Results 31 to 40 of about 424 (174)

Estimation of scour depth at a single non-submerged vertical spur dike under unidirectional currents

Water Science and Engineering
Accurately estimating equilibrium scour depths at spur dikes remains challenging due to the complexity of scour around these structures. Scour critically threatens spur dikes built in river estuaries for enhancing navigability and preventing bank erosion.
HtayHtay Aung, Min-xi Zhang, Giuseppe Oliveto, Beniamino Onorati, Guo-liang Yu   +4 more
doaj   +1 more source

Influence Mechanisms of Spatial Optimization of the “Terraced Fields‐Gully Land Reclamation Project (GLRP)” Cascades on Erosion‐Transportation Processes in Watershed in the Loess Hilly‐Gully Region of China

Land Degradation &Development, EarlyView.
ABSTRACT Terraced fields and the Gully Land Reclamation Project (GLRP) are important soil and water conservation measures, widely constructed in China's Loess Plateau and other ecologically fragile areas in the world. However, under large‐scale governance scenarios, the impacts of the “terraced fields‐GLRP” cascade system on water and sediment ...
Zhe Gao, Xiaoqian Xu, Gen'guang Zhang, Hongke Hao, Shaobo Long, Wenzheng Li, Chuan Yang, Xinhua Zhang, Lei Liu, Jian'en Gao   +9 more
wiley   +1 more source

Local scour around complex pier groups and combined piles at semi-integral bridge

Journal of Hydrology and Hydromechanics, 2014
This research presents an experimental study on the scouring mechanism at semi-integral bridge piers. Based on laboratory experiments, this study focuses on the relationship between scour depth in complex pier groups and combined piles bridge and various
Akib Shatirah, Jahangirzadeh Afshin, Basser Hossein   +2 more
doaj   +1 more source

Flow and Scour Analysis Around Monopole of Fixed Offshore Platform Using Method that Couples Computational Fluid Dynamics and Discrete Element Method [PDF]

한국해양공학회지, 2019
When an offshore foundation is exposed to waves and currents, local scour could develop around a pile and even lead to structural failure. Therefore, understanding and predicting the scour due to sediment transport around foundations are important in the
Seongjin Song, Wooyoung Jeon, Sunho Park
doaj   +1 more source

Evaluation of methods for the analysis of oxygen and carbon dioxide in water, sediment, litter, and soil

Limnology and Oceanography: Methods, EarlyView.
Abstract Choosing an appropriate analyzer to measure concentrations of oxygen (O2) and carbon dioxide (CO2) during biogeochemical cycling studies can be difficult, considering the range of options available. While several studies examine the abilities of specific analyzers, comparison of multiple analyzers and environmental sample types is lacking.
Elizabeth Jakobsson, Konstantinos‐Marios Vaziourakis, Lars Tranvik   +2 more
wiley   +1 more source

Effect of trapezoidal collars as a scour countermeasure around wing-wall abutments

Water Science and Engineering, 2018
Local scour around bridge abutments is a widespread problem that can result in structural failure. Collars can be used as a countermeasure to reduce the scour depth.
Payam Khosravinia, Amir Malekpour, Ali Hosseinzadehdalir, Davod Farsadizadeh   +3 more
doaj   +1 more source

Integrating and assessing metacommunity drivers of ecosystem function and resilience in benthic algal systems

Oikos, EarlyView.
Understanding the scales and mechanisms by which species composition interacts with ecosystem functions is critical for forecasting the effects of environmental perturbations on ecosystem services. However, the linkages between what regulates the ecosystem functions of dispersal‐capable networks of communities (metacommunities) and what regulates a ...
Thomas P. Shannon, Evelyn E. Gaiser
wiley   +1 more source

Scour due to turbulent wall jets downstream of low-/high-head hydraulic structures

Cogent Engineering, 2016
To overcome over-prediction of the scour depths by existing methods, a mathematical model is developed based on a work transfer theory. This model predicts the equilibrium scour hole’s depth and length due to two-dimensional turbulent wall jets ...
Youssef I. Hafez
doaj   +1 more source

Equilibrium scour depths around piles in noncohesive sediments under currents and waves

Coastal Engineering, 2011
Abstract A universal formula for the estimation of equilibrium scour depth around a single cylindrical pile under the action of steady currents, tidal and short waves is presented. Following a dimensional analysis, the controlling parameters of scour was found to be the Keulegan–Carpenter number and the ratio between the flow velocity and the ...
Zanke, Ulrich C. E., Hsu, Tai-Wen, Roland, Aron, Link, Oscar, Diab, Reda   +4 more
openaire   +3 more sources

Evaluating Testability of Permafrost Models Through Physical and Thermal Testing in Complex Mountain Terrain, Yukon, Canada

Permafrost and Periglacial Processes, EarlyView.
ABSTRACT Due to its subsurface nature, permafrost cannot be directly observed with the naked eye or optical remote sensing. Consequently, accurately describing its distribution and thermal state is challenging. This is especially true in vast, remote environments, where obtaining comprehensive field data is demanding or improbable.
Ria Nicholson, Philip P. Bonnaventure, Nick C. Noad, Madeleine C. Garibaldi, Rabecca Thiessen, Will Kochtitzky   +5 more
wiley   +1 more source