Results 61 to 70 of about 23,458 (259)

Varied motivations for secondary forest reclearing among landholders make forest persistence challenging

People and Nature, EarlyView.
Abstract Remote sensing studies show that ephemeral forest regeneration is widespread in the tropics, limiting the climate and biodiversity benefits from net increases in forest cover. Socioeconomic, biophysical and landscape variables can help explain the spatial distribution of reforestation reversals.
Francis H. Joyce
wiley   +1 more source

Numerical investigation of scour behavior around complex piers under flood conditions

Frontiers in Built Environment
IntroductionLocal scour at bridge piers is a primary cause resulting bridge failure, a risk that is significantly exacerbated under extreme hydrodynamic events such as floods.MethodsThis study presents a numerical investigation of the scour behavior ...
Qiang Qin, Liangliang Shi, Yufei Li, Yujie Li, Haozhou Qin, Gang Ren, Zhiying Yang   +6 more
doaj   +1 more source

Turbulent flow structures and scour hole characteristics around circular bridge piers over non-uniform sand bed channels with downward seepage [PDF]

, 2019
Bridges play an important role in the transportation of goods and people across rivers. In civil engineering, one of the most important issues is to protect bridge piers from collapse.
Bimlesh Kumar, Paola Gualtieri, Rutuja Chavan   +2 more
core   +1 more source

Turbulent snow transport and accumulation: New reduced‐order models and diagnostics

Quarterly Journal of the Royal Meteorological Society, EarlyView.
Our new reduced‐order models of snow particle transport provide high‐fidelity calculations of snow accumulation in turbulent flows at significantly reduced computational costs. Additional accumulation diagnostics from the reduced‐order model predict complex patterns of particle concentration in turbulent boundary layers via coherent flow structures in ...
Nikolas O. Aksamit, Alex P. Encinas‐Bartos, Holt Hancock, Alexander Prokop   +3 more
wiley   +1 more source

Study on time development of horse-shoe vortex diameter and shear stress at bridge pier [PDF]

مهندسی منابع آب, 2020
Horse-shoe vortex at the bridge pier nose is a final result of reverse pressure gradient at the upstream side of pier and river surface. From literature review different ideas about the formation and initiation of horse-shoe vortex at the bridge pier can
Mojtaba Karimaei Tabarestani
doaj  

A review of bridge scour monitoring techniques and developments in vibration based scour monitoring for bridge foundations

Advances in Bridge Engineering, 2023
Scour is the gradual erosion of the sediment around a bridge foundation and is one of the leading causes of bridge failure. This erosion is caused by turbulence and sediment transport mechanisms and worsens during high-water flow, such as flooding.
Alan Kazemian, Tien Yee, Metin Oguzmert, Mahyar Amirgholy, Jidong Yang, Dale Goff   +5 more
doaj   +1 more source

Modelling the effect of sediment coarseness on local scour at wide bridge piers [PDF]

, 2017
Experimental data from a physical model of scouring around a cylindrical wide pier embedded in two types of uniform sediment beds are presented. The effects of sediment sizes and various pier widths on scour development and equilibrium scour depth of ...
Ahmad, Nordila, Ali, Faisal, Melville, Bruce W., Mohammed, Thamer Ahmed, Yusuf, Badronnisa   +4 more
core  

Strategies for Assessing Post‐Wildfire Geomorphic Resilience in Semiarid Rivers

River Research and Applications, EarlyView.
ABSTRACT We review and summarize diverse components of a catchment that can be monitored after wildfire to assess the geomorphic resilience of the river corridor in semiarid regions. We distinguish upland portions of river catchments from river corridors.
Ellen Wohl, Shayla Triantafillou, Alex Thornton‐Dunwoody, Connor Mertz, Katie Larkin, William Keenan, Steven Griffin, Dylan Davis, Lindsey Blehm   +8 more
wiley   +1 more source

Evaluation of Some Proposed Methods for Protecting Bridge Substructure Using Physical Models [PDF]

, 2003
Bridges constructed across streams with erodable beds are normally subjected to serious scouring during the flood at piers and abutment sites. As a result, scour holes will be formed at the bridge substructure.
Ghazali, Abdul Halim, Jafaar, Mohd Saleh, Megat Mohd Noor, Megat Johari, Mohammed, Thamer Ahmed, Salem, Mohammed, Thanoon, Waleed Abdulmalik, Yusuf, Badronnisa   +6 more
core  

Addressing Biases in Ice Jam Observations by Integrating Multi‐Source Data in a Forested Fluvial Landscape, Southern Quebec

River Research and Applications, EarlyView.
ABSTRACT Exhaustive long‐term and large‐scale ice jam records are scarce in most cold river environments. Many discrete events occur in small, sparsely populated river systems and are poorly represented in open‐source databases. These observation biases are transferred to predictive models of ice jams and the collective understanding of their formation
Lisane Arsenault‐Boucher, Étienne Boucher, Rachid Lhissou, Karem Chokmani, Christophe Kinnard   +4 more
wiley   +1 more source