Rhodamine WT tracer experiments to check flow measurements in sewers

Lepot, Mathieu; Momplot, Adrien; Kouyi, Gislain Lipeme; Bertrand-Krajewski, Jean-Luc

doi:10.1016/j.flowmeasinst.2014.08.010

Cited by 16 publications

(14 citation statements)

References 14 publications

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“…It is available in the market as a 20% solution in water with specific gravity about 1.19. Rhodamine WT has been proven to be a very good tracer in surface water hydrology investigations because of its high solubility in water and very low photo-decomposition effect (Lepot et al, 2014;Minor et al, 2013). Tracer dilution method that was used in this study is based on conservation of injected tracer mass .…”

Section: Tracer Testmentioning

confidence: 99%

Hydraulic interconnections study of Seropan-Ngreneng-Bribin underground rivers in Gunung Kidul karst area using tracer technique

Sidauruk

Prasetio

Satrio

2018

IJW

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Series of studies have been conducted to investigate the hydraulic connection between Seropan underground rivers with other underground rivers in Gunung Kidul karst area. Stable isotopes composition, hydrochemical contents of collected samples from several sources around Seropan cave together with tracer tests that have been conducted in the area have helped us to establish hydraulic connection of Seropan underground river with adjacent underground rivers in Gunung Kidul karst area. Several tracer tests that have been conducted in the study area have revealed that subsurface water flowed from Seropan to Ngreneng cave with average travel time about six hours and 13 minutes. Analyses of breakthrough curves found from the tracer tests hinted that the flow is a direct flow with large well developed conduit without any significant delay due to water depressions and dead zones. Although downstream flow paths of Seropan underground river were successfully determined, however, upstream hydraulic connection were not been established. Future study should focus on the upper part (upstream) of Seropan cave.

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Section: Tracer Testmentioning

confidence: 99%

Hydraulic interconnections study of Seropan-Ngreneng-Bribin underground rivers in Gunung Kidul karst area using tracer technique

Sidauruk

Prasetio

Satrio

2018

IJW

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“…System water without dye was used for a blank to check the change in fluorescence compared to the standard. A 3-point calibration was conducted using standard dilutions of 0 ppt (deionised water), 10 ppt and 100 ppm (Wilson et al 1986, Hach Company 2004, Lepot et al 2014. Mean dye concentrations for each location were overlaid on aerial imagery to highlight the preferential flow patterns in the wetland.…”

Section: Methodsmentioning

confidence: 99%

Calculating the hydraulic efficiency of a constructed wetland

Harrington¹

2019

Water e-journal

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Measurement of the efficiency of constructed wetlands is critical for maintenance of their functions and contribution to improving water quality in urban areas. A fluorescent dye tracer, Rhodamine-WT, was used to track water flow through a stormwater-reliant, free water surface (FWS) constructed wetland in a Mediterranean climate. The mean hydraulic residence time (HRT) was calculated and compared to the design HRT, in order to gain an appreciation of the hydraulic efficiency of the wetland system. The actual HRT (4.0 days) was calculated to be less than the design parameters (7.0 days), giving the system a hydraulic efficiency of 0.57. Water movement was also tracked across the wetland profile to determine movement patterns within the system and identify any areas of short circuiting. A remediation design was then implemented and tested under experimental conditions. The remediation design increased the HRT from 4.0 to 5.6 days. This equates to a hydraulic efficiency of 0.80, which indicates good performance. Improvement to the flow patterns within the wetland was also demonstrated, with the influence of short circuits reduced. Nonetheless, further changes need to be implemented within the wider wetland area to encourage even distribution of water. Wetland processes are highly time dependent, therefore the ability to measure and maintain the efficiency of constructed wetlands is essential. This study demonstrates it is possible to improve the hydraulic residence time of a constructed wetland through changes to vegetation and obstructions to flow. It also demonstrates the benefits of dye tracer studies in tracking the lateral movement of water through the constructed wetland. The use of dye tracers is a costeffective and valuable method to measure the hydraulic parameters of a constructed wetland and should be incorporated into the ongoing management plan for stormwater-reliant free water surface constructed wetlands.

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“…Heiner and Vermeyen (2012), Lepot et al (2014), Maheepala et al (2001). In this paper, structural flow measurement errors are considered by testing calibration after reducing or increasing all flow observations by 40%.…”

Section: Other Sources Of Uncertaintymentioning

confidence: 99%

Calibration event selection for green urban drainage modelling

Broekhuizen

Maršálek

Viklander

2019

Preprint

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Abstract. Calibration of urban drainage models is typically performed based on a limited number of observed rainfall-runoff events, which may be selected from a longer time-series of measurements in different ways. In this study, 14 single- and two-stage strategies for selecting these events were tested for calibration of a SWMM model of a predominantly green urban area. The event selection was considered in relation to other sources of uncertainty such as measurement uncertainties, objective functions, and catchment discretization. Even though all 14 strategies resulted in successful model calibration, the difference between the best and worst strategies reached 0.2 in Nash–Sutcliffe Efficiency (NSE) and the calibrated parameter values notably varied. Most, but not all, calibration strategies were robust to changes in objective function, perturbations in calibration data and the use of a low spatial resolution model in the calibration phase. The various calibration strategies satisfactorily predicted 7 to 13 out of 19 validation events. The two-stage strategies performed better than the single-stage strategies when measuring performance using the Root Mean Square Error, flow volume error or peak flow error (but not using NSE); when flow data in the calibration period had been perturbed by ±40 %; and when using a lower model resolution. The two calibration strategies that performed best in the validation period were two-stage strategies. The findings in this paper show that different strategies for selecting calibration events may lead in some cases to different results for the validation period, and that calibrating impermeable and green area parameters in two separate steps may improve model performance in the validation period, while also reducing the computational demand in the calibration phase.

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Rhodamine WT tracer experiments to check flow measurements in sewers

Cited by 16 publications

References 14 publications

Hydraulic interconnections study of Seropan-Ngreneng-Bribin underground rivers in Gunung Kidul karst area using tracer technique

Hydraulic interconnections study of Seropan-Ngreneng-Bribin underground rivers in Gunung Kidul karst area using tracer technique

Calculating the hydraulic efficiency of a constructed wetland

Calibration event selection for green urban drainage modelling

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