نتایج جستجو برای: sand layered soil

تعداد نتایج: 237372  

Due to population growth, global warming, changing precipitation patterns, and decreasing precipitation, water and soil are two of the most important human issues. Water and soil resources management in arid and semi-arid regions is one of the methods that can solve water and soil issues. Covering the soil surface with permeable natural materials can reduce water and wind erosion and evaporatio...

2017
Izael A. Lima Ascânio D. Araújo Eric J. R. Parteli José S. Andrade Hans J. Herrmann

Sand fences are widely applied to prevent soil erosion by wind in areas affected by desertification. Sand fences also provide a way to reduce the emission rate of dust particles, which is triggered mainly by the impacts of wind-blown sand grains onto the soil and affects the Earth's climate. Many different types of fence have been designed and their effects on the sediment transport dynamics st...

Journal: :Journal of Geotechnical and Geoenvironmental Engineering 2021

Offshore wind is a key part of the change toward renewable energy sources. farm developments are moving to sites that characterized by increased water depths and layered soil profiles, e.g., in North Sea. Suction caisson–based jacked structures expected be increasingly used support turbines at such sites. Experience suction caissons serving as foundations for offshore limited. The mechanisms go...

2016
X. M. Yang C. F. Drury W. D. Reynolds J. Y. Yang

We test the common assumption that organic carbon (OC) storage occurs on sand-sized soil particles only after the OC storage capacity on silt- and clay-sized particles is saturated. Soil samples from a Brookston clay loam in Southwestern Ontario were analysed for the OC concentrations in bulk soil, and on the clay (<2 μm), silt (2-53 μm) and sand (53-2000 μm) particle size fractions. The OC con...

2012
M. Naveen Saviour P. Stalin

–Sand is not only a precious mineral but also protecting the environment, buffer against strong tidal waves and storm, habitat for crustacean species and marine organisms, used for making concrete, filling roads, building sites, brick-making, making glass, sandpapers, reclamations, and in our tourism industry in beach attractions. Sand mining is the process of removal of sand and gravel where t...

2015
Matthew Heerman Ju-Lin Weng Ivy Hurwitz Ravi Durvasula Marcelo Ramalho-Ortigao Alvaro Acosta-Serrano

The midgut microbial community in insect vectors of disease is crucial for an effective immune response against infection with various human and animal pathogens. Depending on the aspects of their development, insects can acquire microbes present in soil, water, and plants. Sand flies are major vectors of leishmaniasis, and shown to harbor a wide variety of Gram-negative and Gram-positive bacte...

ژورنال: علوم آب و خاک 2019

Sediment selectivity during transport may provide basic information for evaluating on-site and off-site impacts of the soil erosion. Limited information is, however, available on the selectivity of sediments in rill erosion, particularly in the rainfed furrows. Toward this, the sediment selectivity was investigated in three soil textures (loam, loamy sand sand clay loam) under 10% slope using 9...

2005
Mohamed Ashour Gary Norris Sherif Elfass

Strain wedge (SW) model formulation has been used, in previous work, to evaluate the response of a single pile or a group of piles (including its pile cap) in layered soils to lateral loading. The SW model approach provides appropriate prediction for the behavior of an isolated pile and pile group under lateral static loading in layered soil (sand and/or clay). The SW model analysis covers the ...

Journal: :Environmental science & technology 2004
Wei Zheng Scott R Yates Sharon K Papiernik Mingxin Guo

Propachlor and other chloroacetanilide herbicides are frequently detected contaminants of groundwater and surface water in agricultural regions. The purpose of this work was to develop a new approach to remove propachlor residues from the environment via chemical remediation by the nitrification inhibitor thiourea. The transformation processes of propachlor and thiourea mixed in aqueous solutio...

2008
Jianye Ching Yi-Chu Chen Kok-Kwang Phoon

In recent years, geotechnical engineers have paid much attention on reliability-based design. The probability density functions (PDFs) of the uncertain soil parameters are required for the reliability-based design. Once these PDFs are obtained, reliability analysis can be conducted, and reliability-based design can be achieved. Among the soil parameters, soil strengths play important roles in g...

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