Assessment of Total Evaporation Rates and its Surface Distribution by Tridimensional Modelling and Remote Sensing

Rocha, Sofia Midauar Gondim; Molinas, Ernesto; Rodrigues, Ítalo Sampaio; Neto, Iran Eduardo Lima

doi:10.2139/ssrn.4219132

Cited by 2 publications

(3 citation statements)

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“…Remote sensing (RS) provides a spatial view of evaporation from the surface of a reservoir. Generally, evaporation rates are higher at the edges of the water body and in the dam area than in the central part (Rodrigues et al, 2021a;Rocha et al, 2023). When comparing evaporation averages from the two reservoirs, the Santo Anastácio reservoir showed higher evaporation rates and less variability.…”

Section: Reservoir Evaporation Dynamics and Volume Lossesmentioning

confidence: 99%

Effects of Floating Macrophytes on Evaporation Rates in Tropical Reservoirs

Rodrigues

Costa

Teixeira

et al. 2023

Preprint

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Reservoir evaporation represents one of the most significant forms of water loss in tropical and semi-arid areas, but methods to accurately quantify evaporation fluxes at large scales are currently missing. The objectives of this study were: (1) to estimate evaporation in two Brazilian tropical reservoirs by calibrating the Stephens-Stewart equation through remote sensing, and (2) to assess the relationship between macrophyte coverage and evaporation. The calibrated Stephens-Stewart equation provided similar results to class A pan reference measurements (root mean square error of 0.8 mm/day). The two reservoirs yielded an evaporation volume that would be sufficient to meet the water needs of almost a million people. Furthermore, due to the poor water quality of one of the reservoirs, an important percentage of its surface area was covered by macrophytes. Macrophyte coverage was negatively correlated with the evaporation flux (R²=0.76), and led on average to an 11% reduction of the estimated evaporation rate. Overall, the results of this study demonstrate the usefulness of using remote sensing products to estimate reservoir evaporation and outline the need to better understand the relationship between macrophyte cover and reservoir evaporation in tropical and semi-arid areas.

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Section: Reservoir Evaporation Dynamics and Volume Lossesmentioning

confidence: 99%

Effects of Floating Macrophytes on Evaporation Rates in Tropical Reservoirs

Rodrigues

Costa

Teixeira

et al. 2023

Preprint

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“…In order to improve water resources management, water quality modeling in such water bodies has long been used as an important tool (Chapra, 2008). In this sense, several modeling approaches can be applied, including zerodimensional (Vollenweider, 1968;Mannich et al, 2015;Rocha & Lima Neto, 2021a, 2021b, one-dimensional (Araújo & Lima Neto, 2018;Araújo et al, 2019;Fraga et al, 2020;Carvalho & Bleninger, 2021), two-dimensional (Deus et al, 2013b;Lindenschmidt et al, 2019;Mesquita & Lima Neto, 2022;Rocha et al, 2022b) and tridimensional models (Deus et al, 2013a;Polli & Bleninger, 2019;Rocha et al, 2022a). A review of the effects of dimensionality on the performance of hydrodynamic models for lakes and reservoirs has been provided by Ishikawa et al (2022).…”

Section: Introductionmentioning

confidence: 99%

“…A review of the effects of dimensionality on the performance of hydrodynamic models for lakes and reservoirs has been provided by Ishikawa et al (2022). Multidimensional models including 2-D and 3-D approaches are generally used to simulate the hydrodynamics and thermal regime of the lakes and reservoirs, without necessarily modeling water quality parameters such dissolved oxygen, nutrients, algae, among others which are relevant to characterize the levels of eutrophication and compliance with respect to the required standards (Mesquita et al, 2020;Rocha et al, 2022aRocha et al, , 2022c. On the other hand, because of data scarcity and for the sake of simplicity, most recent water quality modeling studies still have focused on zero-dimensional models (Rocha & Lima Neto, 2021a, 2021bFerreira & Fernandes, 2022;Lima Neto et al, 2022).…”

Section: Introductionmentioning

confidence: 99%

Modeling water quality in a tropical reservoir using CE-QUAL-W2: handling data scarcity, urban pollution and hydroclimatic seasonality

Neto

2023

RBRH

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This study applies a 2-D hydrodynamic model (CE-QUAL-W2) for simulating water quality dynamics in a tropical reservoir located in Fortaleza, Ceará, Brazil. While rainfall concentrates basically in the first semester, this reservoir receives untreated sewage from an urban catchment throughout the year. To deal with data scarcity, model simplifications are justified and several adjustments are carried out, so that only the parameters temperature (T), dissolved oxygen (DO), chlorophyll a (Chla) and phosphate (PO4) are kept in the modeling process. Additionally, different assumptions are performed regarding the time-evolution of reservoir inlet concentrations: constant values, step and linear variations. The results indicate that the simplified model can predict well the seasonal variations of T, DO, Chla and PO4. The best fitting between model results and measurements are obtained with the assumption of linear variation in inlet concentrations, followed by the assumptions of constant values and step variation. Moreover, the results reveal that while PO4 presents a complete mixing behavior with a clear increase in concentration from the wet to the dry season, T, DO and Chla show an alternating stratification-destratification patter during the day-night but without relevant variations throughout the year. Model simulations of different scenarios also indicate a significant reduction in Chla concentration in the second semester, but external load reduction has a stronger impact on model outputs than hydroclimatic variability. The modeling approach developed in the present study is proposed as a simple way to cope with data scarcity, urban pollution and hydroclimatic seasonality in tropical reservoirs.

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Assessment of Total Evaporation Rates and its Surface Distribution by Tridimensional Modelling and Remote Sensing

Cited by 2 publications

References 0 publications

Effects of Floating Macrophytes on Evaporation Rates in Tropical Reservoirs

Effects of Floating Macrophytes on Evaporation Rates in Tropical Reservoirs

Modeling water quality in a tropical reservoir using CE-QUAL-W2: handling data scarcity, urban pollution and hydroclimatic seasonality

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