Overview
The Jinping-I Dam, also designated as the Jinping-I Hydropower Station or the Jinping 1st Cascade, is a major hydroelectric facility located in Liangshan, Sichuan, China. It is situated on the Jinping Bend of the Yalong River. The project is operated by Yalong Hydro. The dam is a tall arch structure that holds the distinction of being the tallest dam in the world, with a height of 305 meters. This reservoir supplies the power station, which has an installed capacity of 3600 MW. The facility is operational and was commissioned in 2014. Construction on the project began in 2005 and was completed in 2014. The power station is designed to produce between 16 and 18 TW·h of electricity annually. The project's primary objectives include supplying energy for expanding industrialization and urbanization in the region, improving flood protection, and preventing erosion. The Jinping-I Dam represents a significant engineering achievement in global energy infrastructure.
Why it matters
Jinping-I Dam represents a landmark achievement in global civil and hydroelectric engineering, primarily distinguished by its status as the tallest arch dam in the world. Standing at 305 meters, this structure on the Jinping Bend of the Yalong River in Liangshan, Sichuan, China, sets a new benchmark for dam height, surpassing previous records and demonstrating advanced capabilities in concrete gravity and arch dam construction. The completion of this 305-meter-tall arch dam in 2014 marked the culmination of a construction period that began in 2005, solidifying its position as a critical infrastructure asset for the region and the nation. Its sheer scale is not merely architectural but functional, creating a massive reservoir that is essential for the efficient operation of the associated power station.
Strategic Role in the Yalong River Cascade
The Jinping-I Hydropower Station, also known as the Jinping 1st Cascade, plays a pivotal role within the broader Yalong River hydropower cascade. Operated by Yalong Hydro, the facility is designed to maximize the energy potential of the Yalong River, one of the most significant hydroelectric corridors in China. This substantial output is crucial for feeding into the regional and national grids, supporting the expanding energy demands driven by industrialization and urbanization. The dam's integration into the Yalong River cascade allows for optimized water flow management, enhancing the overall efficiency and reliability of power generation across multiple stages of the river system.
Regional Impact: Industrialization and Flood Control
Beyond energy generation, the Jinping-I Dam serves critical multi-purpose functions for the Liangshan region. The project's objectives explicitly include improving flood protection and preventing erosion, which are vital for the stability and development of the surrounding areas. By regulating the flow of the Yalong River, the dam mitigates the risk of seasonal flooding, protecting downstream communities and agricultural lands. Additionally, the reduction in soil erosion helps maintain the ecological balance and infrastructure integrity along the riverbanks. These benefits support the broader goals of industrialization and urbanization in Sichuan, providing a stable energy supply and enhanced environmental security for growing populations and industries.
| Metric | Value |
|---|---|
| Dam Type | Arch Dam |
| Height | 305 meters |
| Installed Capacity | 3,600 MW |
| Annual Production | 16–18 TW·h |
| Location | Yalong River, Liangshan, Sichuan |
| Operator | Yalong Hydro |
| Commissioned | 2014 |
Geography and Site Selection
The Jinping-I Hydropower Station is situated in the Liangshan Yi Autonomous Prefecture of Sichuan Province, China. The project spans the administrative boundaries of Yanyuan County and Muli County, positioning the infrastructure within a rugged, mountainous terrain characteristic of the upper reaches of the Yalong River. The specific site was selected at the Jinping Bend, a distinctive geographical feature of the river that offers exceptional hydraulic potential for hydroelectric generation. This location allows for the construction of a high-arch dam that leverages the natural topography to maximize head height while minimizing the volume of concrete required compared to gravity dams.
Topography of the Jinping Bend
The defining characteristic of the site is the dramatic meander of the Yalong River known as the Jinping Bend. The river flows for approximately 150 km along this meander, yet the straight-line distance between the upstream and downstream ends of the bend is only about 16 km. This geographical anomaly creates a significant elevation difference of roughly 310 m over a relatively short horizontal distance. Such a steep gradient provides a natural advantage for hydroelectric power generation, as it allows for a high hydraulic head without requiring an excessively long penstock system or an overly vast reservoir surface area relative to the volume of water stored.
The selection of this specific bend was critical to the engineering design of the Jinping-I Dam. The narrow separation between the river’s entry and exit points of the meander enabled the construction of the 305-meter-tall arch dam, which became the tallest dam in the world upon completion. The steep drop in elevation contributes directly to the plant’s capacity of 3,600 MW, as the potential energy of the water is converted efficiently into kinetic energy driving the turbines. The geological stability of the rock formations in Yanyuan and Muli counties also played a role in the site selection, ensuring that the foundation could support the immense hydrostatic pressure exerted by the reservoir. The integration of the dam into this specific topographical feature allows for effective flood protection and erosion control, objectives that complement the primary goal of energy supply for the region’s industrialization.
History of Planning and Construction
Planning for the Jinping-I Hydropower Station began in the 1960s, involving design institutes from Sichuan and Shanghai. In 1965, a project headquarters was established to coordinate early development efforts.
Construction Phase
Physical construction on the dam project commenced in 2005. The project involved building a 305-meter-tall arch dam on the Jinping Bend of the Yalong River in Liangshan, Sichuan, China. This structure is the tallest arch dam in the world.
| Year | Event |
|---|---|
| 1960s | Initial planning by Sichuan and Shanghai design institutes |
| 1965 | Establishment of project headquarters |
| 2005 | Construction begins |
| 2012 | Impoundment of the reservoir |
| 2014 | Project completion and commissioning |
The reservoir supplying the power station was impounded in 2012. The entire project was completed in 2014. The completed facility has a 3,600 MW capacity and produces between 16 and 18 TW·h annually. The project aims to support industrialization and urbanization, improve flood protection, and prevent erosion.
What are the engineering specifications of Jinping-I Dam?
The Jinping-I Dam is an arch dam with a height of 305 meters, making it the tallest dam in the world. The structure has a length of 568 meters and a volume of 7.4 million cubic meters. The dam creates a reservoir with a total capacity of 7.7 billion cubic meters, of which 4.9 billion cubic meters are active.
Spillway and Discharge Capabilities
The dam features a spillway system with discharge capabilities of 2993 cubic meters per second, 5465 cubic meters per second, and 3651 cubic meters per second. These discharge rates allow for effective flood protection and erosion prevention.
Power Station Specifications
The Jinping-I Hydropower Station has a total installed capacity of 3600 MW. The station produces between 16 and 18 terawatt-hours annually.
How does the power station operate?
The Jinping-I Hydropower Station operates as a high-head run-of-river facility, leveraging the significant elevation drop of the Yalong River at the Jinping Bend. The power generation infrastructure is housed in underground caverns, a design choice necessitated by the steep mountainous terrain of the Liangshan region in Sichuan. The station’s total installed capacity is 3,600 MW, achieved through the use of six vertical-axis Francis turbine-generator units, each rated at 600 MW. These large-capacity turbines are optimized for the high hydraulic head provided by the reservoir, allowing for efficient energy conversion from the potential energy of the stored water.
Hydraulic Operation and Water Diversion
The operational core of the Jinping-I project is the 305-meter-tall arch dam, which is recognized as the tallest dam in the world. This massive concrete structure creates a reservoir that regulates the flow of the Yalong River. The water diversion process involves channeling water from the reservoir through a system of penstocks that descend from the dam’s base to the underground powerhouse. The immense pressure generated by the 305-meter head drives water through the Francis turbines, spinning the rotors to generate electricity. This high-head configuration is critical for maximizing the output of the 600 MW units, distinguishing Jinping-I from lower-head hydroelectric projects that might require larger volumes of water flow to achieve similar power outputs.
Annual Production and Grid Integration
Once commissioned in 2014, the Jinping-I station contributes significantly to the regional energy mix. This substantial generation capacity supports the expanding industrialization and urbanization efforts in the Sichuan province and beyond. The power generated is fed into the national grid, helping to stabilize supply and demand in one of China’s major energy corridors. The operational status of the plant remains active, with continuous monitoring of turbine performance and reservoir levels to optimize output based on seasonal water availability.
Connection to Jinping-II
While Jinping-I is the primary high-head facility, its operation is intrinsically linked to the broader Jinping cascade system, which includes the downstream Jinping-II Hydropower Station. The water released from Jinping-I flows down the Yalong River to Jinping-II, allowing for a two-stage energy extraction process. This cascading arrangement maximizes the total energy yield from the same volume of water, enhancing the overall efficiency of the Yalong River hydroelectric corridor. The coordinated operation of these two stations ensures that flood protection and erosion prevention objectives are met while maintaining consistent power generation output throughout the year.
What are the environmental and social impacts?
The construction of the Jinping-I Dam necessitated significant social adjustments, primarily involving the relocation of approximately 7500 inhabitants from the floodplain and reservoir area. This displacement was a critical component of the project's social impact, affecting local communities in Liangshan, Sichuan, as the water levels rose to fill the reservoir created by the 305-meter-tall arch dam. The relocation efforts were integral to ensuring the operational efficiency of the 3600 MW power station and the stability of the reservoir, which is designed to produce between 16 and 18 TW·h annually. These social changes were part of the broader objective to supply energy for expanding industrialization and urbanization in the region, as noted in the project's foundational goals.
Reservoir-Induced Seismicity
Environmental monitoring of the Jinping-I Dam has highlighted concerns regarding reservoir-induced seismicity, a phenomenon where the weight of the water and the infiltration of groundwater into the bedrock trigger seismic activity. During the operational phase, specifically in 2013, the area recorded notable seismic events. These included earthquakes with magnitudes of 3.9 and 4.58, which were attributed to the reservoir's influence on the local geological structure. The occurrence of these earthquakes underscores the complex interaction between the massive 305-meter arch dam and the tectonic features of the Yalong River bend. Such seismic activity is a critical factor in the long-term environmental assessment of the dam, influencing maintenance strategies and safety protocols for the facility.
The environmental impact also extends to flood protection and erosion prevention, which are key objectives of the project. The reservoir helps regulate the flow of the Yalong River, reducing the frequency and severity of downstream flooding. Additionally, the dam plays a role in mitigating soil erosion, which is a significant issue in the mountainous terrain of Sichuan. These environmental benefits are balanced against the social costs of relocation and the ongoing monitoring of seismic activity, reflecting the multifaceted nature of large-scale hydroelectric projects in the region.
See also
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