Abstract Groundwater flow depends on the heterogeneity of hydraulic properties whose field characterization is challenging. Recently developed active‐Distributed Temperature Sensing (DTS) experiments offer possibility to directly measure groundwater fluxes resulting from heterogeneous fields. Here, based fundamental principles and numerical simulations, two interpretation methods active‐DTS are proposed estimate both porous media thermal conductivities in sediments. These rely temperature...

For many environmental applications, the interpretation of fiber-optic Raman distributed temperature sensing (FO-DTS) measurements is strongly dependent on spatial resolution measurements, especially when objective to detect variations over small scales. Here, we propose compare three different and complementary methods estimate, in practice, “effective” DTS measurements: The classical “90% step change” method, correlation length estimated from experimental semivariograms, derivative method....

Hyporheic fluxes are typically regarded as highly variable both in space and time at the stream‐groundwater interface. However, Active‐Distributed Temperature Sensing (DTS) experiments conducted a losing river section demonstrated low spatial variability (one order of magnitude) remarkable temporal stability. In this abstract, we investigate potential reasons for observed notable stability hyporheic flows.Experiments were by burying several hundred meters heatable...

In heterogeneous aquifers, accurately characterizing groundwater flux and direction is crucial for predicting contaminant transport. Among emerging methods, Active-Distributed Temperature Sensing (Active-DTS) has proven to be highly effective estimating fluxes at high spatial resolution in porous media. Active-DTS measurements involve heating a Fiber Optic (FO) cable monitoring the associated temperature response. The elevation measured along heated section directly depends on aquifer, with...

The safe and effective deep geological disposal of nuclear waste depends on advanced technologies to monitor the degradation radioactive packages. However, long-term monitoring such facilities presents significant challenges, including restricted access packages need minimize intrusive equipment as sensors that must pass through protective containment barriers.This study explores feasibility benefits using high spatial resolution Distributed Optical Fiber Strain Sensing (DOFSS) for remote...

Thermal response tests are used to assess the subsurface thermal conductivity design ground-coupled heat pump systems. Conventional cumbersome and require a source of high power water circulating in pilot ground exchanger. An alternative test method using heating cable was verified field as an option conduct this injection experiment with low compact equipment. Two sections continuous were performed two experimental exchangers on different sites Canada France. The temperature evolution...

Abstract. Exchanges between groundwater and surface water play a key role for ecosystem preservation, especially in headwater catchments where discharge into streams highly contributes to streamflow generation maintenance. Despite several decades of research, investigating the spatial variability still remains challenging mainly because groundwater/surface interactions are controlled by multi-scale processes. In this context, we evaluated potential using FO-DTS (fibre optic distributed...

Abstract Active distributed temperature sensing (ADTS) experiments are very useful to provide in‐situ and estimates of thermal conductivities the subsurface groundwater flows. However, data interpretation can be seen as difficult considering large amount collected along a heated fiber‐optic cable lack associated tools for their automated analysis. In this context, we developed an routine program ADTS measurements: Toolbox. It contains several codes written in MATLAB that calculate, each...

Abstract Characterizing the spatiotemporal variability of water fluxes at stream‐groundwater interface is extremely challenging due to lack methods for estimating hyporheic flows different scales. To address this, we demonstrate potential Active‐Distributed Temperature Sensing (DTS) measuring and mapping flow in a lowland stream. Experiments were conducted by burying few hundred meters heatable Fiber‐Optic cables within streambed sediments large meander, where permanent stream‐losing...

Abstract. FO-DTS (Fiber Optic Distributed Temperature Sensing) technology has been widely developed to quantify exchanges between groundwater and surface water during the last decade. In this study, we propose, for first time, combine long-term passive-DTS measurements active-DTS in order highlight their respective potential locate discharge into streams. On one hand, consist monitoring natural temperature fluctuations detect localize inflows characterize temporal pattern of exchanges....

Understanding of transport processes is essential to identify the fate contaminants in surface and subsurface water. Quantification such requires a sound understanding quantification groundwater flow fields. Over past decades, efforts have been made develop propose field methods that provide direct estimates fluxes. The challenge able reflect complexity pathes aquifer systems. In this context, we investigated potential two estimate fluxes consolidated aquifers. Both FVPDM (Finite Volume...

For a long time, characterization of aquifers has been mainly based on the monitoring groundwater heads variations. This approach allowed to demonstrate that pressure changes induced by earth tides have significant and measurable impact monitored in confined aquifers. Nowadays efficient methods provide direct estimation fluxes. is case Finite Volume Point Dilution Method (FVPDM), single-well tracer experiment allows continuously quantifying flux variations over time. Yet, potential effect...

Managed Aquifer Recharge (MAR) is a viable method that has gained recognition for storing alternative waters in aquifers subsequent recovery or environmental benefits. It the potential to increase supply of fresh water and protect from overexploitation degradation, but it might also carry risk contaminating groundwater since recharge used may contain wide range organic inorganic contaminants. Therefore, important carefully assess quality these sources (such as runoff water) MAR implement...

Characterizing groundwater fluxes is essential in many hydrogeological studies, especially to assess contaminant transport the subsurface. In this context, Finite Volume Point Dilution Method (FVPDM) a single-well experiment consisting continuously injecting tracer into well and monitoring evolution of concentration same well. A part injected carried out by flow therefore higher dilution, lower remaining such tests, water within tested interval has be mixed using mixing pump order perfectly...

The monitoring of temporal variabilities groundwater flows is a critical point in many hydrogeological contexts, especially for the characterization coastal aquifers, sub-surface heterogeneities or else groundwater/stream interactions. Considering lack available methods, we investigate possibility and quantifying fluxes variations over time through active-Distributed Temperature Sensing (DTS) measurements. Active-DTS, consisting heating fiber optic cable, performs very well investigating...