Comparative Study on Temperature Response of Hydropower Development in the Dry‐Hot Valley

Wang, D. C.; Zhang, X.; Huang, Yong; Wang, X.; Zhang, W.; Cao, Zejun; Yan, Xin; Qu, Ming

doi:10.1029/2021gh000438

Cited by 3 publications

(3 citation statements)

References 43 publications

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“…This led to notable changes in the water temperature rhythms at the PZH hydrological station, the first downstream control station of these reservoirs. According to this study, these changes, characterized by phase shifts in water temperature curves and a consistent increase in water temperature homogenization, underscore the significant role of cascade hydropower development in altering the thermal regime of the Jinsha River's middle reaches [67,70]. Additionally, the correlation between water and air temperatures downstream of cascade reservoirs in the middle reaches of the Jinsha River weakened significantly post-construction, indicating the potential for cascade reservoirs to disrupt the downstream air-water temperature synchronization [32,56].…”

Section: The Phase Offset Time Indexmentioning

confidence: 57%

“…Topography and geomorphology impact the meteorological and hydrological conditions of rivers, which in turn affect water temperature. In the Jinsha River basin, for example, the upper reaches are marked by high terrain and colder climate, while the middle reaches feature a dry-warm valley climate with higher temperatures [67,68], which explains that the value of ∆T in the middle and upper reaches of the Jinsha River is consistently greater than 0 • C/100 km, indicating a longitudinal warming trend in water temperature.…”

Section: The Phase Offset Time Indexmentioning

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: The Phase Offset Time Indexmentioning

confidence: 57%

Section: The Phase Offset Time Indexmentioning

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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“…Laxiwa hydropower station is 8.6 km away from the downstream Nina hydropower station, and is the second largest cascade hydropower station in the upper reaches of the Yellow River, with a total storage capacity of 10.79 Â 10 8 m 3 . The annual power generation of 102.23 Â 10 8 kW•h is about five times that of the Longyangxia hydropower station (Wang et al 2021).…”

Section: Study Area and Datamentioning

confidence: 98%

How does the daily regulation hydropower station reduce the hydrological regime impact? A case study in upper Yellow River

Yang,

Li,

et al. 2024

Hydrology Research

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The regulation of hydropower stations has profoundly altered river flow patterns. While studies have extensively assessed the impact of large or multiyear regulated hydropower stations on hydrological regimes using indicators of hydrological alteration (IHA) and range of variability approach (RVA), the impact of daily regulation hydropower stations has received comparatively less attention. This study aims to evaluate the influence of daily regulation hydropower stations on hydrological regime changes. The analysis focuses on the upper Yellow River region in China, which houses cascade hydropower stations, utilizing daily runoff data from the Guide hydrological station spanning from 1954 to 2020. The Mann–Kendall test revealed 27 of 32 IHAs with a significant trend when considering the operation of the multiyear regulated hydropower station (Longyangxia). However, this number decreased to 18 IHAs when daily regulation hydropower stations (Laxiwa and Nina) were included. Evaluation using the RVA method indicated that only 46.87% of IHAs showed high alterations from the natural regime when considering the operation of daily regulation hydropower stations, a decrease from 75.00% when solely considering Longyangxia. Findings suggest that daily regulation hydropower stations can effectively mitigate the adverse effects of multiyear regulated hydropower stations, bringing the hydrological regime closer to a natural state.

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A Preliminary Study on the Whole-Plant Regulations of the Shrub Campylotropis polyantha in Response to Hostile Dryland Conditions

Zhang,

Jiang,

Zhu

et al. 2024

Metabolites

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Drylands cover more than 40% of global land surface and will continue to expand by 10% at the end of this century. Understanding the resistance mechanisms of native species is of particular importance for vegetation restoration and management in drylands. In the present study, metabolome of a dominant shrub Campylotropis polyantha in a dry-hot valley were investigated. Compared to plants grown at the wetter site, C. polyantha tended to slow down carbon (C) assimilation to prevent water loss concurrent with low foliar reactive oxygen species and sugar concentrations at the drier and hotter site. Nitrogen (N) assimilation and turn over were stimulated under stressful conditions and higher leaf N content was kept at the expense of root N pools. At the drier site, roots contained more water but less N compounds derived from the citric acid cycle. The site had little effect on metabolites partitioning between leaves and roots. Generally, roots contained more C but less N. Aromatic compounds were differently impacted by site conditions. The present study, for the first time, uncovers the apparent metabolic adaptations of C. polyantha to hostile dryland conditions. However, due to the limited number of samples, we are cautious about drawing general conclusions regarding the resistance mechanisms. Further studies with a broader spatial range and larger time scale are therefore recommended to provide more robust information for vegetation restoration and management in dryland areas under a changing climate.

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Comparative Study on Temperature Response of Hydropower Development in the Dry‐Hot Valley

Cited by 3 publications

References 43 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

How does the daily regulation hydropower station reduce the hydrological regime impact? A case study in upper Yellow River

A Preliminary Study on the Whole-Plant Regulations of the Shrub Campylotropis polyantha in Response to Hostile Dryland Conditions

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