Using TDR and modeling tools to investigate effects of interactive factors on preferential flow and transport in field sandy clay soil

2013 ◽  
Vol 71 (4) ◽  
pp. 1821-1838 ◽  
Author(s):  
Hasan Merdun
Keyword(s):  
Preferential Flow ◽  
Clay Soil ◽  
Modeling Tools ◽  
Flow And Transport ◽  
Sandy Clay ◽  
Interactive Factors

scholarly journals Simulating nonequilibrium movement of water, solutes and particles using hydrus – a review of recent applications

2008 ◽  
Vol 3 (Special Issue No. 1) ◽  
pp. S42-S51 ◽  
Author(s):  
J. Šimůnek ◽  
M. Köhne ◽  
R. Kodešová ◽  
M. Šejna
Keyword(s):  
Water Flow ◽  
Vadose Zone ◽  
Preferential Flow ◽  
Chemical Nonequilibrium ◽  
Nonequilibrium Processes ◽  
Modeling Tools ◽  
Flow And Transport ◽  
Wide Range ◽  
Flow Pathways ◽  
Physical And Chemical

Water and contaminants moving through the vadose zone are often subject to a large number of simultaneous physical and chemical nonequilibrium processes. Traditional modeling tools for describing flow and transport in soils either do not consider nonequilibrium processes at all, or consider them only separately. By contrast, a wide range of nonequilibrium flow and transport modeling approaches are currently available in the latest versions of the HYDRUS software packages. The formulations range from classical models simulating uniform flow and transport, to relatively traditional mobile-immobile water physical and two-site chemical nonequilibrium models, to more complex dual-permeability models that consider both physical and chemical nonequilibrium. In this paper we briefly review recent applications of the HYDRUS models that used these nonequilibrium features to simulate nonequilibrium water flow (water storage in immobile domains and/or preferential water flow in structured soils with macropores and other preferential flow pathways), and transport of solutes (pesticides and other organic compounds) and particles (colloids, bacteria and viruses) in the vadose zone.

Preferential Flow and Transport of Cryptosporidium parvum Oocysts through the Vadose Zone: Experiments and Modeling

2004 ◽  
Vol 3 (2) ◽  
pp. 736-736 ◽  
Author(s):  
Christophe J.G. Darnault ◽  
Tammo S. Steenhuis ◽  
Patricia Garnier ◽  
Young-Jin Kim ◽  
Michael Jenkins ◽  
...  
Keyword(s):  
Cryptosporidium Parvum ◽  
Vadose Zone ◽  
Preferential Flow ◽  
Flow And Transport ◽  
Cryptosporidium Parvum Oocysts

Effects of leachate on geotechnical characteristics of sandy clay soil

2013 ◽  
Author(s):  
N. S. Harun ◽  
Z. Rahman Ali ◽  
A. S. Rahim ◽  
T. Lihan ◽  
R. M. W. Idris
Keyword(s):  
Clay Soil ◽  
Sandy Clay ◽  
Geotechnical Characteristics

Yields of Tomatoes As Influenced By Application of Filter-Press Cake and Starter Solutions

1969 ◽  
Vol 48 (1) ◽  
pp. 55-59
Author(s):  
H. Azzam ◽  
G. Samuels
Keyword(s):  
Puerto Rico ◽  
Clay Soil ◽  
Press Cake ◽  
Filter Press ◽  
Marketable Yield ◽  
Tomato Production ◽  
Sandy Clay

An experiment using the Manalucie variety of tomato was established on a Vega Alta sandy clay soil at Río Piedras, P.R., with various combinations of filter-press cake, and starter solutions such as Folo-food, Growgreen, and 9-10-5, in addition to the regular commonly used fertilizer, 9-10-5. Filter-press cake increased the marketable yield by 6.76 tons. When filter-press cake was not applied the use of starter solutions failed to increase yields. A starter solution made from a 9-10-5 fertilizer was just as effective as the commercial starter solutions. The use of filter-press cake and/or starter solutions is recommended for tomato production in Puerto Rico.

Transport of Nanoplastic under groundwater aquifer flow and transport conditions

2020 ◽  
Author(s):  
Sascha Müller ◽  
Tonci Balic-Zunic ◽  
Nicole R. Posth
Keyword(s):  
Preferential Flow ◽  
Particle Diameter ◽  
Steric Interaction ◽  
Colloidal Transport ◽  
Flow And Transport ◽  
Aquifer Material ◽  
Transport Behavior ◽  
Groundwater Aquifers ◽  
Groundwater Aquifer ◽  
Aquifer Flow

<p>In terrestrial environments soils are hypothesized sinks for plastic particles. Nonetheless, due to the existence of preferential flow paths as well as a variety of geochemical and microbiological processes, this sink may only be temporary. A vertical translocation from soils to groundwater aquifers eventually occurs along different pathways. In these conditions Nanoplastic transport characteristics are similar to colloidal transport behavior. Therby the magnitude of plastic transport is eventually governed by complex interplay between the particle with its surrounding media (particle-particle, particle-solvent, particle- porous media) masked by different hydro-geochemical and microbiological conditions. The physical entrapment of particles (straining) may be significant when the particle diameter exceeds 5% of the median grain size diameter. Below that size additional electrostatic, van der Waals or steric interaction become increasingly important.</p><p>We present a preliminary dataset on the interaction between Nano-sized Polystyrene (PS) with different surface coatings and a variety of common minerals occurring in groundwater aquifers under the presence of Natural Organic Matter (NOM). The reference aquifer material is based on the Danish subsurface structure of Quaternary and Miocene aquifer material, e.g. quartz, calcite and pyrite among others. In our study, batch scale interactions are up-scaled in column flow and transport experiments, simulating different groundwater aquifer flow conditions in the presence of selected minerals and NOM.</p><p>This aims to clarify transport behavior of plastic pollutant in the subsurface environment. Furthermore, it serves as guide in qualitatively assessing and quantifying the vulnerability of groundwater aquifers to Nanoplastic pollution.</p>

scholarly journals The Effect of Pori Hole Distance Variation on Infiltration Capacity in Sandy Clay Soil Sample Drainage Channels

2021 ◽  
Vol 9 (3) ◽  
pp. 836-841
Author(s):  
Fenti Daud Sindagamanik ◽  
Sukmasari Antaria ◽  
Nenny T Karim ◽  
Fauzan Hamdi ◽  
Asriany Asrianyc
Keyword(s):  
Soil Sample ◽  
Clay Soil ◽  
Infiltration Capacity ◽  
Sandy Clay ◽  
Drainage Channels

scholarly journals A study of the microstructure of a bio-ash stabilized sandy clay soil

2021 ◽  
Vol 2 (2) ◽  
pp. 042-051
Author(s):  
Apampa O Ahmed ◽  
Oseni Kehinde ◽  
Popoola Monsuru
Keyword(s):  
Ion Exchange ◽  
Clay Soil ◽  
Lattice Structure ◽  
Research Work ◽  
Exchange Capacity ◽  
Sem Images ◽  
Ion Exchange Capacity ◽  
Sandy Clay ◽  
Small Doses ◽  
Stabilized Soil

This research work studies the microstructure of a sandy-clay soil as it is stabilized with corn cob ash (CCA) in dosage rates of 0-3%, in steps of 0.5%, and comparing with OPC-CCA blends (2:1) and OPC alone. The aim being to study the progressive flocculation and agglomeration of the molecules of the soil, upon the addition of varying blends of CCA- OPC in small doses. The samples were taken for microstructural examination using the scanning electron microscope (SEM), and for elemental composition using the Energy Dispersive X-ray Spectroscope (EDS). Corresponding samples of the stabilized soil were subjected to the unconfined compressive strength (UCS) tests. The cat-ion exchange capacity of the soil was also computed. The SEM images indicate that for the CCA stabilized soil, the lattice structure of soil molecules is most clearly defined at 1% CCA content. This is comparable to the cat-ion exchange capacity of the soil (1.17%), and also corresponds to the point of maximum UCS (313.7KN/m2). Significantly, the UCS value returned for CCA stabilized soil was higher than that for OPC alone and for the OPC-CCA blend, within the test range of this study. The paper concludes that a significant level of stabilization could be attained with this soil type, with small doses of CCA, without the need for OPC, whose effect is more pronounced at higher doses and at the pozzolanic phase.

Evaluation the effect of irrigation water salinity and Fusarium fungi on seven safflower cultivars

2014 ◽  
Vol 1 (1) ◽  
pp. 8-16
Author(s):  
Behnam Tahmasebpour ◽  
Alireza Babazade
Keyword(s):  
Sodium Chloride ◽  
Clay Soil ◽  
Block Design ◽  
Resistance Rate ◽  
Sandy Clay ◽  
Irrigation Water Salinity ◽  
Randomized Complete Block Design ◽  
Salinity Levels ◽  
Soil Clay ◽  
Fusarium Fungi

In order to study the effect of Salinity levels of Sodium chloride and Soil type on the characteristics of some grown seeds and the resistance rate of Fusarium fungi (quantitative length evaluation of necrotic part in plants gorget) in biotypes of safflowers, an experiment was factorically conducted by using two salinity levels of sodium chloride (20% and 50% salinitys), seven biotypes of acanaceous and non-acanaceous safflowers (Iraqi 222, IL111, K.H.64.68, and Varamin 295,Local Isfahan , Padideh and 340779), two types of soil (clay sandy-clay), in a three times randomized complete block design. The variance analyzing results showed that between the levels of all factors, there was meaningful difference for 2 studied characteristics. According to the results obtained from the comparison of factors means, genotypes of Iraqi 222, K.H.64.68 and 340779 under the condition of 20% salinity and genotype of Iraqi 222 under the condition of 50% salinity contained the most numbers of grown seeds. On the other hand the most resistance rate against Fusarium mushrooms was related to genotype K.H.64.68 under the condition of clay soil and 20% salinity, genotype IL111 under the condition of clay soil and 50% salinity and local genotype of Isfahan under the condition of sandy-clay soil with 20% salinity, Based on the results obtained from the linear regression and simple correlation coefficient there was positive and meaningful correlation between two evaluated characteristics in the probability level of 1% and the relation between them was estimated as linear and positive one (y=0/545+0/234X), where X refers to the number of grown seeds and y refers to the resistance against Fusarium.

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