Overview
Qingshan Dam is a concrete gravity forebay dam situated on the Dajia River in Heping District, Taichung, Taiwan. The facility serves as a critical component of the regional hydroelectric infrastructure, functioning as the second unit in a cascade of hydroelectric power plants along the river system. It is positioned directly below the Techi Dam and upstream of the Kukuan Dam, integrating into the broader water management and power generation network of the area. The dam is currently operational, having been commissioned in 1970.
The structure was constructed between 1964 and 1970. As a concrete gravity dam, it relies on its own weight to resist the horizontal force of the water. The dam stands 45 m high and extends 100 m in length. Its reservoir has a storage capacity of up to 600,000 m3. The associated hydroelectric power plant has an installed capacity of 360 MW, utilizing the water flow from the Dajia River as its primary energy source. The operator of the facility is. The dam plays a significant role in the hydroelectric cascade, contributing to the power output of the region through its strategic location between the Techi and Kukuan dams.
Location and Cascade Context
This concrete gravity forebay dam serves as a critical infrastructure node in the region’s hydroelectric network. Its reservoir has a storage capacity of up to 600,000 m3 (490 acre⋅ft), providing essential water regulation for downstream operations. Construction of the dam took place between 1964 and 1970, culminating in its commissioning in 1970. The facility remains operational, contributing to the energy output of the Dajia River system.
Cascade Positioning
Qingshan Dam functions as the second facility in a cascade of hydroelectric power plants along the Dajia River. Its strategic location is defined by its position directly below the Techi Dam and upstream of the Kukuan Dam. This sequential arrangement allows for optimized water flow management and energy generation across the river system. The cascade design enables the Techi Dam to regulate upstream inflows, which then feed into the Qingshan forebay, before continuing downstream to the Kukuan Dam. This interconnected structure maximizes the hydroelectric potential of the Dajia River corridor.
| Dam Name | Position in Cascade | Relative Location |
|---|---|---|
| Techi Dam | First | Upstream of Qingshan Dam |
| Qingshan Dam | Second | Below Techi Dam; Upstream of Kukuan Dam |
| Kukuan Dam | Third | Downstream of Qingshan Dam |
The geographic placement in Heping District, Taichung, provides the dam with access to consistent river flow from the Dajia River basin. This location supports the operational requirements of the 360 MW hydroelectric powerplant. The cascade configuration ensures that water resources are utilized efficiently across multiple generation points, enhancing the overall reliability of the regional power supply. The proximity of these dams allows for coordinated operational strategies, leveraging the natural topography of the Dajia River valley.
Construction History
Construction of the Qingshan Dam commenced in 1964 and concluded in 1970, establishing the facility as a key component of the hydroelectric infrastructure in Taiwan. The project was executed to create the second stage in a cascade of hydroelectric power plants along the Dajia River, situated in Heping District, Taichung. The six-year construction period resulted in a concrete gravity forebay dam designed to regulate water flow for downstream power generation.
Engineering and Structural Specifications
The Qingshan Dam is constructed as a concrete gravity structure, utilizing the weight of the concrete to resist the horizontal force of the water. This concrete gravity design provides stability through its massive cross-section, anchoring the structure firmly on the riverbed of the Dajia River.
The reservoir created by the dam has a storage capacity of up to 600,000 m3 (490 acre⋅ft). As a forebay dam, its primary engineering function is to maintain a consistent water level and flow rate for the hydroelectric turbines located downstream or integrated within the system. The structure is positioned directly below the Techi Dam and upstream of the Kukuan Dam, forming a critical link in the Dajia River cascade system. The operational status of the dam remains active, contributing to the regional energy mix with a capacity of 360 MW.
Technical Specifications
The Qingshan Dam is engineered as a concrete gravity forebay dam, a structural design chosen to manage the hydraulic load of the Dajia River in Heping District, Taichung, Taiwan. This specific configuration allows the structure to rely on its own weight to resist the horizontal force of the water, providing stability for its role within the regional hydroelectric cascade. The dam functions as the second facility in a series of hydroelectric power plants along the river, positioned directly below the Techi Dam and upstream of the Kukuan Dam. This strategic placement is critical for regulating water flow and maintaining optimal head pressure for power generation across the interconnected system.
Structural Dimensions and Reservoir Capacity
The physical scale of the Qingshan Dam is defined by its height, length, and reservoir volume, which were established during its construction between 1964 and 1970. The structure stands 45 m (148 ft) high, a dimension that contributes to the hydraulic head necessary for the installed capacity of 360 MW. The dam extends 100 m (330 ft) in length along the riverbed, creating a barrier that forms the forebay reservoir. The concrete gravity design ensures durability against the varying flow rates of the Dajia River, supporting the operational status of the plant since its commissioning in 1970.
| Parameter | Value |
|---|---|
| Dam Type | Concrete gravity forebay dam |
| Height | 45 m (148 ft) |
| Length | 100 m (330 ft) |
| Reservoir Volume | 600,000 m3 (490 acre⋅ft) |
| River | Dajia River |
| Location | Heping District, Taichung, Taiwan |
| Construction Period | 1964–1970 |
| Commissioning Year | 1970 |
| Installed Capacity | 360 MW |
| Operational Status | Operational |
The technical specifications reflect the engineering standards applied during the mid-20th century development of Taiwan's hydroelectric infrastructure. The concrete gravity design remains a robust choice for the Dajia River's geological and hydrological conditions, ensuring long-term operational reliability for the Qingshan facility.
How does the Qingshan Power Station generate electricity?
The Qingshan Power Station generates electricity by harnessing the potential energy of water stored in the reservoir behind the Qingshan Dam. As a concrete gravity forebay dam on the Dajia River, the structure holds back water to create a hydraulic head, which drives the turbines located within the power house.
Turbine Configuration and Capacity
The power station is equipped with four turbine-generator units. Each unit has an installed capacity of 90 MW, contributing to the plant’s total installed capacity of 360 MW. This configuration allows the station to modulate output based on water flow and downstream demand.
Annual Energy Generation
Under typical operating conditions, the Qingshan Power Station produces an annual generation of 591 million kilowatt-hours (kWh). This output is influenced by the reservoir’s storage capacity, which can hold up to 600,000 cubic meters of water, and the seasonal flow patterns of the Dajia River.
Why is Qingshan Dam significant in Taiwan's energy sector?
The Qingshan Dam serves as a critical component of Taiwan’s hydroelectric infrastructure, specifically functioning as the largest hydroelectric plant along the Dajia River basin. Located in Heping District, Taichung, this concrete gravity forebay dam is integral to the regional energy mix, providing a stable source of renewable power generated from water. The facility’s operational status remains active, contributing 360 MW of capacity to the grid, a figure that underscores its substantial role in the island's power generation landscape. This specific geographic arrangement allows for efficient water management and energy extraction, optimizing the flow from the upper reservoirs to downstream facilities.
The significance of the Qingshan Dam extends beyond its immediate electrical output. Its construction between 1964 and 1970 marked a major engineering achievement in Taiwan’s mid-20th-century energy development. Standing 45 m high and 100 m long, the dam creates a reservoir capable of storing up to 600,000 m3 of water. This storage capacity is vital for regulating the Dajia River’s flow, ensuring consistent power generation even during variable hydrological conditions. The dam’s design as a gravity forebay structure highlights the engineering priorities of the era, focusing on durability and efficient water diversion for power generation.
Within the broader context of Taiwan’s energy sector, the Qingshan Dam represents a key node in the Dajia River cascade system. The interplay between the Techi, Qingshan, and Kukuan dams demonstrates a sophisticated approach to hydroelectric resource utilization. By capturing and managing water flow across multiple stages, this system maximizes energy yield from the river. The 360 MW capacity of the Qingshan plant is a significant contribution to the regional grid, helping to balance the load with other energy sources. Its continued operation since 1970 also reflects the long-term reliability of well-maintained hydroelectric infrastructure, providing a consistent renewable energy supply that supports both local and national energy demands.
What distinguishes Qingshan Dam from other dams in Taiwan?
The Qingshan Dam is distinguished by its specific engineering classification as a concrete gravity forebay dam, a design choice that defines its operational role within the broader Dajia River hydroelectric cascade. Unlike primary storage dams that rely on massive reservoirs for seasonal water retention, a forebay dam functions primarily as a regulating pool. The Qingshan Dam stores up to 600,000 m3 (490 acre⋅ft) in its reservoir, a capacity tailored to smooth out flow variations rather than provide long-term storage. This limited storage volume is critical for stabilizing the water head for downstream turbines, ensuring consistent power generation efficiency across the cascade.
Position in the Dajia River Cascade
The dam’s strategic value is derived from its precise location in the sequence of hydroelectric plants along the Dajia River in Heping District, Taichung, Taiwan. It is the second dam in this cascade, situated directly below the Techi Dam and upstream of the Kukuan Dam. This intermediate position allows Qingshan to capture the outflow from the upper Techi Dam, regulate it, and then release it toward the lower Kukuan Dam. This sequential arrangement maximizes the energy extraction potential of the river’s gradient, as each dam utilizes the tailwater of its predecessor.
Physical Dimensions and Structural Design
Constructed between 1964 and 1970, the Qingshan Dam stands 45 m (148 ft) high and 100 m (330 ft) long. The concrete gravity design relies on the weight of the structure to resist the horizontal force of the water, a robust and proven engineering solution for the geological conditions of the Taichung region. The dam became operational in 1970, contributing 360 MW of capacity to Taiwan’s hydroelectric network. Its dimensions and capacity reflect a balance between structural stability and the specific hydrological demands of the Dajia River’s middle section, distinguishing it from larger storage-focused dams or smaller run-of-river installations elsewhere in the country.
Reservoir and Water Management
The Qingshan Dam functions primarily as a concrete gravity forebay dam, a design choice that prioritizes water storage and flow regulation for downstream hydroelectric generation rather than massive impoundment volume. This strategic positioning within the river system allows the Qingshan reservoir to act as a critical intermediate storage unit, smoothing out the water release patterns from the upstream Techi Dam before the water continues its journey to the Kukuan Dam. The dam's role in this cascade is essential for maintaining consistent water pressure and flow rates, which are vital for the efficient operation of the hydroelectric turbines located at or near the dam structure.
Reservoir Capacity and Storage
This volume is relatively modest compared to large-scale hydroelectric reservoirs, which is characteristic of a forebay dam designed for operational flexibility and short-term water management. The limited storage capacity means that the reservoir is not intended to hold water for extended periods, such as seasonal droughts, but rather to manage daily or weekly fluctuations in water inflow and outflow. This allows the power plant to adjust its generation output more responsively to changes in electricity demand along the Dajia River system.
The physical dimensions of the dam contribute to this storage capability. The concrete gravity structure stands 45 m (148 ft) high and spans 100 m (330 ft) in length. These dimensions create a sufficient basin to hold the 600,000 m3 of water, providing a buffer that helps regulate the water flow from the Techi Dam. The forebay function ensures that the water entering the power plant's intake is relatively free of large sediments and debris, which can be trapped in the reservoir before the water is channeled into the turbines. This sediment management is crucial for maintaining the efficiency and longevity of the hydroelectric equipment, reducing wear and tear on the turbine blades and other mechanical components.
Water Management and Cascade Integration
Water management at the Qingshan Dam is closely integrated with the operations of the entire Dajia River cascade. The dam receives water from the Techi Dam, which is the first in the series, and releases it towards the Kukuan Dam, the third in the sequence. This interconnected system requires coordinated water release schedules to optimize power generation across all three dams. The Qingshan Dam's reservoir acts as a balancing point, storing excess water during periods of high inflow from Techi and releasing it during periods of lower inflow or higher downstream demand. This coordination helps to maximize the overall energy output of the Dajia River hydroelectric system, ensuring that water is used efficiently and that power generation is as consistent as possible.
The operational status of the Qingshan Dam has been maintained as operational since its commissioning in 1970. The construction of the dam took place between 1964 and 1970, a period during which the Dajia River was being developed for hydroelectric power generation. The dam's continued operation over more than five decades demonstrates the durability of the concrete gravity design and the effectiveness of the water management strategies employed. The reservoir's ability to store 600,000 m3 of water remains a key factor in the dam's functionality, allowing it to continue playing its vital role in the Dajia River cascade. The integration of the Qingshan Dam with the Techi and Kukuan Dams ensures that the water resources of the Dajia River are utilized to their full potential, providing a reliable source of hydroelectric power for the region.