Morphohydraulic of a dam-impacted large river: The São Francisco River, Brazil

Panta, Genisson; Santos, Myrna Elis Ferreira; Melo, Jonas Herisson Santos de; Monteiro, Kleython de Araújo; Leli, Isabel Terezinha

doi:10.1016/j.jsames.2022.104167

Cited by 3 publications

(3 citation statements)

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“…Despite its size, the Juturnaíba reservoir's water regularity was restricted during the low rainfall year, as has been documented for other large reservoirs relying on dam management procedures for water uses (Jossette et al, 1999; Räsänen et al, 2017). Large reservoirs, on the other hand, can highly retain water during low rainfall times for accumulation reason, and fluvial retention by dams can be increased (Cook et al, 2010; Panta et al, 2023).…”

Section: Discussionmentioning

confidence: 99%

“…Differences in dam location, height, operational rules, reservoir age, water volume, surface area, river inflow, water residence and regional climate characterize the highly variability of the dam retention efficiency and effects in upstream and downstream reaches of a watershed (Chong et al, 2021; Maavara et al, 2014; Panta et al, 2023; Stevaux et al, 2009). Tropical countries have the majority of the world's large reservoirs.…”

Section: Introductionmentioning

confidence: 99%

“…watershed (Chong et al, 2021;Maavara et al, 2014;Panta et al, 2023;Stevaux et al, 2009). Tropical countries have the majority of the world's large reservoirs.…”

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confidence: 99%

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The retention efficiency of a large dam and reservoir eutrophication in a tropical coastal watershed under a rainfall reduction scenario

dos Reis Veríssimo,

Molisani

2024

Ecohydrology

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Tropical coastal rivers transport significant amounts of materials, and the dam's retention efficiency can affect hydrological processes generating impacts on reservoirs, such as eutrophication. Nevertheless, climate change projects uneven regional rainfall reduction, affecting surface water circulation and consequently the dam retention efficiency with possible effects on reservoir eutrophication. Here, we investigated the water, suspended particulate matter, and nutrient mass‐balance budgets in a large reservoir under a lowest rainfall year and effects on reservoir eutrophication in a tropical coastal watershed. Under low rainfall condition, the annual water budget showed that the dam water retention was limited, but the dam retained around 75% of the suspended particulate matter fluxes from the rivers. In terms of nutrients, the dam exported TN, TP and D‐Si while retaining PO43− on average; however, these circumstances fluctuated depending on the sample event. The reservoir's trophic state varied from mesotrophic to eutrophic possible reflecting the reduced dam's nutrient retention efficiency under influence of the low rainfall condition. However, 2 years following our sampling period, supereutrophic conditions and algal bloom were measured. Because human activities account for the majority of N and P loads across the watershed, mainly to soils, this biological response has been attributed to a greater rainfall regime that transfers N and P from soils to the reservoir.

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