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1. Instability of saturated granular materials in biaxial loading with polygonal particles using discrete element Method (DEM)

Author:
Khabazian, Masoud; Hosseininia, Ehsan Seyedi
Source:
Powder technology 2020 v.363 pp. 428-441
ISSN:
0032-5910
Subject:
sandy soils,   etc   ; deformation; particles; simulation models;     Show all 4 Subjects
Abstract:
... Sandy soils may become unstable under loading which causes large deformations and consequently, impose damages to existing structures. In this research, Discrete Element Method (DEM) is used to simulate 2D drained and undrained behavior of polygonal granular materials to investigate instability occurrence. The so-called cylinder method is applied to simulate the undrained behavior that a pipe is a ...
DOI:
10.1016/j.powtec.2020.01.013

2. Estimation of the wetting scanning curves for sandy soils

Author:
Zhai, Qian; Rahardjo, Harianto; Satyanaga, Alfrendo; Dai, Guoliang; Du, Yanjun
Source:
Engineering geology 2020 v.272 pp. 105635
ISSN:
0013-7952
Subject:
sandy soils,   etc   ; drying; equations; hysteresis; soil water characteristic;     Show all 5 Subjects
Abstract:
... It is known that the soil-water characteristic curve (SWCC) of unsaturated soils is hysteretic. The engineering properties of unsaturated soils during the drying process are different from those during the wetting process, and the difference can be related to the hysteresis of the SWCC. Therefore, understanding the hysteresis of the SWCC is crucial in engineering practices. In this paper, both the ...
DOI:
10.1016/j.enggeo.2020.105635

3. Microbiologically Induced Calcite Precipitation biocementation, green alternative for roads – is this the breakthrough? A critical review

Author:
Portugal, Carla Ribeiro Machado e; Fonyo, Carolyn; Machado, Carlos Cardoso; Meganck, Richard; Jarvis, Todd
Source:
Journal of cleaner production 2020 v.262 pp. 121372
ISSN:
0959-6526
Subject:
sandy soils,   etc   ; calcite; hydraulic conductivity; mechanical properties; microorganisms; organic soils; roads; rocks; soil stabilization;     Show all 9 Subjects
Abstract:
... The past fifteen years have been a rich developing field for Microbiologically Induced Calcite Precipitation (MICP) as an alternative to decrease the hydraulic conductivity of sandy soils or fractured rocks through biocementation formation. While significant development happened, the field still lacks a viable answer for the use of MICP for organic soil stabilization. Sandy soils or fractured rock ...
DOI:
10.1016/j.jclepro.2020.121372

4. A taxonomic revision of the genus Ancylobothrys (Apocynaceae, Plumerioidae) in South Africa, including the description of a new geoxylic species

Author:
Reddy, R.A.; Balkwill, K.; Ralepele, F.
Source:
South African journal of botany 2020 v.130 pp. 117-122
ISSN:
0254-6299
Subject:
sandy soils,   etc   ; Landolphia; fruits; grasslands; indigenous species; taxonomic revisions; South Africa;     Show all 7 Subjects
Abstract:
... In South Africa, Ancylobothrys Pierre was last revised in 1963, although the taxa were maintained within the genus Landolphia P. Beauv. Later authors separated Ancylobothrys from Landolphia citing the tendril-like inflorescence and the softly pubescent fruit of Ancylobothrys as two of the most obvious characters separating these genera. A geoxylic form related to Ancylobothrys petersiana (Klotzsch ...
DOI:
10.1016/j.sajb.2019.12.021

5. Biochar’s stability and effect on the content, composition and turnover of soil organic carbon

Author:
Han, Lanfang; Sun, Ke; Yang, Yan; Xia, Xinghui; Li, Fangbai; Yang, Zhifeng; Xing, Baoshan
Source:
Geoderma 2020 v.364 pp. 114184
ISSN:
0016-7061
Subject:
sandy soils,   etc   ; biochar; clay soils; environmental impact; humic substances; mineralization; soil minerals; soil organic carbon; temperature;     Show all 9 Subjects
Abstract:
... Extensive application of biochar to soil exerts a profound effect on organic carbon (OC) in soils. However, the impact of biochar on the content and composition of OC has not been comprehensively summarized. This review provided a detailed examination on the stability of biochar and its effect on the amount, composition and turnover of soil OC, with key limitations and issues recognized. The direc ...
DOI:
10.1016/j.geoderma.2020.114184

6. Investigation of relative permeability, saturation and capillary pressure relations of NAPL-contaminated sands

Author:
Mao, Baiyang; Liu, Zhibin; Liu, Songyu; Zhang, Menghuan; Lu, Taishan
Source:
Journal of soils and sediments 2020 v.20 no.3 pp. 1609-1620
ISSN:
1439-0108
Subject:
sandy soils,   etc   ; air; heptane; nonaqueous phase liquids; permeability; remediation; sand; soil vapor extraction; toluene;     Show all 9 Subjects
Abstract:
... PURPOSE: The relations among relative permeability, saturation degree and capillary pressure (kᵣ–S–P) in a three-phase system are important theoretical bases for the modelling of organic contaminant transport and physical remediation. The main purpose of this study was to investigate the kᵣ–S–P relations of organic contaminated sands. MATERIALS AND METHODS: Fine sand and medium sand were selected ...
DOI:
10.1007/s11368-019-02506-0

7. Support vector regression-based modeling of cumulative infiltration of sandy soil

Author:
Sihag, Parveen; Tiwari, N. K.; Ranjan, Subodh
Source:
ISH journal of hydraulic engineering 2020 v.26 no.1 pp. 44-50
ISSN:
2164-3040
Subject:
sandy soils,   etc   ; algorithms; data collection; infiltration (hydrology); models; prediction; regression analysis;     Show all 7 Subjects
Abstract:
... This paper examines the capability of the support vector machine-based regression approach to predict the cumulative infiltration from sandy soil. A data-set consisting of 413 cumulative infiltration measurements was used in the present analysis. Results drawn from radial basis function (RBF) and polynomial (poly) kernel-based support vector regression (SVR) were compared with multiple linear regr ...
DOI:
10.1080/09715010.2018.1439776

8. Effect of initial concentration and input flux on equilibrium and non-equilibrium transport of Zn in soil columns

Author:
Shahmohammadi-Kalalagh, S.; Taran, F.
Source:
International journal of environmental science and technology 2019 v.16 no.11 pp. 7565-7572
ISSN:
1735-1472
Subject:
sandy soils,   etc   ; adsorption; heavy metals; models; zinc;     Show all 5 Subjects
Abstract:
... In order to accurately predict contaminant transport in soil, the processes and factors affecting on this phenomenon should be identified, measured and mathematically defined. The amount of initial concentration and input flux (release rate) of contaminant are among these factors. In this study, transport of the heavy metal Zn in saturated sandy soil columns was simulated and evaluated by the equi ...
DOI:
10.1007/s13762-018-2159-z

9. Re-recognizing the impact of particle shape on physical and mechanical properties of sandy soils: A numerical study

Author:
Lu, Zhichun; Yao, Aiguo; Su, Aijun; Ren, Xingwei; Liu, Qingbing; Dong, Shan
Source:
Engineering geology 2019 v.253 pp. 36-46
ISSN:
0013-7952
Subject:
sandy soils,   etc   ; models; quartz; sand; shear strength;     Show all 5 Subjects
Abstract:
... The particle shape created by geological processes is an essential characteristic that determines the physical and mechanical properties of sandy soils. However, the nature of the arbitrary shape and the individual volume of particles in natural sand have been given scant regard. In this study, we constructed a particle flow code (PFC) model using a number of clumps with random irregular shapes (c ...
DOI:
10.1016/j.enggeo.2019.03.011

10. Measuring water repellency of individual particles: The new “micro-Wilhelmy Plate Method” and its applicability to soil

Author:
Vogel, J.; Balshaw, H.M.; Doerr, S.H.; Bryant, R.
Source:
Geoderma 2020 v.371 pp. 114384
ISSN:
0016-7061
Subject:
sandy soils,   etc   ; contact angle; hydrophobicity; image analysis; polymers; potential energy; video cameras; water repellent soils; wettability; Netherlands; United Kingdom;     Show all 11 Subjects
Abstract:
... Water repellency (hydrophobicity) of granular materials such as soil is usually assessed on bulk samples or arrays of grains, with their wettability being influenced by the often-variable properties of individual particles. Numerous methods exist to assess the wetting behaviour of granular bulk materials, whereas methods for determining the wettability of individual grains are scarce. Here we intr ...
DOI:
10.1016/j.geoderma.2020.114384

11. Decyl glucoside surfactant Triton CG-110 does not significantly affect the environmental fate of glyphosate in the soil at environmentally relevant concentrations

Author:
Carretta, Laura; Cardinali, Alessandra; Masin, Roberta; Zanin, Giuseppe; Cederlund, Harald
Source:
Journal of hazardous materials 2020 v.388 pp. 122111
ISSN:
0304-3894
Subject:
sandy soils,   etc   ; adsorption; clay; clay soils; environmental fate; environmental impact; glucosides; glyphosate; leaching; mineralization; sand; spraying; surfactants;     Show all 13 Subjects
Abstract:
... Glyphosate is the most common herbicide worldwide, and its impact on the environment has increasingly been scrutinized. Glyphosate-based formulations can contain co-formulants, among which are surfactants. This study aimed to investigate whether the presence of an alkyl polyglucoside-based surfactant, Triton CG-110, affects the adsorption, leaching, and mineralisation of glyphosate in the soil. Th ...
DOI:
10.1016/j.jhazmat.2020.122111

12. Diet selection and habitat use by the mountain vizcacha (Lagidium viscacia) in the Southern Andean Precordillera (Argentina)

Author:
Puig, Silvia; Rosi, María I.; Videla, Fernando; Seitz, Viviana P.
Source:
Mammalia 2020 v.84 no.4 pp. 323-335
ISSN:
1864-1547
Subject:
sandy soils,   etc   ; Ctenomys; Lama guanicoe; Lepus europaeus; altitude; diet; forbs; grasses; grasslands; habitat preferences; habitats; phenology; shrubs; Andes region; Argentina;     Show all 15 Subjects
Abstract:
... Lagidium viscacia is considered as a fragile species with patchy distribution, a strict habitat specialist and an obligatory diet specialist. The Southern Andean Precordillera constitutes an interesting environment to analyze the species’ presence across the altitudinal gradient. Diet selection and habitat use were studied in the summit plateau, characterized by rigorous conditions and vegetation ...
DOI:
10.1515/mammalia-2018-0148

13. Field study on performance of jet grouting in low water content clay

Author:
Bayesteh, H.; Sabermahani, M.
Source:
Engineering geology 2020 v.264 pp. 105314
ISSN:
0013-7952
Subject:
sandy soils,   etc   ; clay; clay soils; clods; cohesion; compression strength; energy; equations; quality control; sand; silt; water content;     Show all 12 Subjects
Abstract:
... One drawback to the application of jet grouting for soil improvement is quality control, especially the determination of the diameter and strength of the column, which depends on the technical specifications of the injection and soil type. It has been reported that the initial water content of the clay effects the erosion of cohesive particles. The compressive strength and diameter of a soilcrete ...
DOI:
10.1016/j.enggeo.2019.105314

14. Evaluation of the long-term performance of stabilized sandy soil using binary mixtures: A micro- and macro-level approach

Author:
MolaAbasi, Hossein; Naderi Semsani, Safoura; Saberian, Mohammad; Khajeh, Aghileh; Li, Jie; Harandi, Mohammad
Source:
Journal of cleaner production 2020 v.267 pp. 122209
ISSN:
0959-6526
Subject:
sandy soils,   etc   ; X-ray diffraction; brittleness; calcium silicate; cement; civil engineering; cohesion; compression strength; crystals; durability; friction; sand; sand stabilization; scanning electron microscopy; wet-dry cycles; zeolites;     Show all 16 Subjects
Abstract:
... The growing trend towards cement production for civil engineering applications has caused many environmental concerns, which can be addressed by the partial or total replacement of cement in civil construction projects. In the current study, the effect of partial cement replacement with zeolite (Z) on the behavior of poor-graded sandy soil was evaluated by means of a series of unconfined compressi ...
DOI:
10.1016/j.jclepro.2020.122209

15. A field-portable acoustic sensing device to measure soil moisture

Author:
Gorthi, Srikanth; Chakraborty, Somsubhra; Li, Bin; Weindorf, David C.
Source:
Computers and electronics in agriculture 2020 v.174 pp. 105517
ISSN:
0168-1699
Subject:
sandy soils,   etc   ; acoustics; ambient temperature; clay fraction; cost effectiveness; irrigation; models; monitoring; planning; prediction; soil organic carbon; soil texture; soil water; soil water content; water content; water resources;     Show all 16 Subjects
Abstract:
... For the last couple of decades, the idea of soil water measurement has gained widespread importance due to the spiraling crisis of global water resources. While several methods are being commonly used for soil water measurement, most of them do not satisfy all the essential requirements for water monitoring under field conditions including rapid on-site measurement and cost-effectiveness. This stu ...
DOI:
10.1016/j.compag.2020.105517

16. Intercropping switchgrass with hybrid poplar increased carbon sequestration on a sand soil

Author:
Collins, H.P.; Kimura, E.; Polley, W.; Fay, P.A.; Fransen, S.
Source:
Biomass and bioenergy 2020 v.138 pp. 105558
ISSN:
0961-9534
Subject:
sandy soils,   etc   ; Panicum virgatum; Populus canadensis; Populus generosa; biofuels; biomass; carbon dioxide; carbon sequestration; carbon sinks; cultivars; grasses; hybrids; intercropping; models; soil organic carbon; stable isotopes; trees;     Show all 17 Subjects
Abstract:
... Switchgrass (Panicum virgatum) has been identified as an important source of cellulosic biomass to produce biofuels and improve soil carbon storage. The natural ¹³C abundance of soils was used to calculate the quantity and turnover of C in a hybrid poplar (Populus x generosa and P. x canadensis) plantation intercropped with switchgrass. Levels of intercrop were grass cultivars inter-planted with p ...
DOI:
10.1016/j.biombioe.2020.105558

17. About calcium carbonate precipitation on sand biocementation

Author:
Cardoso, Rafaela; Pedreira, Rita; Duarte, Sofia O.D.; Monteiro, Gabriel A.
Source:
Engineering geology 2020 v.271 pp. 105612
ISSN:
0013-7952
Subject:
sandy soils,   etc   ; ammonia; ammonium; bacteria; biological treatment; calcite; calcium; calcium carbonate; carbon dioxide; carbon sequestration; chemical analysis; chemical treatment; compression strength; drying; hydrolysis; mercury; porosimetry; sand; urea;     Show all 19 Subjects
Abstract:
... The contribution of indigenous bacteria and of some possible precipitation due to chemical reactions occurring during the treatment of sandy soils through microbially induced calcite precipitation (MICP) is investigated in this paper considering two different grading size distributions. This is a novelty, because the presence of the feeding solution alone in the soil (usually used as control test, ...
DOI:
10.1016/j.enggeo.2020.105612

18. Effect of biochar on soil properties on the Loess Plateau: Results from field experiments

Author:
Luo, Chaoyi; Yang, Jingjing; Chen, Wen; Han, Fengpeng
Source:
Geoderma 2020 v.369 pp. 114323
ISSN:
0016-7061
Subject:
sandy soils,   etc   ; adsorption; ammonium nitrogen; biochar; fertilizers; field experimentation; nitrate nitrogen; nitrogen; nutrient retention; soil density; soil erosion; soil nutrients; soil organic carbon; total nitrogen; total phosphorus; China;     Show all 16 Subjects
Abstract:
... Soil erosion on the Loess Plateau has been partly controlled, but soil nutrients remain limited throughout the region. Biochar amendments are an efficient method of improving availability of soil nutrients due to their strong adsorptive capacity; however, the effects of biochar amendments on different soil types on the Loess Plateau are not well understood. In this paper, we compared the effects o ...
DOI:
10.1016/j.geoderma.2020.114323

19. Dynamic Simulation Tool of fertigation in drip irrigation subunits

Author:
González Perea, R.; Moreno, M.A.; Ortega, J.F.; del Castillo, A.; Ballesteros, R.
Source:
Computers and electronics in agriculture 2020 v.173 pp. 105434
ISSN:
0168-1699
Subject:
sandy soils,   etc   ; active ingredients; decision making; decision support systems; economic sustainability; environmental impact; farmers; farmers' attitudes; farms; fertigation; fertilizers; herbicides; irrigated farming; irrigation management; management systems; microirrigation;     Show all 16 Subjects
Abstract:
... Agriculture consumes approximately 95 million tonnes of fertilizers and 97,000 tonnes of active ingredients of pesticides and herbicides. Reducing external input systems can result in significant economic, social and environmental impact. Therefore, establishing an optimal fertigation schedule is essential to achieve efficient drip irrigation management and, therefore, achieve an optimal irrigated ...
DOI:
10.1016/j.compag.2020.105434

20. Precompression stress in response to water content and bulk density under no-till Oxisols in southern Brazil

Author:
Mendonça, Edwardo A.S.; de Lima, Renato P.; Dantas, Daniel da C.; Batista, Pedro H.D.; Giarola, Neyde F.B.; Rolim, Mário M.
Source:
Geoderma regional 2020 v.21 pp. e00261
ISSN:
2352-0094
Subject:
sandy soils,   etc   ; Oxisols; agricultural land; bulk density; clay; clay fraction; models; no-tillage; soil strength; soil texture; soil water; soil water content; traffic; water content; Brazil;     Show all 15 Subjects
Abstract:
... This study was designed to measure the variation of precompression stress (σₚ) with initial bulk density and initial water content and to propose pedo-transfer functions to estimate σₚ for two Brazilian no-till Oxisols. Undisturbed soil cores were randomly sampled (to obtain an as large as possible variation in bulk density) from two soils with 22 and 32% clay, equilibrated at matric suctions of 1 ...
DOI:
10.1016/j.geodrs.2020.e00261