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Fang H.,Tsinghua University | He G.,Tsinghua University | Han D.,Hydro China Corporation | Duan J.,China Institute of Water Resources and Hydropower Research | And 2 more authors.
Science China Technological Sciences | Year: 2014

Since the filling of the reservoir of the Three Gorges Project (TGP) dam in the Yangtze River in 2003, erosion downstream from the dam site has affected the finless porpoise's habitat. In this study, a one-dimensional (1D) fluvial process mathematical model is used to calculate flow and sediment transport in the middle and lower reaches of the Yangtze River, including the finless porpoise's habitat. By analyzing the calculation results for the water resources, suspended load, and bed materials in the finless porpoise's habitat after the riverbed deformation, we evaluated the possible impact on this rare Yangtze River aquatic animal. The results show that, with the erosion of riverbed over the next 20 years, the water quantity comprising the habitat will decrease to half of its present amount, and the bed materials will be eroded to coarse grading, such that the reserve will become a gradually disappearing stream. Effective engineering measures should be used to decrease the erosion in the main channel, in case the overall erosion cannot be stemmed and controlled, to ensure an adequate water volume flows into the finless porpoise's habitat. © 2014 Science China Press and Springer-Verlag Berlin Heidelberg.


Fang H.,Tsinghua University | Han D.,Hydrochina Corporation | He G.,Tsinghua University | Chen M.,China Agricultural University
Journal of Hydrology | Year: 2012

After the Yangtze River was closed by the Three Gorges Project (TGP) in 2003, erosion occurred from the dam site to the river mouth, especially in the middle and lower reaches of the Yangtze River. However, in some local areas of Chenglingji reach which holds the key position for flood management, there is actually deposition in contrast to the expected erosion. In this paper, a one dimensional mathematical model of the river network with sediment transport is used as the tool to simulate flow and fluvial processes. The calculation domain is from Yichang, which is downstream of the dam, to Hankou, the controlling node of flood management, 694. km long in total. The model is calibrated based on the field data of hydrology and sediment transport during the period from October 2003 to October 2008. Then the model is utilized to simulate the erosion and deposition of the middle and lower reaches of the Yangtze River in the next two decades, and produce the results of a new river channel after river bed deformation occurs. The typical flood processes of 1954 and 1998 in the Yangtze River basin are used to check the flood management scheme for the research area, and results show that water storage of Three Gorges Reservoir (TGR) and a flood diversion program downstream of the Yangtze River should be taken into consideration. © 2012 Elsevier B.V.


Zhu S.,Hohai University | Shi G.,Hohai University | Zhou J.,HydroChina Corporation
Yanshilixue Yu Gongcheng Xuebao/Chinese Journal of Rock Mechanics and Engineering | Year: 2011

Some damage phenomena appear in Bikou earth core dam after "5.12" Wenchuan earthquake. With the bedrock motions at Wenxian seismic station (062WIX), the input acceleration time-history is obtained from the relationship of free-field peak ground acceleration (PGA) and fault distance in Wenchuan earthquake. The dynamic parameters of dam soils are determined by comparing with the information of large-scaled laboratory triaxial experiments of other projects based on their physical and mechanical characteristics. Based on TSDA program for three-dimensional finite element dynamic analysis, the permanent deformation and the pore water pressure of core dam are close to the recorded data; the maximum acceleration along the dam axis is scaled up in amplitude only by a factor of 2.36 at the dam crest, and the dynamic response of cut-off walls is also weak. Because Bikou dam is located on the hanging wall of fault, and high-frequency componet of the bedrock motions had developed, although the earthquake lasted much longer, the dynamic response is weaker than that under the standard seismic waves synthesized by design response spectrum according to "Specifications for seismic design of hydraulic structures". From the results of seismic review, it could be found that the core dam built by the modern technology of heavy vibration has good seismic behavior; and the current seismic theories and methods for earth dam are basically feasible.


News Article | January 13, 2016
Site: www.reuters.com

A flooded embankment along the Ganges river is seen in this aerial view taken from an Indian Air Force (IAF) helicopter in the Cyclone-hit area of Patharpatima Island in the Sundarbans delta, about 100 km (62 miles) south from the eastern Indian city of Kolkata, May 27,... Men push their bicycles through the flooded banks of the river Ganges after heavy rains in Allahabad, India, July 16, 2015. Bangladesh started work on the proposed Ganges Barrage Project during the tenure of the previous ruling Awami League government in the late 1990s. The country has already completed a feasibility study and the design for the proposed 2.1 kilometer-long dam, due to be constructed at Pangsha in Rajbari district, about 100 km downstream from the Farakka Barrage in India’s West Bengal state. The Ganges, known as the Padma River in Bangladesh, is one of the major sources of surface water in the southwest of the country. Water scarcity and water salinity - made worse by climate change - are common problems in the region, which is why Bangladesh has given the barrage project top priority. Experts say salinity is on the rise in the southwest due to sea-level rise from global warning. The proposed dam would release water through river channels to help dilute the salt levels. However, experts say it will be difficult to push forward with the project in the absence of support from India. New Delhi sent a letter to the Bangladesh government in early 2015 saying Indian technical experts had evaluated project documents sent by Dhaka and were concerned the dam could cause flooding in India. The Ganges flows out of India on flat terrain from West Bengal. India in the letter predicted that even a slight increase in the river’s water level would cause huge submergence in areas of India bordering Bangladesh. New Delhi asked Dhaka to send the full feasibility study, including scientific modeling, so it could be sure there would be no increase in water levels on Indian territory. Bangladesh Water Resources Minister Anisul Islam Mahmud told the Thomson Reuters Foundation all the documents requested by India were sent last April, but New Delhi had yet to respond. During a visit to India in November, Mahmud met his Indian counterpart, Uma Bharati, who assured him of a response soon. It will be a hard task for Bangladesh to implement the large dam alone, which is why it has sought cooperation from India, experts say. The two countries are currently locked in a range of political squabbles over water, including over how to share the waters of the Teesta, another cross-boundary river. “India may halt the (Ganges) project, showing technical issues that it (says) will pose adverse impacts on Indian territory – which is why Bangladesh has sought cooperation from India” on the project, said Delwar Hossain, an international relations professor at Dhaka University. However, any project in a downstream country such as Bangladesh has little possibility to cause harm to upstream countries, Hossain said. He said Bangladesh should push ahead to quickly answer any technical questions India raises. At a meeting with the outgoing Indian High Commissioner to Bangladesh in October, Bangladeshi Prime Minister Sheikh Hasina emphasized the importance of engaging India in the dam project. According to the feasibility study, around $4 billion will be required to implement the project over a seven-year period, but the government has yet to find the funds. Minister Mahmud said the cost of the barrage project would be recovered within five years through increased agricultural and fish production in the Ganges-dependent area, as well as the 113 megawatts of hydropower the project is expected to generate. A Chinese firm, Hydrochina Corporation, has expressed interest in building the dam, and has already held several meetings with Bangladesh’s Water Resources Ministry to discuss financing for the project. According to Hydrochina Corporation officials, the Chinese government is willing to provide $20 billion in concessional loans to South Asian nations over the next five years. “We are keen to implement the proposed Ganges Barrage Project. Funding could be managed with government-to-government negotiations,” said Zhao Yang, business development manager for Hydrochina Corporation. The Ganges Barrage would create a reservoir 165 km long, covering 62,500 hectares and with a capacity of some 2.9 billion cubic liters of water. According to the minister, the water would be diverted to 26 districts through 123 regional rivers. Building the dam would alleviate water shortages and contamination of water supplies in southwest Bangladesh, experts say. The reservoir’s water would be used throughout the year, regulated by water control structures on rivers, to meet demand for irrigation, fisheries, navigation and salinity control. Acting project director Rowshan Ali Khan said the release of water from the reservoir through the Ganges basin river system would help manage siltation problems in river channels and facilitate drainage. It would also preserve biodiversity and forest resources in the Sundarbans, the world’s largest mangrove forest, he added.


Fu Z.N.,hydrochina corporation | Xie H.W.,No.2 Beixiaojie Liupukang Dewai
Applied Mechanics and Materials | Year: 2014

Wind speed forecasting plays a significant role to the operation of wind power plants and power systems. An accurate forecasting on wind power can effectively relieve or avoid the negative impact of wind power plants on power systems and enhance the competition of wind power plants in electric power market. Based on a fuzzy neural network (FNN), a method of wind speed forecasting is presented in this paper. By mining historical data as the learning stylebook, the fuzzy neural network (FNN) forecasts the wind speed. The simulation results show that this method can improve the accuracy of wind speed forecasting effectively. © (2014) Trans Tech Publications, Switzerland.


Pan Y.,Wuhan University | Pan Y.,Southern Research Institute | He Y.-L.,Wuhan University | Zhou X.-X.,HydroChina Corporation | Cao X.-X.,Wuhan University
Yantu Lixue/Rock and Soil Mechanics | Year: 2013

In order to research the effect of the canyon terrain on the stress and displacement of cutoff wall in dam foundation with deep overburden, taking an asphalt concrete core rockfill dam project as a background, a narrow canyon and a broad canyon were simulated and corresponding finite element models were also established respectively. The filling materials of dam and overburden were simulated by the Duncan-Chang E-B model. The interface without thickness was used to simulate the contact relation between the cutoff wall, overburden and bedrock. A 3-D nonlinear finite element calculation was carried out to analyze the stress and displacement of cutoff wall in different canyon terrains. Results indicate that vertical deformation and horizontal displacement of cutoff wall, as well as unequal settlement between cutoff wall and overburden in narrow canyon are less than that in a broad one; the maximum unequal settlement reduced 24.8%. The cutoff wall is less restrained by the broad canyon than that in a narrow one; thus the vertical stress in the broad canyon is greater and increases by 40.3% utmost. The position of the maximum vertical stress of cutoff wall is affected both by the position of neutral point and canyon terrain. The maximum vertical stress is approximately 30% by the weight of embankment and 70% by negative skin friction. The studied results can provide a reference for the design of cutoff wall in dam foundation in different canyon terrains.


Li M.,Tianjin University | Liu J.,Water Transportation Consultants Co. | Liu J.,Tianjin University | Liu F.,Tianjin University | Wang Z.,Hydrochina Corporation
Journal of Geotechnical and Geoenvironmental Engineering | Year: 2013

Rock mass structures are key factors that control and influence the stability of foundation engineering, underground engineering, and slope engineering. Based on the traditional plane block theory, a new approach of three-dimensional (3D) surface block identification and analysis is put forward. The 3D rock mass model integrated geological structures with stochastic rock structural network planes were first built according to the given mathematical definition of surface blocks. Then, subject to the four principles of closure, completeness, uniqueness, and validity, the proposed method can search, identify, and analyze key free blocks and constraint blocks. This approach was applied to study the rock blocks of a developed hydropower project and offers a new measure for rock mass stability analysis and control. © 2013 American Society of Civil Engineers.


Gao J.,HYDROCHINA Corporation | Gao J.,HYDROCHINA Engineering Consulting Corporation
Advanced Materials Research | Year: 2013

Snow melting is an important process of snow hydrology. A process-based energy balance snowmelt model: Snow Column Model is developed to reveal the processes of energy conservation, phase change, mass transfer, compaction and growth of grain size. It could provide the information of snow density, temperature and liquid water held in snow packs varied with snowmelt processes. The observations during April and June, 1996 of snowpit in Niwot Ridge, Colorado, Front Range of Rocky Mountains are used to calculate and compare. The calculated ones are consistent with the observed. The model not only demonstrates the processes happened inside snow pack, but also will offer a better understanding of the response of snow pack to climate change in further studies. © (2013) Trans Tech Publications, Switzerland.


Gao J.,HYDROCHINA Corporation | Gao J.,HYDROCHINA Engineering Consulting Corporation
Advanced Materials Research | Year: 2014

Contrasts between TRMM 3B43 monthly data and rainfall observations of 720 stations in China are conducted based on a linear regression model. During January 1999 and December 2007, there is a significant correlation between TRMM data and the observed ones with an average r2 0.834. TRMM data performs better in the South and North, especially for flat regions. Limited by radar signal degradation due to heavy rain and low resolution of monitoring, TRMM data have better results in low-flow season than that in flood season. TRMM data cover all the places in middle and low latitudes. It is useful for long-term water resources planning, drought analysis in ungauged basins (PUB), and will be helpful for flood warning. Spatiotemporal data with higher resolution will greatly promote the development of hydrology in the future. © (2014) Trans Tech Publications, Switzerland.


Zhou J.,HydroChina Corporation
Shuili Fadian Xuebao/Journal of Hydroelectric Engineering | Year: 2014

As the largest developing country, China has been under great pressure of harnessing nature resources to meet its ever-growing demand for energy. China's energy relies mainly on coal. This paper gives a brief introduction to the basic conditions and present development status of water potentials in China, indicates that reservoirs and dams are playing an important role in power supply and optimization of energy structure and economic and social development, and the Paper also points out that the future prospects and challenges of hydropower development in China. Copyright.

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