Multi-scale impact of climate change and cascade reservoirs on hydrothermal regime alteration in regulated rivers

Guo, Wenjuan; Yang, Huan; Ma, Yinchu; Hong, Fengtian; Wang, Hongxiang

doi:10.1016/j.ejrh.2022.101220

Cited by 3 publications

(6 citation statements)

References 49 publications

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“…These values determined that the establishment and operation of the reservoirs caused the downstream water temperature homogenization and lagging effect that have a cumulative impact over time [73][74][75]. On the seasonal scale, cascade reservoirs mainly store water in the cold season, leading to a longer water residence time, whereas in the warm season, the reservoirs have lower water levels, lower flow, and a shorter water residence time, resulting in the thermal regime downstream of the reservoirs being more significantly affected in the cold season [20,75]. For example, the mean value of I EC of each hydrological station in the lower reaches of Jinsha River in the cold season was about 0.15 lower than that in the warm season, the proportion of baseline deviation in the cold season was 49-93%, and the I PO in the cold season was 4.42-14.97 days higher than that in the warm season.…”

Section: Analysis Of Spatial and Temporal Distributions Of Water Temp...mentioning

confidence: 99%

“…Recently, in response to the increasing energy demand, significant new initiatives are currently underway in the field of hydropower development [18]. Many aspects of the disruption of river thermal regimes have received some attention, which mainly focus on the analysis of vertical water temperature within the reservoir region and downstream water temperature [19][20][21].…”

Section: Introductionmentioning

confidence: 99%

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Analysis of Water Temperature Variations in the Yangtze River’s Upper and Middle Reaches in the Context of Cascade Hydropower Development

Wang,

Ma,

et al. 2024

Water

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The establishment and operation of cascade reservoirs in the mainstream of the upper and middle reaches of the Yangtze River have changed the river’s thermal regimes. This study analyzed the correlation between water temperature and its influencing factors and employed various evaluation indexes—including ∆T (the temperature-increasing index, °C/100 km), IEC (the extreme fluctuation index), IBD (the baseline deviation index), and IPO (the phase offset time index). The aim was to uncover the variation characteristics and influencing factors of water temperature and quantify the impact of cascade reservoir construction on annual and seasonal water temperature rhythms. Our findings show that the construction and operation of cascade reservoirs weaken the synchronization of water temperature and air temperature downstream. The construction and operation of cascade reservoirs in the middle and lower reaches of the Jinsha River led to obvious homogenization, baseline deviation, and lagging effects on water temperature downstream, which intensified with the increase in storage capacity. These effects were more pronounced in colder months compared to warmer months. Additionally, the influence of tributaries and water–air heat exchange on these effects is alleviated to different degrees. These results are significant for assessing river ecological health in the context of cascade hydropower development.

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Section: Analysis Of Spatial and Temporal Distributions Of Water Temp...mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Analysis of Water Temperature Variations in the Yangtze River’s Upper and Middle Reaches in the Context of Cascade Hydropower Development

Wang,

Ma,

et al. 2024

Water

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“…Focusing on the individual and combined effects of climate change and artificial reservoir on river thermal dynamics, attribution analysis has been extensively conducted to quantify their contributions based on the reconstruction and simulation of WT process through data-driven model (Casado et al, 2013;Cheng et al, 2020;Guo et al, 2022;Van Vliet et al, 2011) and physically-based model (Grabowski et al, 2016;Loinaz et al, 2013;Norton & Bradford, 2009).…”

Section: Introductionmentioning

confidence: 99%

“…1.8 million Km 2 , flows eastward through 11 provincial administrative regions in China before reaching the East China Sea. The Yangtze River basin is characterized by a subtropical warm and humid climate, and its upper and mid-lower regions are affected by the Indian summer monsoon and East Asian summer monsoon, respectively.Abundant of world-class dams has been constructed in the YangtzeRiver basin, which significantly alter the riverine hydrological and thermal conditions by combining the influence of climate change(Guo et al, 2022). The Gezhouba Dam (GZBD) and Three Gorges Dam (TGD) are two representative dam projects in Yichang section of the Yangtze River.…”

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confidence: 99%

A quantification and classification framework for water temperature variation features induced by climate change and reservoir construction and operation: Application to the middle Yangtze River

Wang,

Shen

2024

Hydrological Processes

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Riverine water temperature (WT) is a crucial factor affecting habitat quality and ecological effect of aquatic ecosystems. To accurately quantify and classify WT variation features caused by climate change and reservoir construction and operation, a framework was developed that integrates multivariate vine copula model for accurately reconstructing the WT process and general evaluation indicators for comprehensively characterizing of WT variation. In this framework, month‐wise R‐vine copula models were employed to depict the multivariate dependence structure between WT and related hydrometeorological factors, and the change of WT process in the fluctuation range and thermal deviation was analogized as the change of simple harmonic wave in amplitude and phase. A testing‐oriented application of this framework in Yichang section of the Yangtze River highlighted that climate change and the Three Gorges Reservoir (TGR) dominated or participated in the fluctuation range changing and phase deviation of different monthly WT processes, as the ratios of affected months were 1.08:1 and 1.25:1 during the construction phase, and 1:2 and 1:1.28 during the operation phase. WT process also exhibited diverse monthly variation trends during construction and operation phases of the TGR. Therefore, it is inappropriate to neglect the impact of the TGR construction phase and climate change on WT variation. The proposed framework achieved systematic quantification and attribution analysis of WT variation, thereby providing an enhanced understanding of the variation characteristics of river thermal regimes under the individual and combined effects of climate change and artificial reservoir. Considering the significant influence of WT variation on aquatic organism reproduction, the identification of the sources and categories of monthly WT variation can also serve as a foundation for future targeted thermal and hydrological regime regulation, aiming to protecting aquatic species and preventing biodiversity loss.

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“…These developments change markedly the local landscape, causing economic, social, and environmental changes, drastically altering the natural dynamics of fisheries (Agostinho et al, 2007;Graeb et al, 2009; Petesse & Petrere Jr, 2011) and are exacerbated by climate change (Guo et al, 2022).…”

Section: Introductionmentioning

confidence: 99%

Temporal dynamics of size spectrum of a fish population in neotropical reservoirs

Sereia

Bueno

Almeida

et al. 2022

Int J Innov Educ Res

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Studies on the size spectrum allow indirect inferences of how the energy flows from one organism to another. Assuming that the bottom-up is more intense than the top-down mechanism along the cascade of reservoirs, which limits the growth and development of individuals, we investigated the effect of a cascade of reservoirs in a neotropical basin on the stock and distribution of the population of Oligosarcus longirostris, a species at the top of the food chain. Samples were conducted quarterly in five reservoirs, from March 2004 to December 2008. Stock size was estimated by catch per unit effort (CPUE); to establish the size spectra slopes of fish, we used Pareto I model, and data was analyzed using univariate analysis of variance followed by Tukey's test. There was a higher proportion of smaller individuals in the first reservoir of the cascade, with a decline in this proportion along the succession of reservoirs in the cascade. It can be concluded that there is an effect of the reservoir cascade on the abundance and size of individuals of Oligosarcus longirostris.

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Multi-scale impact of climate change and cascade reservoirs on hydrothermal regime alteration in regulated rivers

Cited by 3 publications

References 49 publications

Analysis of Water Temperature Variations in the Yangtze River’s Upper and Middle Reaches in the Context of Cascade Hydropower Development

Analysis of Water Temperature Variations in the Yangtze River’s Upper and Middle Reaches in the Context of Cascade Hydropower Development

A quantification and classification framework for water temperature variation features induced by climate change and reservoir construction and operation: Application to the middle Yangtze River

Temporal dynamics of size spectrum of a fish population in neotropical reservoirs

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