EnvironmentalWaveletTool: Continuous and discrete wavelet analysis and filtering for environmental time series

Galiana-Merino, Juan José; Pla, Concepción; Fernández-Cortés, Ángel; Cuezva, Soledad; Ortíz, Juan Carlos; Benavente, David

doi:10.1016/j.cpc.2014.06.011

Cited by 18 publications

(14 citation statements)

References 23 publications

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“…In this study the wavelet analysis was carried out by the MATLAB-based computer code Environmental Wavelet Tool (EWT) (Galiana-Merino et al, 2014).…”

Section: Signal Analysismentioning

confidence: 99%

Changes in the CO2 dynamics in near-surface cavities under a future warming scenario: Factors and evidence from the field and experimental findings

Pla

Cuezva

Garcia-Anton

et al. 2016

Science of The Total Environment

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This study is based in a field monitoring of a cave-soil-atmosphere system validated with laboratory experimentation. CO2 and 222 Rn dynamics in the cavity demonstrate the dependence on the climatic parameters, mainly on the differences between outdoor and indoor temperatures. Within the cave, the annual cycles are characterized by two outstanding moments: cave gaseous recharge and ventilation when cave acts as gaseous sink or source respectively. Relationship with soil above the cave exists permanently. Soil temperature and moisture are responsible for CO2 production at different time scales.Soil CO2 in Rull site reaches values higher than 3000 ppm in April-May, which falls to nearly 1000 ppm during the summer time. Due to CO 2 diffusion, maximum values in the cave are reached in the warmest months and are in accordance to soil CO2 values. Within the cave, maximum CO2 concentration is, in average, 3470 ppm while minimum is 623 ppm. Cave temperature and relative humidity remain quite stable with mean values of 16.1 ºC and 97.9% respectively. To describe field findings, CO2 production and diffusion experiments are developed related to soil behaviour. Results show that soil CO2 production increases as soil temperature and moisture increase according to a calculated logarithmic equation until water content in soil exceeds the saturation values. In addition, CO2 diffusion in Rull soil is reduced around 60% when water content in soil increases from 0 to 30%. Soil-produced CO2 reaches Rull cave, by diffusion. We estimate 57 kg of emitted CO2 from the cave to the atmosphere in an annual cycle, considering a volume of 9915 m 3 . Finally, projections of future climate in the study site confirm a general tendency for annual-mean conditions to be warmer and drier, which will directly affect soil CO2 production. Under this situation, Rull cave will experience changes in the stored and then exchanged annual amount of CO2.

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“…In this study the wavelet analysis was carried out by the MATLAB-based computer code Environmental Wavelet Tool (EWT) (Galiana-Merino et al, 2014).…”

Section: Signal Analysismentioning

confidence: 99%

Changes in the CO2 dynamics in near-surface cavities under a future warming scenario: Factors and evidence from the field and experimental findings

Pla

Cuezva

Garcia-Anton

et al. 2016

Science of The Total Environment

Self Cite

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“…The Morlet wavelet analysis is especially suited to sinusoidal signals and has been widely used in climate research [8,32]. In this study, Morlet wavelet analysis was adopted to investigate possible periodic variations of the monthly API for the four sample cities, because air pollution and climatic time series are usually sinusoidal.…”

Section: Wavelet Analysismentioning

confidence: 99%

Characterization of Air Pollution Index and Its Affecting Factors in Industrial Urban Areas in Northeastern China

Gong¹,

Hu²,

Liu³

et al. 2015

Pol. J. Environ. Stud.

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“…For this study case, based in previous studies with satisfactory results (Pla et al, ), Daubechies is the selected mother wavelet. The wavelet analysis and filtering of Mela signals is developed with the Environmental Wavelet Tool (Galiana‐Merino et al, ), a MATLAB‐based code designed to examine environmental time series. Although some briefly descriptions about wavelet theory are provided below, extended aspects of wavelet analysis may be consulted (e.g., Daubechies, ; Kaiser, ; Strang & Nguyen, ; Wickerhauser, ).…”

Section: Methodsmentioning

confidence: 99%

Validating the KAGIS black‐box GIS‐based model in a Mediterranean karst aquifer: Case of study of Mela aquifer (SE Spain)

Valdés-Abellán

Pla

Fernández-Mejuto

et al. 2018

Hydrological Processes

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Karst Aquifer GIS‐based model (KAGIS model) is developed and applied to Mela aquifer, a small karst aquifer located in a Mediterranean region (SE Spain). This model considers different variables, such as precipitation, land use, surface slope and lithology, and their geographical heterogeneity to calculate both, the run‐off coefficients and the fraction of precipitation which contributes to fill the soil water reservoir existing above the aquifer. Evapotranspiration uptakes deplete water, exclusively, from this soil water reservoir and aquifer recharge occurs when water in the soil reservoir exceeds the soil field capacity. The proposed model also obtains variations of the effective porosity in a vertical profile, an intrinsic consequence of the karstification processes. A new proposal from the Nash–Sutcliffe efficiency index, adapted to arid environments, is presented and employed to evaluate the model's ability to predict the water table oscillations. The uncertainty in the model parameters is determined by the Generalized Likelihood Uncertainty Estimation method. Afterwards, when KAGIS is calibrated, wavelet analysis is applied to the resulting data in order to evaluate the variability in the aquifer behaviour. Wavelet analysis reveals that the rapid hydrogeological response, typical of a wide variety of karst systems, is the prevailing feature of Mela aquifer. This study proves that KAGIS is a useful tool to quantify recharge and discharge rates of karst aquifers and can be effectively applied to develop a proper management of water resources in Mediterranean areas.

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EnvironmentalWaveletTool: Continuous and discrete wavelet analysis and filtering for environmental time series

Cited by 18 publications

References 23 publications

Changes in the CO2 dynamics in near-surface cavities under a future warming scenario: Factors and evidence from the field and experimental findings

Changes in the CO2 dynamics in near-surface cavities under a future warming scenario: Factors and evidence from the field and experimental findings

Characterization of Air Pollution Index and Its Affecting Factors in Industrial Urban Areas in Northeastern China

Validating the KAGIS black‐box GIS‐based model in a Mediterranean karst aquifer: Case of study of Mela aquifer (SE Spain)

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