Reservoir flood regulation affects nutrient transport through altering water and sediment conditions

Tang, Xianqiang; Li, Rui; Wang, Dan-Yang; Zheng, Jianhua; Zhang, Wei

doi:10.1016/j.watres.2023.119728

Cited by 19 publications

(3 citation statements)

References 33 publications

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“…Although the dam retention efficiency varies depending on the nutrient, a dam's ability to retain water and sediment influences nutrient dynamics (Tang et al, 2023). In contrast to water budgets, the dam efficiently held suspended particulate matter influx from rivers into the reservoir, as widely described in the literature (Chua & Xi, 2022; Syvitski et al, 2005; Vörösmarty et al, 2003).…”

Section: Discussionmentioning

confidence: 99%

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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Section: Discussionmentioning

confidence: 99%

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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“…Previous research has indicated that dams could mitigate downstream eutrophication pressure by retaining nutrients (Yamamoto, 2003), a phenomenon notably observed in large reservoirs located upstream. Nevertheless, on the watershed scale, particularly in relation to floating organic matter and minute suspended particles, there was a higher propensity for accumulation downstream through cascade dam spillways, contributing to heightened pollution levels (Tang et al, 2023).…”

Section: Effects Of Cascade Dams On Water Environmental Variablesmentioning

confidence: 99%

Cascade dams altered taxonomic and functional composition of bacterioplankton community at the regional scale

Jiang,

Liu,

Zhou

et al. 2023

Front. Microbiol.

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Dams are increasingly disrupting natural river systems, yet studies investigating their impact on microbial communities at regional scale are limited. Given the indispensable role of bacterioplankton in aquatic ecosystems, 16S rRNA gene sequencing was performed to explore how these communities respond to dam-influenced environmental changes at the regional scale in the Shaying River Basin. Our findings revealed that cascade dams create distinct environments, shaping bacterioplankton communities near the dams differently from those in natural rivers. In the upstream of the cascade dams, water quality was superior, while bacterioplankton community structure was simple with weak community interactions. In the midstream, nutrient and heavy metal content were increased, making bacterioplankton structures more susceptible to environmental changes. In the downstream of the cascade dams, water quality had a significant impact on the community and the bacterioplankton structures were highly complex. Additionally, environmental variables significantly influenced bacterioplankton functional groups. However, the response to these factors, as well as the interplay between functional and taxonomic diversity, varied markedly depending on the specific region of the cascade dams. We here delved into the effects of cascade dams on the taxonomic diversity and functional groups of bacterioplankton to provide a theoretical basis for segmentally regulating these dams.

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“…Further, it has been found that there is significant seasonal variation in the contents of organic matter and nitrifying bacteria in river sediments [11][12][13]. It is speculated that the changes in the responses of material transformation processes at the sediment interface may be an important process due to the effect of high inflow during the flood season [14,15]. However, fewer studies have been conducted on the effects of incoming flood water on material and energy transformations in sediments.…”

Section: Introductionmentioning

confidence: 99%

Changes in Bacterial Community Structure in Reservoir Sediments before and after the Flood Season

He,

Chen,

Zhou

et al. 2023

Diversity

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Bacterial communities are important components of reservoir ecosystems, participating in and determining the material–energy transformations within reservoirs. The intense material–energy transport during the flood season can cause perturbations to the stratified environment and material distribution within the reservoir, with the bacterial community being the most sensitive indicator of these changes. In this study, we analyzed sediments from four representative sampling sites before and after the flood season in a seasonally stratified reservoir and compared the diversity and composition of bacterial communities before and after the flood season using 16S rRNA high-throughput sequencing technology. The results showed that the bacterial community structure was different before and after flood season, and the bacterial abundance and α diversity were slightly higher before flood season than after flood season, and the relative abundance of bacteria was relatively low, and the dominant genera were not obvious. After flood season, the dominant genera were mainly Acinetobacter, Flavobacterium, Pseudomonas, Arthrobacter, and Massilia, all of which were aerobic denitrifying bacteria with strong denitrification ability. It is clear that the reservoir bacterial community structure changes significantly between flood seasons and plays a key role in later stages of aquatic ecology restoration. These results provide a new way of interpreting the dynamic changes in reservoir aquatic ecology.

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Reservoir flood regulation affects nutrient transport through altering water and sediment conditions

Cited by 19 publications

References 33 publications

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

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

Cascade dams altered taxonomic and functional composition of bacterioplankton community at the regional scale

Changes in Bacterial Community Structure in Reservoir Sediments before and after the Flood Season

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