| Texto completo | |
| Autor(es): |
Bertotto, Luis Eduardo
;
Reis, Alan
;
Tsuha, Cristina de Hollanda Cavalcanti
;
Wendland, Edson Cezar
Número total de Autores: 4
|
| Tipo de documento: | Artigo Científico |
| Fonte: | JOURNAL OF ROCK MECHANICS AND GEOTECHNICAL ENGINEERING; v. 18, n. 1, p. 12-pg., 2026-01-01. |
| Resumo | |
The dual-probe heat pulse (DPHP) is a well-established method for estimating soil moisture (theta) using soil thermal conductivity (lambda) and volumetric heat capacity (C-v). Recently, monitoring theta has been improved by integrating the DPHP method with distributed temperature sensing (DTS) technology. In the DPHP-DTS approach, a single fiber optic (FO) cable with embedded metallic constituents functions as a heating element, while a parallel cable serves to monitor the temperature. Despite ongoing advancements, challenges such as the difficulty in positioning heating and sensing cables and high energy requirements hinder the widespread adoption of the DPHP-DTS method. As alternative heating materials are seldom used, this study evaluated the feasibility of employing a resistive metallic alloy as the heating element in a laboratory DPHP-DTS application. Overall, higher errors were observed when assessing C(v )and lambda at higher theta values (>0.2), but using C-v data produced more accurate theta estimates (with the root mean square error (RMSE) <= 0.06). Based on C-v values, a low-power, long-duration heat pulse (8.07 W/m for 300 s) yielded more consistent theta estimates (RMSE = 0.04) than a high-power, short-duration pulse (15.93 W/m for 180 s, with RMSE = 0.06). The findings of this study also indicated that variations in heating uniformity and electrical power fluctuations potentially affected measurement accuracy. Nevertheless, the resistive alloy proved advantageous for DPHP-DTS due to its independent power connection, ability to maintain linear positioning within the soil, and potential for energy savings, all while providing reliable theta estimates. (c) 2026 Institute of Rock and Soil Mechanics, Chinese Academy of Sciences. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/bync-nd/4.0/). (AU) | |
| Processo FAPESP: | 15/03806-1 - Disponibilidade hídrica e riscos de contaminação em áreas de afloramento do Sistema Aquífero Guarani |
| Beneficiário: | Edson Cezar Wendland |
| Modalidade de apoio: | Auxílio à Pesquisa - Programa BIOEN - Temático |
| Processo FAPESP: | 23/08756-9 - Caracterização espaço-temporal da dinâmica da água em perfil vertical de solo não saturado, utilizando a medição de temperatura em fibra óptica aquecida |
| Beneficiário: | Luis Eduardo Bertotto |
| Modalidade de apoio: | Bolsas no Brasil - Doutorado |