Effects of floating macrophytes on open-water evaporation in a Brazilian tropical reservoir

IF 1.5 4区地球科学 Q3 GEOSCIENCES, MULTIDISCIPLINARY

Journal of South American Earth Sciences Pub Date : 2025-07-10 DOI:10.1016/j.jsames.2025.105683

Italo Sampaio Rodrigues , Carlos Alexandre Gomes Costa , Adunias dos Santos Teixeira , Iran Eduardo Lima Neto , Fernando Bezerra Lopes , José Carlos de Araújo

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Abstract

This paper aims to estimate the open-water evaporation (from 1990 to 2021) in an urban reservoir in Brazil and assess the relationship between floating macrophyte coverage (MC) and open-water evaporation, as well as their spatial variability. The Surface Energy Balance System for Water (AquaSEBS) provided similar (root mean square error of 0.5 mm/day) results to reference measurements of class A pan (correction coefficient of 0.7). The discharge of sewage into this urban tropical reservoir resulted in a portion of this reservoir being covered by floating macrophytes. During the study period, positive trends of floating MC area were observed. The days with floating macrophytes depicted higher spatial variability over the open-water evaporation. Furthermore, MC was negatively correlated with the open-water evaporation flux (R² = 0.65) and led on average to a 17 % reduction (varying from 9 % to 35 %) in the estimated evaporation rate in the free water surface. Overall, the results of this study demonstrate the usefulness of remote sensing products to estimate reservoir open-water evaporation and outline the need to better understand the relationship between MC and reservoir open-water evaporation in tropical and semi-arid areas.

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漂浮大型植物对巴西热带水库开放水域蒸发的影响

本文旨在估算巴西某城市水库1990 - 2021年的开放水域蒸发量，并评估漂浮大型植物覆盖度（MC）与开放水域蒸发量的关系及其空间变异性。水表面能量平衡系统（AquaSEBS）提供的结果与A类平底锅的参考测量结果相似（均方根误差为0.5 mm/天）（校正系数为0.7）。污水排放到这个城市热带水库导致水库的一部分被漂浮的大型植物覆盖。研究期间，MC浮动面积呈上升趋势。与开放水域蒸发量相比，浮游植物日的空间变异性更高。此外，MC与开放水域蒸发通量呈负相关（R2 = 0.65），导致自由水面估计蒸发速率平均降低17%（从9%到35%不等）。总的来说，本研究的结果证明了遥感产品在估计水库开放水蒸发方面的有效性，并概述了更好地理解热带和半干旱地区MC与水库开放水蒸发之间关系的必要性。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Journal of South American Earth Sciences 地学-地球科学综合

CiteScore

3.70

自引率

22.20%

发文量

364

审稿时长

6-12 weeks

期刊介绍： Papers must have a regional appeal and should present work of more than local significance. Research papers dealing with the regional geology of South American cratons and mobile belts, within the following research fields: -Economic geology, metallogenesis and hydrocarbon genesis and reservoirs. -Geophysics, geochemistry, volcanology, igneous and metamorphic petrology. -Tectonics, neo- and seismotectonics and geodynamic modeling. -Geomorphology, geological hazards, environmental geology, climate change in America and Antarctica, and soil research. -Stratigraphy, sedimentology, structure and basin evolution. -Paleontology, paleoecology, paleoclimatology and Quaternary geology. New developments in already established regional projects and new initiatives dealing with the geology of the continent will be summarized and presented on a regular basis. Short notes, discussions, book reviews and conference and workshop reports will also be included when relevant.