Investigations on magnetic characteristics of the soil and their influence on its dielectric response

Lekshmi, S.U. Susha; Singh, Devendrá; Baghini, Maryam Shojaei

doi:10.1016/j.clay.2018.03.023

Cited by 6 publications

(2 citation statements)

References 21 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…From the electrodynamic point of view, soils are a heterogeneous dispersed medium consisting of soil particles of several types with different sizes and mineral compositions. The influence of soil moisture on its dielectric properties has been studied in a large number of papers, among which one can distinguish [9][10]. At the same time, analytical modeling of the soils' dielectric properties seems to be a difficult task.…”

Section: Methodsmentioning

confidence: 99%

Bistatic system for radar sensing of soil moisture

Bazhenov

Sagdeev

Goncharov

et al. 2021

20th International Scientific Conference Engineering for Rural Development Proceedings

View full text Add to dashboard Cite

The article is devoted to the development of a method for determining the moisture content of the upper layers of agricultural lands on the basis of mathematical modeling of a radar signal reflected from the soil. For the radar study of the moisture content of agricultural lands, it is proposed to use remote sensing using relatively inexpensive unmanned aerial vehicles (UAVs) of a multi-rotor type (a bistatic system consisting of a radar transmitter and a radar receiver placed on two UAVs). At the same time, it is necessary to ensure a high probability of correct determination of soil moisture to a depth exceeding the groundwater level. In remote sensing, the reflection coefficient from the air-soil interface depends on the dielectric properties of the top soil layer and the polarization of the sounding signal. When modeling the reflected signal, it is advisable to represent the earth's surface as a flat-layered structure, the upper part of which will be represented by vegetation and heterogeneities followed by the area with a relatively constant dielectric constant value to the groundwater level and then the area with a linearly increasing conductivity. Studies have shown that the Brewster effect in soils manifests itself when the probe signal is perpendicularly polarized. When the soil surface is irradiated with a perpendicularly polarized radar signal at Brewster's angle, the required penetration depth of the probing signal is ensured, at which the reflected signal will contain enough information about the percentage of moisture in the upper soil layers. The information contained in changes in the amplitude and phase of the reflected radio signal is related to the structure and dielectric properties of the upper soil layers. On the basis of this information, rational agro-technical measures can be justified, both operational (watering, fertilization) and long-term (reclamation, drainage).

show abstract

Section: Methodsmentioning

confidence: 99%

Bistatic system for radar sensing of soil moisture

Bazhenov

Sagdeev

Goncharov

et al. 2021

20th International Scientific Conference Engineering for Rural Development Proceedings

View full text Add to dashboard Cite

show abstract

“…17). It should be noted that due to the spatial heterogeneity of the MSW, in its composition and density, the application of such probes and interpretation of the obtained results are a challenging task [201,202]. Through this exercise, it has been realized that by proper scheduling of leachate recirculation [147], the rate of decomposition of the MSW can be augmented up to a great extent [130].…”

Section: Decompositionmentioning

confidence: 99%

Novel Techniques to Simulate and Monitor Contaminant–Geomaterial Interactions

Singh

2019

Indian Geotech J

Self Cite

View full text Add to dashboard Cite

Generation of huge amount of the toxic and hazardous wastes coming out of various industrial and domestic activities is becoming a major threat to the society. In the long run, mainly because of nonscientific storage, disposal and closure, and due to the presence of undesirable concentration(s) of chemicals and radionuclides, elevated temperatures and microbial activity, these wastes (read contaminants) interact with geomaterials, viz., soils, rock mass, groundwater. This interaction, termed as contaminant-geomaterial interaction, depending upon the severity of the contaminant(s) and interaction time, might alter overall characteristics of the geomaterials. Unfortunately, conventional laboratory and field instrumentation techniques are not well equipped to capture such interaction(s) and the mechanisms that prevail in the geomaterials. Hence, to achieve these objectives, evolving adequate and workable strategies, and modalities, that are nondestructive, noninvasive and economical is desirable. In this context, author's association with several industries resulted in development of innovative, cost-effective, yet efficient techniques that facilitate laboratory and/or in situ simulation and monitoring of such interaction(s). Details of these techniques, the philosophy behind their creation and the way they can be employed for safeguarding geoenvironment, from deterioration, are presented and discussed in this paper. Also, a brief discussion on some of the real-life situations where such techniques can be applied easily, by suitably modifying them, is presented for the benefit of the aspiring researchers and professionals.

show abstract