Fang H.,Tsinghua University |
He G.,Tsinghua University |
Han D.,HYDROCHINA 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.
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.
Zhou X.-W.,North China Electrical Power University |
Zhou X.-W.,HYDROCHINA Corporation |
Wang L.-P.,North China Electrical Power University |
Zheng B.-H.,Chinese Research Academy of Environmental Sciences
Shuili Xuebao/Journal of Hydraulic Engineering | Year: 2011
Referring to the pressure-state-response (PSR) indicator structure model developed by the OECD and UNEP, the ecosystem health assessment for the Changjiang Estuary was carried out. The assessment index system involved 22 indicators, such as annual run-off fluctuation rate, annual sediment fluctuation rate, CODMn of sea surface, DO over standard rate, COD over standard rate, DIN over standard rate, DIP over standard rate, benthic diversity index, zooplankton copepods density ratio, and phytoplankton species of algae and fecal coliforms over the standard rates, etc. Five levels of assessment criteria were suggested. The ecosystem health status and developing trend of the Changjiang River estuary and its adjacent sea area were analyzed by using the FAME model which is established based on maximum entropy. The results show that the ecosystem is in the sub-healthy state.
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.
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.