Research on the multi-level intake water temperature effect of the Yalong River Jinping-I hydropower project

Wu, Shiyong; Cao, Wei Ping; Wang, Hongmei; Sun, Shu-Ming; Chen, Qiuwen

doi:10.1007/s11431-011-4628-1

Cited by 7 publications

(3 citation statements)

References 3 publications

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“…Remediating CWP is possible through a range of engineering and operational options (Sherman 2000;Michie et al 2020c). For example, multi-level outlets have been successful in mitigating thermal pollution (Du Xiaohu 2009;Wu et al 2011). Whereas retrofitting older dams may be costly (Sherman 2000), there are other infrastructure options such as trunnions, destratification mixers, bubble mixers and thermal curtains that divert warmer surface waters to low-level outlets (He et al 2017;Gray et al 2019;Michie et al 2020b).…”

Section: Remediation Optionsmentioning

confidence: 99%

Cold-water pollution impacts on two ‘warm-water’ riverine fish: interactions of dam size and life-history requirements

2023

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Context Temperature regulates most ecological processes in freshwater ecosystems. Anthropogenic changes to natural thermal regimes, especially cold water released from stratified impoundments (cold-water pollution, CWP), is a widespread and major threat to fish populations globally. Aims Because mitigation options for CWP are often expensive, we aimed to provide robust ecological evidence to inform expenditure. Methods We modelled population responses to CWP remediation for two warm-water fish species (Murray cod and golden perch) downstream of two impoundments (Copeton and Pindari dams) in the semi-arid northern Murray–Darling Basin, Australia. Key results Predicted populations of both species were severely affected by CWP at both sites; however, impacts were species- and site-specific. Effects were greater on golden perch than Murray cod because of their higher temperature requirements for spawning. Predicted spawning opportunities decreased by 77–100% for golden perch and by 38–92% for Murray cod. The larger Copeton Dam had greater impacts than did the smaller Pindari Dam. Conclusions Remediation of CWP can help restore populations and meeting the needs of golden perch may benefit a range of other species. Implications Globally, CWP is a serious threat to warm-water fishes that may compromise and even nullify other restoration efforts. However, restoration may be impeded by current low abundances, angler harvest and restrictions to fish passage.

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Section: Remediation Optionsmentioning

confidence: 99%

Cold-water pollution impacts on two ‘warm-water’ riverine fish: interactions of dam size and life-history requirements

2023

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“…The JSR and the YLR (the largest branch of the Jinsha River) are near the Qinghai-Tibet Plateau and are both typical mountain rivers [16,17]. The spatial distribution of multi-year average precipitation in the upper reaches of the JSR is in the range of 30 to 1000 mm, and the water vapor content over the basin is less than 15 mm, which is relatively scarce [18,19]. The lowest annual average water temperature in the upper reaches of the JSR is 0.3 • C, with a short ice cover period.…”

Section: Sample Collectionmentioning

confidence: 99%

Comparative Population Dynamics of Schizothorax wangchiachii (Cyprinidae: Schizothoracinae) in the Middle Reaches of the Yalong River and the Upper Reaches of the Jinsha River, China

Gao

Chen

et al. 2023

Animals

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To explore the differences in the growth characteristics and population dynamics of Schizothorax wangchiachii populations in the Jinsha River (JSR) and the Yalong River (YLR), samples were collected in the upper reaches of the JSR (n = 230) from 2019 to 2020 and the middle reaches of the YLR (n = 187) from 2017 to 2018. In the JSR and YLR populations, the age range was 11 and 12 years old, respectively, and the best growth equation was the Von Bertalanffy equation. The comparative analysis of the two populations showed that the growth coefficient, initial sexual maturity age and age at first capture of the YLR population were greater than those of the JSR population. Comparing the mortality rates of the two groups, we found that the YLR population had the higher female mortality rate (0.658 years−1) and the lower male mortality rate (0.453 years−1). Our assessment of the three natural mortality rates showed that the Fcur of both male and female populations was greater than F25%, indicating that both populations were in an overexploited state. Therefore, we suggest considering the two groups as separate protection units and implementing management measures such as ecological regulation, restoration of tributary habitat and strengthening of fishing ban monitoring to protect their resources.

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“…At present, they are employed for water intake to achieve selective withdrawal and mitigate the outflow temperature problem in many hydropower projects, e.g., Jingping-I, Guangzhao, Baihetan, Nuozhadu, etc. [11]. In the vicinity of the water intake, a stop-log gate forces all released The water head loss ΔH (m), between Sections 1 and 3, is an essential parameter for evaluation of the water intake.…”

Section: Introductionmentioning

confidence: 99%

Experimental and Numerical Investigations of Hydraulics in Water Intake with Stop-Log Gate

Ren

Wei

Xie

et al. 2020

Water

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A stop-log gate, installed in water intake of hydropower project, has become an effective facility in achieving selective withdrawal and temperature control for the sake of benefiting downstream ecosystems. Hence, it is of great importance to comprehensively explore the water intake hydraulics with the gate, not limited to some specific case studies. This study deals, through laboratory experiments and numerical simulations, with flow features of such a gate-functioned intake. The physical model test is used to validate the numerical simulation. Subsequently, a series of numerical cases considering different hydraulic and geometric conditions are performed to help look into the behaviors. Particular attention is paid to the flow regimes, head loss and flow velocity distributions. The results showcase the effect of the gate on the intake flow regime, and in terms of head loss and flow velocity distribution, the influences of the upstream water head, intake chamber width and withdrawal depth are revealed in detail. An empirical expression, with regard to the coefficient of head loss, is derived and validated by data from the available literature. Moreover, it is found that the maximum velocity at trash rack section is dependent exclusively on the relative withdrawal depth and always occurs at a certain height range above the gate. These results may provide a meaningful reference for the research of water intake with similar situations.

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Research on the multi-level intake water temperature effect of the Yalong River Jinping-I hydropower project

Cited by 7 publications

References 3 publications

Cold-water pollution impacts on two ‘warm-water’ riverine fish: interactions of dam size and life-history requirements

Cold-water pollution impacts on two ‘warm-water’ riverine fish: interactions of dam size and life-history requirements

Comparative Population Dynamics of Schizothorax wangchiachii (Cyprinidae: Schizothoracinae) in the Middle Reaches of the Yalong River and the Upper Reaches of the Jinsha River, China

Experimental and Numerical Investigations of Hydraulics in Water Intake with Stop-Log Gate

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