Investigating transient seepage flow and heat transfer using optical fiber distributed temperature sensors and hydrothermal modeling

Ghafoori, Yaser (avtor), Lenart, Stanislav (avtor), Bohinc, Uroš (avtor), Kryžanowski, Andrej (avtor)

Seepage during the first filling of a reservoir is a critical aspect for earth dams and embankments safety, which requires precise monitoring. The thermometric method has demonstrated significant potential for detecting seepage anomalies through continuous temperature measurements using optical fiber distributed temperature sensing (DTS). However, most previous research has primarily focused on thermal monitoring when seepage flow reached a steady-state condition, which highlights the need for more research on seepage and heat transfer in transient state, particularly in unsaturated soils during the reservoir’s first filling. This paper addresses the transient seepage flow and heat transfer during the first filling of a laboratory sand model. Temperature variations within the sand were recorded using an optical fiber DTS, while seepage progression was tracked through digital imaging at regular intervals, followed by image processing. A coupled hydrothermal numerical model was also developed to simulate transient seepage flow and heat transfer within the unsaturated and variably saturated sand. In numerical modeling, heat dispersion and the thermal conductivity of sand were investigated through parameter calibration. Results indicate that thermal monitoring using optical fiber DTS is an effective method for estimating the development of the phreatic line during the first filling of the reservoir. Numerical simulations further revealed that seepage velocity plays a key role in the heat transfer process during transient seepage. Additionally, the results highlight that heat dispersion significantly influences heat transfer, particularly during transient seepage flow, whereas the effect of thermal conductivity is relatively minor as seepage progresses.

• Jezik: Angleški jezik
• Ključne besede: seepage, phreatic line, temperature, heat dispersion, optical fiber DTS
• Vrsta gradiva: Članek v reviji
• Tipologija: 1.01 - Izvirni znanstveni članek
• Organizacija: FGG - Fakulteta za gradbeništvo in geodezijo
• Status publikacije: Objavljeno
• Različica publikacije: Objavljena publikacija
• Leto izida: 2025
• Št. strani: 14 str.
• Številčenje: Vol. 165, pt. A, art. 108999
• PID: 20.500.12556/RUL-169108
• UDK: 620.1/.2
• ISSN pri članku: 1879-0178
• DOI: 10.1016/j.icheatmasstransfer.2025.108999
• COBISS.SI-ID: 235198211
• Datum objave v RUL: 12.05.2025

Gradivo je del revije

• Naslov: International communications in heat and mass transfer
• Založnik: Elsevier
• ISSN: 1879-0178
• COBISS.SI-ID: 175290371

Licence

• Licenca: CC BY 4.0, Creative Commons Priznanje avtorstva 4.0 Mednarodna
• Povezava: http://creativecommons.org/licenses/by/4.0/deed.sl
• Opis: To je standardna licenca Creative Commons, ki daje uporabnikom največ možnosti za nadaljnjo uporabo dela, pri čemer morajo navesti avtorja.

Sekundarni jezik

• Jezik: Slovenski jezik
• Ključne besede: pronicanje, freatična linija, temperatura, disperzija toplote, optična vlakna, DTS