Overview
The Gudongkou Dam is an operational hydroelectric powerplant located in Xingshan County, Hubei Province, China. It is situated on the Xiangxi River, which serves as a tributary of the Yangtze River. The facility is positioned approximately 64 km north of the Three Gorges Dam, placing it within a significant corridor of energy infrastructure along the Yangtze basin. The dam structure is classified as a concrete-face rock-fill dam, a design choice that leverages local geological resources to create a robust barrier for water management and power generation.
The primary functions of the Gudongkou Dam are flood control and hydroelectric power generation. As a key component of the regional water management strategy, the dam helps regulate the flow of the Xiangxi River, mitigating flood risks for downstream communities and agricultural areas. Simultaneously, the facility contributes to the national energy grid through its hydroelectric output, harnessing the kinetic energy of the river to produce electricity for local and regional consumption.
Construction of the Gudongkou Dam began with preliminary works in 1990. Official construction on both the dam structure and the power station commenced on 1 March 1993. The dam began to impound its reservoir in 1996, marking a critical phase in the project's timeline. The power generation capabilities were brought online in stages, with the three generators being commissioned between 1999 and 2000. The plant has been operational since its initial commissioning in 1999, continuing to serve its dual purpose of flood mitigation and energy production in the Hubei Province region.
Geography and Location
The Gudongkou Dam is situated on the Xiangxi River, a significant tributary of the Yangtze River, within Xingshan County in Hubei Province, China. This location places the hydroelectric facility in a key geographical position relative to the broader Three Gorges reservoir system. The dam is located approximately 64 km (40 mi) north of the Three Gorges Dam, establishing a close hydrological and operational relationship with the larger Yangtze River infrastructure. The Xiangxi River serves as the primary water source for the concrete-face rock-fill structure, which leverages the natural gradient of the tributary for hydroelectric power generation and flood control.
Location Details
| Attribute | Detail |
|---|---|
| Country | China (CN) |
| Province | Hubei |
| County | Xingshan County |
| River | Xiangxi River (tributary of the Yangtze River) |
| Distance to Three Gorges Dam | 64 km (40 mi) north |
The positioning of the Gudongkou Dam on the Xiangxi River allows it to function as an upstream regulator for the Yangtze River basin. Its location in Xingshan County places it within the complex topography of the Hubei Province, where the concrete-face rock-fill design is particularly effective for managing the river's flow and sediment load. The proximity to the Three Gorges Dam, being only 64 km to the north, highlights the strategic placement of the Gudongkou facility within the larger network of Chinese hydroelectric infrastructure. This geographical arrangement supports coordinated flood control measures and power generation across the tributary and main stem of the Yangtze.
Construction History
The construction of the Gudongkou Dam, a concrete-face rock-fill structure on the Xiangxi River in Xingshan County, Hubei Province, China, unfolded over a multi-year timeline spanning from preliminary investigations to final generator commissioning. The project was situated approximately 64 km north of the Three Gorges Dam, serving as a key component of the regional hydroelectric infrastructure along a tributary of the Yangtze River. The development aimed to provide dual benefits of flood control and hydroelectric power generation for the region.
Preliminary and Official Construction Phases
Preliminary construction activities for the Gudongkou Dam commenced in 1990. This initial phase involved essential site preparation, geological surveys, and infrastructure development necessary to support the main structural works. This date marked the formal start of the primary engineering works, transitioning the project from preparatory stages to active structural development.
Reservoir Impoundment and Commissioning
By 1996, the dam structure had reached a sufficient height and integrity to begin impounding the reservoir. This milestone allowed water to be retained behind the concrete-face rock-fill barrier, creating the storage capacity necessary for both flood mitigation and power generation. The impoundment process was a critical operational test for the dam's structural performance and the efficiency of the water intake systems.
The final phase of the construction history involved the commissioning of the hydroelectric generators. The power station features three generators, which were commissioned sequentially between 1999 and 2000. The first generator became operational in 1999, marking the official start of electricity production from the facility. The remaining two generators followed in 2000, completing the installed capacity of the power station. This staggered commissioning allowed for operational testing and integration into the local grid before the full capacity was brought online. The completion of these phases established the Gudongkou Dam as an operational hydroelectric powerplant, contributing to the energy mix of Hubei Province.
Technical Specifications and Design
The Gudongkou Dam is engineered as a concrete-face rock-fill dam, a structural design chosen for its efficiency in harnessing the hydraulic head of the Xiangxi River. This construction method involves a core of compacted rock fill, which provides bulk and stability, faced with a thin layer of concrete that serves as the primary water-tight seal. Located in Xingshan County, Hubei Province, this design allows the structure to manage the significant water pressures associated with its position on a major tributary of the Yangtze River. The dam’s strategic placement, approximately 64 km north of the Three Gorges Dam, integrates it into the broader regional hydroelectric and flood control infrastructure of the Yangtze basin.
Hydroelectric Generation Infrastructure
The power station component of the Gudongkou complex is equipped with three generators. These units were commissioned sequentially between 1999 and 2000, marking the transition of the facility from preliminary construction to full operational status. The commissioning timeline followed the initial impoundment of the reservoir, which began in 1996, allowing the water levels to stabilize sufficiently to drive the turbine-generator sets effectively. The installation of these three generators represents the core of the plant’s capacity to convert the kinetic energy of the Xiangxi River into electrical power, contributing to the regional grid.
Capacity Data and Source Limitations
While the operational timeline and structural type are well-documented, specific quantitative data regarding the installed electrical capacity of the three generators is notably sparse in the primary cited sources. The available grounding information confirms the existence and commissioning years of the units but does not provide explicit megawatt (MW) ratings for individual turbines or a total aggregated capacity figure for the power station. Consequently, precise technical specifications such as the exact output in megawatts or gigawatt-hours per annum must be inferred or sought from specialized engineering reports beyond the current scope. The lack of explicit capacity figures in the primary reference material highlights a gap in the commonly available public data for this specific hydroelectric facility, distinguishing it from larger, more extensively documented dams in the immediate vicinity.
Why it matters
The Gudongkou Dam holds a distinct strategic position within the complex hydroelectric infrastructure of the Yangtze River basin. Located in Xingshan County, Hubei Province, the facility is situated on the Xiangxi River, which serves as a key tributary to the main stem of the Yangtze. Its operational significance is closely tied to its geographical proximity to the region’s most prominent hydraulic engineering project. The dam is located about 64 km (40 mi) north of the Three Gorges Dam, establishing it as an upstream component in the broader river system management strategy. This positioning allows the Gudongkou reservoir to influence water flow and sediment dynamics before they reach the larger Three Gorges reservoir, contributing to the coordinated flood control and power generation efforts across the basin.
Infrastructure Role and Function
The facility began impounding its reservoir in 1996, with its three generators commissioned between 1999 and 2000. This operational timeline places the dam’s initial power output in the late 1990s, a period of significant expansion for China’s hydroelectric capacity. The concrete-face rock-fill construction type is a notable engineering choice for the site. This dam type involves a rock-fill core faced with a concrete slab, offering flexibility and durability suitable for the geological conditions of the Xiangxi River valley. The successful commissioning of the three generators marked the culmination of a construction phase that saw preliminary work start in 1990 and official construction on the dam and power station begin on 1 March 1993.
Regional Context in Hubei Province
Within Hubei Province, the Gudongkou Dam represents an important node in the regional energy grid, complementing the massive scale of the Three Gorges project. While the Three Gorges Dam dominates discussions of Yangtze infrastructure, tributary dams like Gudongkou provide critical supplementary capacity and localized flood mitigation. The dam’s location in Xingshan County highlights the utilization of the province’s varied topography for energy production. The integration of the Xiangxi River’s flow into the provincial power supply demonstrates a multi-layered approach to harnessing the Yangtze basin’s hydraulic potential, where both main-stem and tributary resources are developed to maximize efficiency and reliability. The operational status of the dam remains active, continuing to serve its designed roles in flood control and power generation for the region.
What is a concrete-face rock-fill dam?
A concrete-face rock-fill dam (CFRD) is a hybrid structural design that combines the flexibility of a rock-fill core with the impermeability of a concrete slab. This technology differs fundamentally from traditional gravity or arch dams. A gravity dam relies on its massive weight to resist water pressure, typically constructed from solid concrete or earth. An arch dam curves upstream, transferring hydrostatic load to the canyon walls. In contrast, a CFRD uses a central core of compacted rock fill, which acts as the primary load-bearing structure, covered by a thin, upstream-facing concrete slab that serves as the main watertight barrier.
Structural Mechanics and Design
The rock-fill core of a CFRD is composed of angular, interlocking stones compacted to create a stable, flexible mass. This core absorbs and distributes the hydrostatic pressure of the reservoir water more efficiently than a rigid concrete structure. The concrete face, typically 20 to 40 centimeters thick, is placed directly on the upstream slope of the rock fill. This slab is segmented by vertical and horizontal contraction joints to accommodate thermal expansion and settlement. The joints are sealed with waterstops to prevent leakage through the face.
This design offers distinct technical advantages for sites like the Xiangxi River. The flexibility of the rock-fill core allows the dam to settle and deform slightly under load without cracking, a common issue with rigid concrete gravity dams in areas with variable foundation conditions. The concrete face provides a smooth, durable surface that resists erosion from wave action and sediment-laden water, which is critical in tributaries of major river systems like the Yangtze. Additionally, CFRDs often require less cement than conventional concrete dams, reducing material costs and construction time, as the rock fill can be placed and compacted more rapidly than concrete pouring cycles.
Application at Gudongkou
The Gudongkou Dam utilizes this CFRD configuration to manage flood control and hydroelectric generation on the Xiangxi River. The design allows for efficient impoundment of water, as seen when the reservoir began filling in 1996. The structural integrity of the concrete face ensures minimal seepage, maintaining the reservoir level necessary for the operation of the three generators commissioned between 1999 and 2000. The rock-fill core provides the stability required to withstand the hydrostatic loads and potential seismic activity in the Hubei Province region, ensuring long-term operational reliability for the power station.
How does the Gudongkou Dam contribute to flood control?
The Gudongkou Dam functions as a critical infrastructure component for flood control on the Xiangxi River, a significant tributary of the Yangtze River in Hubei Province, China. As a concrete-face rock-fill dam, its primary structural design allows for substantial water retention, directly mitigating downstream flooding risks. The dam’s strategic location, situated approximately 64 km north of the Three Gorges Dam, positions it as an upstream buffer in the broader Yangtze River basin management system.
Reservoir Impoundment and Flow Management
The mechanism for flood control at Gudongkou is fundamentally tied to its reservoir capacity, which began to take shape when impoundment started in 1996. This early phase of water retention, occurring several years before the full commissioning of its power generators, established the initial storage volume necessary to absorb peak flows from the Xiangxi River. By capturing excess runoff during heavy rainfall events, the dam reduces the immediate hydraulic load on the river channel downstream. The concrete-face rock-fill construction provides the structural integrity required to maintain this reservoir level under varying hydrostatic pressures, ensuring that the stored water can be released in a controlled manner rather than in sudden, unmanaged surges.
Integration with the Yangtze River System
The Gudongkou Dam does not operate in isolation; its flood control efficacy is enhanced by its proximity and operational synergy with the larger Three Gorges Dam. Located just 64 km north of this major hydropower hub, Gudongkou serves as a preliminary checkpoint for water management. This geographic relationship allows for coordinated release schedules, where Gudongkou can hold back initial flood peaks, thereby smoothing the hydrograph before the water reaches the Three Gorges reservoir. This integration is vital for the Yangtze River basin, where synchronized management of tributaries like the Xiangxi helps prevent compound flooding events that can overwhelm main-channel infrastructure. The dam’s role in flood control is thus both local, protecting Xingshan County and immediate downstream areas, and regional, contributing to the stability of the Yangtze’s flow regime.
Preliminary construction efforts began in 1990, with official works on the dam and power station commencing on 1 March 1993. This timeline reflects the strategic planning involved in aligning the dam’s structural completion with the hydrological needs of the region. The commissioning of its three generators between 1999 and 2000 marked the full operational capability of the facility, enabling dynamic adjustment of water levels for both power generation and flood mitigation. The dual-purpose design ensures that flood control remains a primary function, even as hydroelectric output is optimized, demonstrating the integrated approach to water resource management in Hubei Province.
Frequently asked questions
Where is the Gudongkou Dam located?
The facility is located approximately 64 km (40 mi) north of the Three Gorges Dam. This positioning places it within the broader Yangtze River basin infrastructure network.
What type of dam structure is used?
The Gudongkou Dam is a concrete-face rock-fill dam. This construction method involves a core of rock-fill material faced with a concrete slab to create a watertight barrier. The structure is designed to handle the hydrological conditions of the Xiangxi River while supporting the power generation and flood control functions of the facility.
What are the primary functions of the dam?
The dam serves two main purposes: flood control and hydroelectric power generation. By regulating the flow of the Xiangxi River, the facility helps manage water levels to mitigate flooding in downstream areas. Additionally, the hydroelectric power station generates electricity, contributing to the regional energy supply.
When was the Gudongkou Dam constructed and commissioned?
The dam began to impound its reservoir in 1996. The facility is currently operational.
How does the Gudongkou Dam relate to the Three Gorges Dam?
It is situated on the Xiangxi River, a tributary that feeds into the Yangtze River, which is the main river channel where the Three Gorges Dam is located. This geographical proximity places the Gudongkou Dam within the immediate hydrological influence zone of the larger Three Gorges project.
Summary
The structure is designed as a concrete-face rock-fill dam, a specific engineering configuration that utilizes a rock-fill core faced with a concrete slab to withstand water pressure and sediment load. The primary functions of the Gudongkou Dam are flood control and hydroelectric power generation, contributing to the regional energy infrastructure and water management strategies of the Hubei Province area.
Construction activities for the Gudongkou Dam spanned a significant period, beginning with preliminary work in 1990. The impoundment of the reservoir started in 1996, marking the initial phase of water retention and hydrological adjustment for the surrounding landscape. The official commissioning date for the facility is recorded as 1999, aligning with the start of the generator operational timeline. The dam remains operational, continuing to provide its designated services of flood mitigation and electricity production for the region.
The location of the Gudongkou Dam on the Xiangxi River places it within a critical hydrological zone of the Yangtze River basin. Its proximity to the Three Gorges Dam highlights its role within the broader cascade of hydroelectric developments in the region. The concrete-face rock-fill design was selected to address the specific geological and hydrological conditions of the Xiangxi River site. The project's timeline, from preliminary construction in 1990 to the commissioning of generators in 1999 and 2000, reflects the phased approach typical of major hydroelectric infrastructure projects in China during that era. The dam's operational status as of the current date confirms its continued relevance to the local energy grid and flood control systems.
See also
- Three Gorges Dam collapse controversy
- Environmental flow assessment for improvement of ecological integrity in the Haihe River Basin, China
- Shanghai Petrochemical: Operations, Ownership and Strategic Position
- Xiluodu Dam: Engineering and Operation of China's Arch Dam
- Climate policy of China