Temperature mapping, thermal diffusivity and subsoil heat flux at Kariavattom of Kerala

Chacko, P. Tessy; Renuka, G.

doi:10.1007/bf02702224

Cited by 30 publications

(3 citation statements)

References 6 publications

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“…The surface layer accumulates heat more during the day due to solar radiation than the underlying layer, resulting in a temperature gradient in the soil [44]. The soil temperature was always greater in T2 S0/600 than in the T5 W300/300 at high temperatures.…”

Section: Discussionmentioning

confidence: 99%

“…The frequent application of water in the surface treatment increased the soil moisture content in the upper layer compared to the wicking treatment. Counterintuitively, the higher moisture content in the top layer of surface treatments may be the reason for the higher temperature, due to an increase in the thermal conductivity and diffusivity of wet soil [44][45][46]. Roots survive and grow where adequate water, temperature and oxygen are present [47].…”

Section: Discussionmentioning

confidence: 99%

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Evaluating the Efficiency of Wicking Bed Irrigation Systems for Small-Scale Urban Agriculture

2016

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A wicking bed (WB) is a plant driven system where plants receive water through capillary rise from a self-contained coarse material-filled subsoil reservoir. WBs have been widely promoted as a water-efficient irrigation solution for small-scale and urban food gardens. However, little published research exists to support popular claims about their effectiveness. In this study, the performance of WBs was compared with best-practice, precision surface irrigation in terms of water use efficiency (WUE), fruit yield, fruit quality and labour input, using tomato (Solanum lycopersicum) as the experimental crop. The influence of WB design variables (reservoir depths and soil bed depths) was tested. Results showed that WBs performed as well or better than precision surface irrigated pots, showing statistically significant improvement in WUE, yield and fruit quality. The results also suggest an optimum design exists for soil depth (where 300 mm outperformed 600 mm) but not reservoir depth (no difference between 150 and 300 mm). The WBs were more labour efficient, requiring significantly less frequent watering to achieve the same or better WUE. WBs are inherently low-tech and scalable and appear well-suited to a variety of urban agriculture settings.Horticulturae 2016, 2, 13 2 of 18 to rural water supplies for commercial horticulture [14,15]. There is therefore a great interest in the development of efficient irrigation systems which can secure urban water resources and provide urban gardeners with an economically efficient means of irrigation that is not technologically complex [16][17][18].Although improved practices exist for efficient crop irrigation in commercial farm management, there has been limited adoption of these techniques in urban areas due to the barriers of cost and knowledge to maintain them [18]. In urban gardens, the issues principally revolve around determining when and how much water needs to be applied to crops. For example, precision irrigation scheduling has been widely applied for efficient irrigation of large-scale monoculture crops. At the domestic and community garden scale, however, plants tend to be mixed and irrigation cannot be optimally scheduled to meet the needs of multiple crop water use patterns [19,20]. As a result, homeowners frequently apply more water than necessary, which leads to water loss as subsoil drainage [21]. Another major problem for urban growers is the labour invested in watering which may conflict with other activities [22]. In some regions, those interested in growing crops are not able to do so due to the presence of legacy contamination [23] or a shallow water table [24].Capillary wick irrigation has been investigated for some years as a method to deliver water to plants in container gardens [25]. Existing approaches include wicking mats, self-watering pots, and sub-irrigated planters [24,26]. The more recent "wicking bed" (WB) [27] has been characterized by a saturated media-filled reservoir beneath an unsaturated soil (root zone). Water is delivered by capillary acti...

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Evaluating the Efficiency of Wicking Bed Irrigation Systems for Small-Scale Urban Agriculture

2016

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“…The analytical methods provide explicit equations for apparent thermal diffusivity based on the amplitude or phase of the temperature wave measured at different depths [29]. One of the first analytical methods for in situ estimation considered the first harmonic of daily waves, as widely discussed in [30].…”

Section: Introductionmentioning

confidence: 99%

Thermal Diffusivity in the Subsoil: A Case Study in the Asturias (Northern Spain)

Marcos-Robredo,

Castro-García,

Rey-Ronco

et al. 2023

Energies

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This study presents a novel methodology for determining the apparent thermal diffusivity of subsoil in situ, employing two heat transfer models within the subsurface: one method is based on heat conduction caused by air temperature oscillations, while the other considers heat transmission via both conduction and convection due to groundwater flow. Differential equations were solved, and non-linear regression analysis was employed. This method has direct applications in various engineering and environmental domains, such as underground transmission lines, oil and gas pipelines, radioactive waste management, and geothermal systems, especially in the context of implementing horizontal geothermal collectors (HGC). The apparent thermal diffusivity value of 1.514 × 10−6 m2 s−1, within a 95% confidence interval spanning 1.512 × 10−6 m2 s−1 and 1.516 × 10−6 m2 s−1, was obtained from the section between 1.67 and 3.86 m depth in a research borehole located in Asturias, Northern Spain, using twenty-one temperature sensors. The method allowed for the calculation of the subsoil’s apparent thermal diffusivity up to a depth of 14.55 m.

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Monitoring and Impact Assessment of Climate Change on Agriculture Using Advanced Research Techniques

Chatterjee

Saha

Swain

et al. 2020

Soil Analysis: Recent Trends and Applications

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Temperature mapping, thermal diffusivity and subsoil heat flux at Kariavattom of Kerala

Cited by 30 publications

References 6 publications

Evaluating the Efficiency of Wicking Bed Irrigation Systems for Small-Scale Urban Agriculture

Evaluating the Efficiency of Wicking Bed Irrigation Systems for Small-Scale Urban Agriculture

Thermal Diffusivity in the Subsoil: A Case Study in the Asturias (Northern Spain)

Monitoring and Impact Assessment of Climate Change on Agriculture Using Advanced Research Techniques

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