An Alternative Tensiometer Design for Deep Vadose Zone Monitoring

Kandelous, Maziar M.; Moradi, Barzin A.; Hopmans, Jan W.

doi:10.2136/sssaj2015.03.0121

Cited by 4 publications

(3 citation statements)

References 4 publications

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“…On the other hand, tensiometers measure pressure [kPa] and temperature [°C]. In order to evaluate soil suction, porous heads full of water were installed on the tensiometers, therefore the pressure measured by the tensiometers was the negative pressure of water flowing out of the porous heads and soil saturation is reached when the measured value is zero (Kandelous et al, 2015, Wu et al, 2015, Panzeri et al, 2022. As regards the ERT profiles, the measurements taken every 3-4 minutes show the variation of soil resistivity, which is related to the increase/decrease of water content (Hojat et al, 2019, Ivanov et al, 2020.…”

Section: Comparison With a Traditional Monitoring Systemmentioning

confidence: 99%

Application of Lucas-Kanade Dense Flow for Terrain Motion in Landslide Monitoring Application

Yordanov,

Truong,

Corti

et al. 2023

Int. Arch. Photogramm. Remote Sens. Spatial Inf. Sci.

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Abstract. Landslides are natural hazards that can cause severe damage and loss of life. Optical cameras are a low-cost and high-resolution alternative among many monitoring systems, as their size and capabilities can vary, allowing for flexible implementation and location. Computer vision is a branch of artificial intelligence that can analyze and understand optical images, using techniques such as optical flow, image correlation and machine learning. The application of such techniques can estimate the motion vectors, displacement fields, providing valuable information for landslide detection, monitoring and prediction. However, computer vision also faces some challenges such as illumination changes, occlusions, image quality, and computational complexity. In this work, a computer vision approach based on Lucas-Kanade optical dense flow was applied to estimate the motion vectors between consecutive images obtained during landslide simulations in a laboratory environment. The approach is applied to two experiments that vary in their illumination and setup parameters to test its applicability. We also discuss the application of this methodology to images from Sentinel-2 satellite optical sensors for landslide monitoring in real-world scenarios.

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Section: Comparison With a Traditional Monitoring Systemmentioning

confidence: 99%

Application of Lucas-Kanade Dense Flow for Terrain Motion in Landslide Monitoring Application

Yordanov,

Truong,

Corti

et al. 2023

Int. Arch. Photogramm. Remote Sens. Spatial Inf. Sci.

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“…Although some tensiometer models are currently presenting materials and modifications that enable their utilization in a wider range of ψ m (Kandelous et al, 2015), conventional tensiometers, such as those with mercury manometers, are still being used due to their notable accuracy and sensitiveness, serving as standard equipment for measuring other tensiometer models (Brito et al, 2009;Beraldo et al, 2012). In contrast, this conventional equipment has a drawback in that mercury represents a toxic metal of elevated risk to human health and the environment (Braga & Calgaro, 2010).…”

Section: Formato De Cápsula E Modo De Instalação Influenciando Determmentioning

confidence: 99%

Porous cup shape and installation mode influencing determinations of matric potential by tensiometers

Franco

Silva²,

Tormena

et al. 2017

Pesq. agropec. bras.

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-The objective of this work was to determine the measurement accuracy of the soil water matric potential (ψ m ) by puncture tensiometers with either rounded or pointed porous cups, installed with or without "soil mud", and to compare the performance of these tensiometers with that of tensiometers equipped with mercury manometers. The experiment was conducted in a Ultisol, in a randomized complete block design, in a factorial arrangement with five replicates. Puncture tensiometers with rounded porous cups, installed with "soil mud", present more elevated accuracy for ψ m determination in a wider measurement range, resembling tensiometers equipped with mercury manometers in drying soil.

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“…Neste cenário, diversos equipamentos como sonda FDR, sonda TDRs, sonda de nêutrons e tensiômetro, têm sido utilizados para o monitoramento da umidade ou da energia com que a água se encontra no solo, servindo como ferramenta no manejo da irrigação. Dentre eles, o tensiômetro é um equipamento prático, de baixo custo, além de ser o mais sensível e exato para a determinação do potencial mátrico da água no solo in situ (KANDELOUS;MORADI;HOPMANS, 2015;MONTESANO et al, 2015).…”

Section: Introductionunclassified

Desempenho De Sistemas De Leitura De Tensiômetro Em Condições De Temperatura Controlada

Azevedo

Freire

Alencar

et al. 2017

R_I

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DESEMPENHO DE SISTEMAS DE LEITURA DE TENSIÔMETRO EM CONDIÇÕES DE TEMPERATURA CONTROLADA JOSIMAR DE AZEVEDO1; ALCIONE GUIMARÃES FREIRE1; THIAGO LEITE DE ALENCAR1; CARLOS LEVI ANASTÁCIO DOS SANTOS1; RAIMUNDO NONATO DE ASSIS JÚNIOR1; FRANCISCO MARCUS LIMA BEZERRA2 E JAEDSON CLÁUDIO ANUNCIATO MOTA1 *Artigo extraído da dissertação do primeiro autor.1Departamento de Ciências do Solo, Universidade Federal do Ceará, UFC, Av. Mister Hull, 2977, 60.021-970, Fortaleza, CE, Brasil. E-mail: eng.azevedofmi@hotmail.com; alcionegf@hotmail.com; thiagoleitealencar@yahoo.com.br; carloslevi@hotmail.com; assisjr@ufc.br; jaedson.mota@ufc.br.2Departamento de Engenharia Agrícola, Universidade Federal do Ceará, UFC, Av. Mister Hull, 2977, 60.021-970, Fortaleza, CE, Brasil. E-mail: mbezerra@ufc.br. 1 RESUMO Objetivou-se aferir sistemas alternativos ao vacuômetro de mercúrio para a quantificação do potencial mátrico da água no solo, definir o tempo para reestabelecer o equilíbrio entre as tensões da água no interior do tensiômetro e no solo após a inserção da agulha do tensímetro no tensiômetro, e quantificar erros na determinação do potencial mátrico e da umidade a partir dos sistemas alternativos. O ensaio foi realizado em vasos, em laboratório, com três tensiômetros por vaso, seis repetições, nas profundidades de 0,20, 0,35 e 0,50 m. Definido o tempo de equilíbrio comparou-se o potencial mátrico e a umidade volumétrica nos três sistemas de leitura. Concluiu-se que a leitura do tensímetro pode ser realizada em quaisquer dos tempos desde 30 a 180 segundos; o tensímetro substitui o vacuômetro de mercúrio desde a saturação até a capacidade de campo, e o vacuômetro de Bourdon da condição na ou próxima à capacidade de campo até a situação mais seca; e os erros decorrentes dos sistemas alternativos se refletiram na estimativa da umidade do solo, com subestimativa dos valores a partir da capacidade de campo. Palavras-chave: Potencial mátrico, água no solo, irrigação. AZEVEDO, J.; FREIRE, A. G.; ALENCAR, T. L.; SANTOS, C. L. A.; ASSIS JÚNIOR, R. N.; BEZERRA, F. M. L.; MOTA, J. C. A.PERFORMANCE OF TENSIOMETER READING SYSTEMS UNDER CONTROLLED TEMPERATURE CONDITIONS 2 ABSTRACT The study aimed at assessing alternative systems to the mercury vacuum for quantification of water matric potential, to define the time for restoring the equilibrium between the water tension in the interior of the tensiometer, and in the soil after the insertion of the needle in the tensiometer, and to quantify errors in the determination of the water matric potential and the soil moisture from the alternative systems. The essay was carried out in pots in the laboratory. Three tensiometers were installed per pot, six replications, at depths of 0.20, 0.35 and 0.50 m. After the definition of the equilibration time, the matric potential and volumetric moisture were compared in the three systems. It was concluded that after the insertion of the needle of the tensiometer the reading can be performed in any of the times from 30 to 180 seconds; The tensiometer replaces the mercury vacuum gauge from saturation to field capacity and the Bourdon vacuum gauge from the condition at or near the field capacity to the driest condition; and the errors resulting from alternative systems were reflected in the estimation of the soil moisture whereas the alternative systems underestimated the values from the field capacity. Keywords: Matric potential, soil water, irrigation.

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An Alternative Tensiometer Design for Deep Vadose Zone Monitoring

Cited by 4 publications

References 4 publications

Application of Lucas-Kanade Dense Flow for Terrain Motion in Landslide Monitoring Application

Application of Lucas-Kanade Dense Flow for Terrain Motion in Landslide Monitoring Application

Porous cup shape and installation mode influencing determinations of matric potential by tensiometers

Desempenho De Sistemas De Leitura De Tensiômetro Em Condições De Temperatura Controlada

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