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Álvaro González-Álvarez
Boswell Engineering, 330 Phillips Ave, South Hackensack, NJ 07606, USA

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Journal article
Published: 25 July 2020 in Hydrology
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In ungauged watersheds, the estimation of the time of concentration (Tc) is always a challenging task due to the intrinsic uncertainty involved when making assumptions. Given that Tc is one of the main inputs in a hydrological analysis for the design of hydraulic structures for stormwater management, ten equations (including one proposed in several local studies) and two Tc methodologies (overland flow time plus channel flow time) were used to compute the Tc in fifteen urban ungauged watersheds, located in Cartagena de Indias (Colombia), with different area sizes and slopes to statistically assess their performance against the value obtained via the Natural Resources Conservation Service (NRCS) velocity method (assumed to be the true value). According to the Nash–Sutcliffe efficiency index, none of the equations proved to be reliable in all watersheds as only four equations predicted the Tc value in 53% of the cases. In addition, based on the percent bias, all equations tended to significantly over- or underestimate the Tc, which affects the quantification of the runoff volume necessary for, among others, the implementation of best management practices for watershed management (e.g., conventional and/or sustainable drainage system design), flood-prone area delineation and flood risk analyses, urban planning, and stream restoration.

ACS Style

Álvaro González-Álvarez; José Molina-Pérez; Brandon Meza-Zúñiga; Orlando M. Viloria-Marimón; Kibrewossen Tesfagiorgis; Javier A. Mouthón-Bello. Assessing the Performance of Different Time of Concentration Equations in Urban Ungauged Watersheds: Case Study of Cartagena de Indias, Colombia. Hydrology 2020, 7, 47 .

AMA Style

Álvaro González-Álvarez, José Molina-Pérez, Brandon Meza-Zúñiga, Orlando M. Viloria-Marimón, Kibrewossen Tesfagiorgis, Javier A. Mouthón-Bello. Assessing the Performance of Different Time of Concentration Equations in Urban Ungauged Watersheds: Case Study of Cartagena de Indias, Colombia. Hydrology. 2020; 7 (3):47.

Chicago/Turabian Style

Álvaro González-Álvarez; José Molina-Pérez; Brandon Meza-Zúñiga; Orlando M. Viloria-Marimón; Kibrewossen Tesfagiorgis; Javier A. Mouthón-Bello. 2020. "Assessing the Performance of Different Time of Concentration Equations in Urban Ungauged Watersheds: Case Study of Cartagena de Indias, Colombia." Hydrology 7, no. 3: 47.

Journal article
Published: 18 June 2020 in Water Science and Technology
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The objective of this study is to model the breakthrough adsorption curves of Co (II) ions using spent tealeaves in fixed-bed column experiments. Spent leaves of green tea (GT), peppermint tea (PM) and chamomile (CM) were packed in glass columns with a diameter of 2 cm and height of 15 cm, and used as filters for the removal of the pollutant. Aqueous solutions of Cobalt (II) ions (100 mg/L) at pH 6 were prepared and pumped against gravity through the columns at a uniform flow rate of 5 mL/min. Breakthrough curves were fitted for the residual concentration data using the Thomas, Yoon-Nelson, and Clark models, with added empirical terms to delineate the lower tail of the breakthrough curve. These mathematical models were successfully linearized using the natural logarithm for parameter estimation. The results reveal that the Co (II) adsorption fits all three models for all the adsorbents. The Thomas model indicated that the calculated adsorption capacities followed the trend: PM > GT > CM with values of 59.7, 25.2, and 24.9 mg/g respectively. Moreover, CM showed the highest adsorption rates with all the mathematical models, whereas Yoon-Nelson theory provided evidence that PM has the longest 50% adsorption breakthrough among the adsorbents. Lastly, morphological and textural studies indicate that all spent leaves are good candidates as adsorbents due to their high surface heterogeneity. This study proposes the use of spent tealeaves as Co (II) adsorbents because they are inexpensive and environmentally beneficial.

ACS Style

Kibrewossen Tesfagiorgis; Abel E. Navarro; Bow Ming Chen; Nicholas Herrera; Joel Hernandez; Álvaro González-Álvarez; Ousmane Sy Savane. Simulations of breakthrough curves for fixed-bed column adsorption of Cobalt (II) ions on spent tea leaves. Water Science and Technology 2020, 81, 2410 -2421.

AMA Style

Kibrewossen Tesfagiorgis, Abel E. Navarro, Bow Ming Chen, Nicholas Herrera, Joel Hernandez, Álvaro González-Álvarez, Ousmane Sy Savane. Simulations of breakthrough curves for fixed-bed column adsorption of Cobalt (II) ions on spent tea leaves. Water Science and Technology. 2020; 81 (11):2410-2421.

Chicago/Turabian Style

Kibrewossen Tesfagiorgis; Abel E. Navarro; Bow Ming Chen; Nicholas Herrera; Joel Hernandez; Álvaro González-Álvarez; Ousmane Sy Savane. 2020. "Simulations of breakthrough curves for fixed-bed column adsorption of Cobalt (II) ions on spent tea leaves." Water Science and Technology 81, no. 11: 2410-2421.

Journal article
Published: 01 January 2020 in Gestión y Ambiente
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La explotación de gas y petróleo demanda millones de metros cúbicos de agua que se convierten en residuo. Esta agua de producción (AP) se reinyecta en los pozos o se vierte en la naturaleza; solo un mínimo volumen es tratado para ser reutilizado en la industria o la agricultura. El reúso es la opción más responsable porque implica devolver agua regenerada al ciclo natural, transformar en activo nuestro pasivo ambiental, alargar la vida del recurso, reducir los vertimientos y proteger la seguridad alimentaria de las poblaciones locales. Si bien el reúso del agua es ineludible para algunos países, debería serlo para todos. Si el AP es un bien y no un residuo, y su gestión es clave en la transformación hacia la economía circular, debemos reflexionar respecto al reto para la sostenibilidad y la oportunidad de alianza y negocio que representa. A continuación, se exponen aspectos generales y particulares del AP en Colombia, en donde el reúso fuera de la industria, es menos del 0,3% anual, mientras que el vertimiento sigue siendo una práctica usual de gran impacto sobre los ecosistemas. El desconocimiento sobre la tecnología disponible, los costos de inversión, la legislación y la necesidad de alianzas, son retos para lograr los beneficios del reúso; no solo respecto a su calidad y cantidad en la naturaleza, sino a los negocios emergentes que surgirían como oportunidades de mercado responsable en torno a un bien común.

ACS Style

Anabel Rial; Álvaro González-Álvarez. Reúso del agua de producción de hidrocarburos: reto y oportunidad. Gestión y Ambiente 2020, 23, 1 .

AMA Style

Anabel Rial, Álvaro González-Álvarez. Reúso del agua de producción de hidrocarburos: reto y oportunidad. Gestión y Ambiente. 2020; 23 (1):1.

Chicago/Turabian Style

Anabel Rial; Álvaro González-Álvarez. 2020. "Reúso del agua de producción de hidrocarburos: reto y oportunidad." Gestión y Ambiente 23, no. 1: 1.

Case report
Published: 22 November 2019 in Water
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In the Colombian Caribbean region, there are few studies that evaluated the behavior of one of the most commonly used variables in hydrological analyses: the maximum daily rainfall (Pmax-24h). In this study, multiannual Pmax-24h time series from 19 rain gauges, located within the department of Atlántico, were analyzed to (a) determine possible increasing/decreasing trends over time, (b) identify regions with homogeneous behavior of Pmax-24h, (c) assess whether the time series are better suited under either a stationary or non-stationary frequency analysis, (d) generate isohyetal maps under stationary, non-stationary, and mixed conditions, and (e) evaluate the isohyetal maps by means of the calculation of areal rainfall (Pareal) in nine watersheds. In spite of the presence of both increasing and decreasing trends, only the Puerto Giraldo rain gauge showed a significant decreasing trend. Also, three regions (east, central, and west) with similar Pmax-24h behavior were identified. According to the Akaike information criterion test, 79% of the rain gauges showed better fit under stationary conditions. Finally, statistical analysis revealed that, under stationary conditions, the errors in the calculation of Pareal were more frequent, while the magnitude of the errors was larger under non-stationary conditions, especially in the central–south region.

ACS Style

Orlando M. Viloria-Marimón; Álvaro González-Álvarez; Javier A. Mouthón-Bello; Viloria- Marimón; Mouthón- Bello. Analysis of the Behavior of Daily Maximum Rainfall within the Department of Atlántico, Colombia. Water 2019, 11, 2453 .

AMA Style

Orlando M. Viloria-Marimón, Álvaro González-Álvarez, Javier A. Mouthón-Bello, Viloria- Marimón, Mouthón- Bello. Analysis of the Behavior of Daily Maximum Rainfall within the Department of Atlántico, Colombia. Water. 2019; 11 (12):2453.

Chicago/Turabian Style

Orlando M. Viloria-Marimón; Álvaro González-Álvarez; Javier A. Mouthón-Bello; Viloria- Marimón; Mouthón- Bello. 2019. "Analysis of the Behavior of Daily Maximum Rainfall within the Department of Atlántico, Colombia." Water 11, no. 12: 2453.

Conference info
Published: 13 November 2019 in Energy Reports
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Transportation demands large amounts of fuel. In particular, road transport greatly contributes to both criteria air pollutants and noise within cities. The influence of vehicular traffic on the environmental noise spectrum (as an indirect indicator of energy emission) was measured and assessed in the tourist route of Santa Marta along a 12-km road segment where five points were selected (three in the peripheral urban and two in the suburban areas). The number and type of vehicles as well as the noise levels were recorded at thirds of octave twice per day during two different weekdays. The traffic flow was composed of automobiles, with higher values in the peripheral urban area. According to the ANOVA, the noise spectrum indicated that low frequencies both had more energy than those with high frequencies and were influenced by the time of day. Low frequencies were influenced by all type of vehicles during the day, while high frequencies at both day and night, except for trucks (which were influenced in all spectrum). The results agreed with both the high velocities reached and the vehicle distribution.

ACS Style

D.A. Jiménez-Uribe; D. Daniels; Álvaro González-Álvarez; A.M. Vélez-Pereira. Influence of vehicular traffic on environmental noise spectrum in the tourist route of Santa Marta City. Energy Reports 2019, 6, 818 -824.

AMA Style

D.A. Jiménez-Uribe, D. Daniels, Álvaro González-Álvarez, A.M. Vélez-Pereira. Influence of vehicular traffic on environmental noise spectrum in the tourist route of Santa Marta City. Energy Reports. 2019; 6 ():818-824.

Chicago/Turabian Style

D.A. Jiménez-Uribe; D. Daniels; Álvaro González-Álvarez; A.M. Vélez-Pereira. 2019. "Influence of vehicular traffic on environmental noise spectrum in the tourist route of Santa Marta City." Energy Reports 6, no. : 818-824.

Journal article
Published: 20 February 2019 in Water
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In Colombia, daily maximum multiannual series are one of the main inputs for design streamflow calculation, which requires performing a rainfall frequency analysis that involves several prior steps: (a) requesting the datasets, (b) waiting for the information, (c) reviewing the datasets received for missing or data different from the requested variable, and (d) requesting the information once again if it is not correct. To tackle these setbacks, 318 rain gauges located in the Colombian Caribbean region were used to first evaluate whether or not the Gumbel distribution was indeed the most suitable by performing frequency analyses using three different distributions (Gumbel, Generalized Extreme Value (GEV), and Log-Pearson 3 (LP3)); secondly, to generate daily maximum isohyetal maps for return periods of 2, 5, 10, 20, 25, 50, and 100 years; and, lastly, to evaluate which interpolation method (IDW, spline, and ordinary kriging) works best in areas with a varying density of data points. GEV was most suitable in 47.2% of the rain gauges, while Gumbel, in spite of being widely used in Colombia, was only suitable in 34.3% of the cases. Regarding the interpolation method, better isohyetals were obtained with the IDW method. In general, the areal maximum daily rainfall estimated showed good agreement when compared to the true values.

ACS Style

Álvaro González-Álvarez; Orlando M. Viloria-Marimón; Óscar E. Coronado-Hernández; Andrés M. Vélez-Pereira; Kibrewossen Tesfagiorgis; Jairo R. Coronado-Hernández. Isohyetal Maps of Daily Maximum Rainfall for Different Return Periods for the Colombian Caribbean Region. Water 2019, 11, 358 .

AMA Style

Álvaro González-Álvarez, Orlando M. Viloria-Marimón, Óscar E. Coronado-Hernández, Andrés M. Vélez-Pereira, Kibrewossen Tesfagiorgis, Jairo R. Coronado-Hernández. Isohyetal Maps of Daily Maximum Rainfall for Different Return Periods for the Colombian Caribbean Region. Water. 2019; 11 (2):358.

Chicago/Turabian Style

Álvaro González-Álvarez; Orlando M. Viloria-Marimón; Óscar E. Coronado-Hernández; Andrés M. Vélez-Pereira; Kibrewossen Tesfagiorgis; Jairo R. Coronado-Hernández. 2019. "Isohyetal Maps of Daily Maximum Rainfall for Different Return Periods for the Colombian Caribbean Region." Water 11, no. 2: 358.

Journal article
Published: 20 April 2018 in Fluids
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The 24-h maximum rainfall (P24h-max) observations recorded at the synoptic weather station of Rafael Núñez airport (Cartagena de Indias, Colombia) were analyzed, and a linear increasing trend over time was identified. It was also noticed that the occurrence of the rainfall value (over the years of record) for a return period of 10 years under stationary conditions (148.1 mm) increased, which evidences a change in rainfall patterns. In these cases, the typical stationary frequency analysis is unable to capture such a change. So, in order to further evaluate rainfall observations, frequency analyses of P24h-max for stationary and non-stationary conditions were carried out (by using the generalized extreme value distribution). The goodness-of-fit test of Akaike Information Criterion (AIC), with values of 753.3721 and 747.5103 for stationary and non-stationary conditions respectively, showed that the latter best depicts the increasing rainfall pattern. Values of rainfall were later estimated for different return periods (2, 5, 10, 25, 50, and 100 years) to quantify the increase (non-stationary versus stationary condition), which ranged 6% to 12% for return periods from 5 years to 100 years, and 44% for a 2-year return period. The effect of these findings were tested in the Gordo creek watershed by first calculating the resulting direct surface runoff (DSR) for various return periods, and then modeling the hydraulic behavior of the downstream area (composed of a 178.5-m creek’s reach and an existing box-culvert located at the watershed outlet) that undergoes flooding events every year. The resulting DSR increase oscillated between 8% and 19% for return periods from 5 to 100 years, and 77% for a 2-year return period when the non-stationary and stationary scenarios were compared. The results of this study shed light upon to the precautions that designers should take when selecting a design, based upon rainfall observed, as it may result in an underestimation of both the direct surface runoff and the size of the hydraulic structures for runoff and flood management throughout the city.

ACS Style

Álvaro González-Álvarez; Oscar E. Coronado-Hernández; Vicente S. Fuertes-Miquel; Helena M. Ramos. Effect of the Non-Stationarity of Rainfall Events on the Design of Hydraulic Structures for Runoff Management and Its Applications to a Case Study at Gordo Creek Watershed in Cartagena de Indias, Colombia. Fluids 2018, 3, 27 .

AMA Style

Álvaro González-Álvarez, Oscar E. Coronado-Hernández, Vicente S. Fuertes-Miquel, Helena M. Ramos. Effect of the Non-Stationarity of Rainfall Events on the Design of Hydraulic Structures for Runoff Management and Its Applications to a Case Study at Gordo Creek Watershed in Cartagena de Indias, Colombia. Fluids. 2018; 3 (2):27.

Chicago/Turabian Style

Álvaro González-Álvarez; Oscar E. Coronado-Hernández; Vicente S. Fuertes-Miquel; Helena M. Ramos. 2018. "Effect of the Non-Stationarity of Rainfall Events on the Design of Hydraulic Structures for Runoff Management and Its Applications to a Case Study at Gordo Creek Watershed in Cartagena de Indias, Colombia." Fluids 3, no. 2: 27.

Original articles
Published: 10 March 2015 in Hydrological Sciences Journal
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This work proposes an approach to automatically adjust the Curve Number (CN) to account for changes in vegetation density. Precipitation-runoff pairs from the MOdel Parameter Estimation EXperiment (MOPEX) dataset were used to estimate monthly simulated CNs (CNsim). Remotely sensed Greenness Fraction (GF) was used as a proxy for vegetation density. A relationship was established between CNsim and GF values and an adjustment factor was introduced. The coefficients of determination (R2) between the simulated and observed runoff when using the unadjusted and adjusted CNs were 0.63 and 0.80, respectively. Likewise, a Nash–Sutcliffe Coefficient (NSC) of –0.17 and 0.67 and Root Mean Square Error (RMSE) of 5.22 and 2.75 were also obtained for the unadjusted and adjusted CNs, respectively. The results evidence how the adjustments compensate the runoff overestimation when using the standard CN (CNstd) and also imply that the adjustment is crucial for improved hydrological modeling, particularly, for flood and flash flood monitoring and forecasting.

ACS Style

Álvaro González-Álvarez; Marouane Temimi; Reza Khanbilvardi. Adjustment to the curve number (NRCS-CN) to account for the vegetation effect on hydrological processes. Hydrological Sciences Journal 2015, 60, 591 -605.

AMA Style

Álvaro González-Álvarez, Marouane Temimi, Reza Khanbilvardi. Adjustment to the curve number (NRCS-CN) to account for the vegetation effect on hydrological processes. Hydrological Sciences Journal. 2015; 60 (4):591-605.

Chicago/Turabian Style

Álvaro González-Álvarez; Marouane Temimi; Reza Khanbilvardi. 2015. "Adjustment to the curve number (NRCS-CN) to account for the vegetation effect on hydrological processes." Hydrological Sciences Journal 60, no. 4: 591-605.