Yuan Li, Yigang Wang
Summary: The study investigates the erosion threshold of sand-mud mixtures by analyzing the momentum balance of particles in the bed surface, and develops a formula for the critical shear stress that also applies to pure sand and mud. The variation in critical shear stress over mud content is attributed to the varying dry bulk density of the mud component in the mixture. The developed formula accurately predicts the critical shear stress of sand-mud mixtures and pure mud during consolidation, offering a convenient application by relating critical shear stress to mud content and dry bulk density.
FRONTIERS IN MARINE SCIENCE
(2021)
Article
Soil Science
Sanghyun Lee, Maria L. Chu, Jorge A. Guzman, Dennis C. Flanagan
Summary: A non-linear regression model was developed to estimate temporal adjustments of K-i, K-r, and tau(c) considering different crops and management practices. The predicted adjustments showed good agreements with sample data and WEPP simulations, indicating their potential use in soil erosion models.
SOIL & TILLAGE RESEARCH
(2022)
Article
Multidisciplinary Sciences
Xingyu Yuan, Fei Ye, Wenxi Fu, Lina Wen
Summary: The critical shear stress is a key indicator for soil erosion. This study proposes an equation based on the force equilibrium of a single particle to estimate the critical shear stress for incipient particle motion of a cohesive soil slope. The influence of different parameters on the critical shear stress is analyzed through validation and comparison of different formulas.
SCIENTIFIC REPORTS
(2022)
Article
Environmental Sciences
Dandan Li, Xiaoyan Chen, Zhen Han, Xiaojie Gu, Yanhai Li
Summary: The hydrological conditions near the soil surface are important factors affecting soil erosion, and this study compares the soil erodibility and critical shear stress of saturated and unsaturated purple soil slopes. The results show that the saturated purple soil is more susceptible to erosion, and the numerical method tends to overestimate the soil erodibility.
INTERNATIONAL SOIL AND WATER CONSERVATION RESEARCH
(2022)
Article
Environmental Sciences
Ren Geng, Qiu Jin, Shaohua Lei, Hongyuan Liu, Bin Lu, Meixiang Xie
Summary: This study evaluates the reliability of different methods for determining the critical shear stress of rill erosion and explores its relationship with erodibility and influencing factors. The results show differences in the critical shear stress obtained from different methods and no significant relationship with erodibility. This has important implications for understanding the mechanism of rill erosion.
Article
Engineering, Civil
Misagh Parhizkar, Mahmood Shabanpour, Manuel Esteban Lucas-Borja, Demetrio Antonio Zema
Summary: The study found that soil with sediment sizes greater than 1 mm has higher erosion capacity, which increases primarily with soil slope and secondarily with water depth. The unit stream power was identified as the best predictor of rill detachment capacity, with high accuracy in power equations and linear regression models. Sediments larger than 1 mm were found to have lower resistance to rill erosion compared to finer fractions.
JOURNAL OF HYDROLOGY
(2021)
Article
Environmental Sciences
Jun Young Seo, Sun Min Choi, Ho Kyung Ha
Summary: The study found that Spartina vegetation in intertidal flats can both trap suspended sediments to promote deposition and protect against bed erosion by increasing sediment erodibility. However, Spartina also hinders the outflow of eroded mass, leading to increased vulnerability of upper sediment layers to erosion.
SCIENCE OF THE TOTAL ENVIRONMENT
(2021)
Article
Marine & Freshwater Biology
J. C. de Smit, M. G. Kleinhans, T. Gerkema, T. J. Bouma
Summary: The study discusses the importance of the erosion threshold of cohesive sediments in tidal flats and the need for rapid methods to quantify the critical bottom shear stress. The use of the mobile Oscillatory-Channel Resuspension flume, OsCaR, allows for accurate measurement of wave-generated shear stress on sediment cores and captures the main benthic processes effectively.
ESTUARINE COASTAL AND SHELF SCIENCE
(2021)
Article
Geosciences, Multidisciplinary
Min Li, Qianjin Liu, Hanyu Zhang, Robert R. Wells, Lizhi Wang, Jibiao Geng
Summary: Antecedent soil moisture has different effects on critical shear stress and rill erodibility depending on soil texture. As antecedent soil moisture increases, rill erodibility first increases and then decreases for fine-grained soil, while it exhibits a decreasing pattern for coarse-grained soil. Conversely, critical shear stress decreases first and then increases for fine-grained soil, but decreases after a slight increase for coarse-grained soil.
Article
Environmental Sciences
Rouhallah Fatahi Nafchi, Hossein Samadi-Boroujeni, Hamid Raeisi Vanani, Kaveh Ostad-Ali-Askari, Milad Khastar Brojeni
Summary: This research focuses on understanding the dynamic behavior of fine-sticky sediments in the development and maintenance of reservoirs and water transfer networks for the Karkheh dam reservoir management. The results show that the concentration of eroded sediments is a function of time for the consolidation of reservoir sediment, and the duration of consolidation time is an effective factor on critical erosion shear stress. Erosion rate suggests an inverse relationship with the life of the settled sediments, indicating that the best flow shear stress for sediment removal from the Karkheh dam reservoir should be greater than 0.31 N/m(2).
ENVIRONMENTAL EARTH SCIENCES
(2021)
Article
Engineering, Civil
Misagh Parhizkar, Mahmood Shabanpour, Manuel Esteban Lucas-Borja, Demetrio Antonio Zema
Summary: Deforestation leads to soil erosion, while hydromulching has been found to be effective in controlling erosion. This study evaluated the impact of hydromulching on rill detachment capacity and erodibility in deforested areas, showing that hydromulching significantly reduces rill erosion in treated soils.
JOURNAL OF HYDROLOGY
(2021)
Article
Environmental Sciences
Dake Chen, Jinhai Zheng, Chi Zhang, Dawei Guan, Yuan Li, Huiming Huang
Summary: This study investigates the incipient motion condition of cohesive sediment considering particle aggregation using fractal theory and van der Waals force. A formula for the critical shear stress for surface erosion of cohesive sediments composed of fractal aggregates is developed, and the contribution rate of aggregate weight to erosion threshold is quantified.
FRONTIERS IN MARINE SCIENCE
(2022)
Article
Oceanography
Jianwei Niu, Jieshuo Xie, Shicheng Lin, Pengzhi Lin, Fei Gao, Jian Zhang, Shuqun Cai
Summary: Data from a 5-month observation of the Yellow River Delta shows that storm wave-related flows are intermittently turbulent in nature. Wave-induced liquefaction leads to changes in bed erodibility and increased sediment entrainment, resulting in the formation of fluid mud layer during winter wind events. The thickness of the fluid mud layer significantly increases with wave height and decreases with water depth. Enhanced sediment erosion in liquefaction zones can cause the degradation of the Yellow River Delta.
JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS
(2023)
Article
Oceanography
Jianwei Niu, Jieshuo Xie, Shicheng Lin, Pengzhi Lin, Fei Gao, Jian Zhang, Shuqun Cai
Summary: Data from a field observation of the Yellow River Delta showed that wave-induced liquefaction events during winter winds lead to the formation of a fluid mud layer (FML). The thickness of the FML is influenced by wave height and water depth. Sediment erosion rate is not only affected by wave-induced bottom shear stress, but also by excess pore pressure buildup and sediment liquefaction in liquefaction zones. Erosion rate in liquefaction zones can be 5-10 times higher than in non-liquefaction conditions.
JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS
(2023)
Article
Marine & Freshwater Biology
B. R. Evans, H. Brooks, C. Chirol, M. K. Kirkham, I Moller, K. Royse, K. Spencer, T. Spencer
Summary: This study investigated the relationship between the presence of different saltmarsh plants and the mechanical properties of the underlying substrate. The findings showed that vegetation can enhance sediment shear strengths, but the effect varies depending on the sediment type.
ESTUARINE COASTAL AND SHELF SCIENCE
(2022)