Characterizing soil water content variability across spatial scales from optimized high-resolution distributed temperature sensing technique

Shehata, Mahmoud; Gentine, Pierre; Nelson, Natalie; Sayde, Chadi

doi:10.1016/j.jhydrol.2022.128195

Cited by 5 publications

(3 citation statements)

References 37 publications

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“…The selection of this particular FO cable was based on its durability, ruggedness, and ability to resist various stresses. Previous studies have confirmed these characteristics, as the cable was successfully installed in soil over large distances (several hundred meters) using a plow without sustaining any damage or additional non-uniform signal losses [ 27 , 29 ]. Thus, the FO cable was deemed suitable for enduring the stresses that the FO-DTS scour-monitoring device could encounter during field deployments, especially from the impact of fast-moving debris under severe flooding conditions.…”

Section: Methodsmentioning

confidence: 84%

“…The exact location of the temperature measurements along the FO cable can be determined by comparing the detection times of the Raman scatterings with the speed of light [ 24 , 25 ]. The unprecedented high-resolution temperature measurements obtained over large distances using the DTS technology were utilized to monitor and study different environmental and hydrological parameters, including but not limited to soil moisture content [ 26 , 27 , 28 , 29 , 30 , 31 ], groundwater upwelling [ 32 ], seepage rate in losing streams [ 33 ], wind speed, and temperature fluxes [ 22 , 34 , 35 ].…”

Section: Introductionmentioning

confidence: 99%

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High-Resolution Monitoring of Scour Using a Novel Fiber-Optic Distributed Temperature Sensing Device: A Proof-of-Concept Laboratory Study

Hatley

Shehata

Sayde

et al. 2023

Sensors

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Scour events can severely change the characteristics of streams and impose detrimental hazards on any structures built on them. The development of robust and accurate devices to monitor scour is therefore essential for studying and developing mitigation strategies for these adverse consequences. This technical note introduces a novel scour-monitoring device that utilizes new advances in the fiber-optic distributed temperature sensing (FO-DTS) technology. The novel FO-DTS scour-monitoring device utilizes the differential thermal responses of sediment, water, and air media to a heating event to accurately identify the locations of the interfaces between them. The performance of the device was tested in a laboratory flume under flow conditions with water velocities ranging from 0 m/s to 0.16 m/s. In addition, the effect of the measurement duration on the device’s measurement accuracy was also investigated. The FO-DTS scour-monitoring device managed to detect the sediment–water and water–air interfaces with average absolute errors of 1.60 cm and 0.63 cm, respectively. A measurement duration of fewer than 238 s was sufficient to obtain stable measurements of the locations of the sediment–water and water–air interfaces for all the tested flow conditions.

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Section: Methodsmentioning

confidence: 84%

Section: Introductionmentioning

confidence: 99%

High-Resolution Monitoring of Scour Using a Novel Fiber-Optic Distributed Temperature Sensing Device: A Proof-of-Concept Laboratory Study

Hatley

Shehata

Sayde

et al. 2023

Sensors

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“…The spatial dynamics of soil moisture are mainly influenced by soil texture, vegetation, and topographic patterns [17][18][19][20][21]. The impact of spatial heterogeneity of soil properties on the soil moisture budget has been extensively investigated using the scaling theory of soil hydraulic properties [22][23][24][25]. These studies show that the equivalent soil parameters, which were defined to capture the effects of spatial heterogeneity on the soil water budget [26], depend not only on the spatial characteristics of soils but also on the climate, particularly the precipitation processes [6,27,28].…”

Section: Introductionmentioning

confidence: 99%

Spatial and Temporal Variations in Soil Moisture for a Tamarisk Stand under Groundwater Control in a Hyper-Arid Region

Yi,

Luo,

Wang

et al. 2023

Water

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In hyper-arid regions, soil moisture’s role in ecohydrological processes can differ significantly from that in arid or semi-arid ecosystems. We investigated the spatial–temporal dynamics of soil moisture and its relationship with groundwater depths in a 200 m × 300 m phreatophytic tamarisk stand in the lower basin of the Tarim River, a hyper-arid zone in China. Soil moisture profiles, from the surface to the water table, were derived using drilling and oven-drying techniques. Over a three-year period, the soil moisture at multiple depths was continuously monitored in a specific plot using nine frequency domain reflectometry (FDR) sensors. Our results indicate a correlation between horizontal variations in soil moisture and groundwater depths (GWDs). Nevertheless, anomalies in this correlation were observed. Variations in horizontal soil moisture were strongly influenced by the clay content in the soil, with finer soils retaining more moisture. Despite varying GWDs, soil moisture profiles remained consistent, with no distinct correlation between them. Soil moisture exhibited stability across layers, with noticeable changes only adjacent to the water table. These results imply that in hyper-arid environments, soil texture primarily governs soil moisture distribution. However, the limited spatial and temporal scopes in our dataset, constrained by the region’s inhospitable conditions, necessitate further investigation. Future work should prioritize amalgamating diverse data sources to devise a region-specific soil moisture model for in-depth analysis of hyper-arid regions.

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Optimization of the number and locations of the calibration stations needed to monitor soil moisture using distributed temperature sensing systems: A proof-of-concept study

Shehata

Gentine

Nelson

et al. 2023

Journal of Hydrology

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Characterizing soil water content variability across spatial scales from optimized high-resolution distributed temperature sensing technique

Cited by 5 publications

References 37 publications

High-Resolution Monitoring of Scour Using a Novel Fiber-Optic Distributed Temperature Sensing Device: A Proof-of-Concept Laboratory Study

High-Resolution Monitoring of Scour Using a Novel Fiber-Optic Distributed Temperature Sensing Device: A Proof-of-Concept Laboratory Study

Spatial and Temporal Variations in Soil Moisture for a Tamarisk Stand under Groundwater Control in a Hyper-Arid Region

Optimization of the number and locations of the calibration stations needed to monitor soil moisture using distributed temperature sensing systems: A proof-of-concept study

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