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Li Q.,Hohai University | Bai X.,Tianjin Hydraulic Research Institute | Lu G.,Hohai University | Zou Z.,Changjiang River Scientific Research Institute | Cai T.,Hohai University
Shuili Fadian Xuebao/Journal of Hydroelectric Engineering | Year: 2011

With population increase and economic growth, the flow regime of the Yangtze River has been altered to some extent by human activities, and particularly by dam construction. Dam-induced alterations in the flow regime will unavoidably influence water allocation among different water uses and instream ecological water requirements may not be satisfied. To assess the impacts of the Three Gorges reservoir operation on the downstream minimum instream ecological water requirements, this paper selected this reservoir and the Yichang hydrological station below the reservoir as case study sites. The reservoir outflows of two water storage schemes were simulated using the long-term time series of daily discharge data, and a satisfaction factor for the downstream minimum ecological flow was computed. This work would provide references for the integrated management of the river's water resources and the assessment of dam-induced impacts on the river's ecosystem health. © Copyright.

Li J.,China Agricultural University | Zhao S.,Tianjin Hydraulic Research Institute
Procedia Engineering | Year: 2012

In order to provide some useful lessons to basin water resources management practice, this paper summarized the successful experience of the two modes of basin water resources management in the United States; one is the mode of the bureau of river basin water resources management represented in Tennessee, and the other is the mode of the committee of river basin water resources management represented in Delaware. The result shows that the improvement in legislation and management and coordination capacity and the increase in multi-stakeholder involvement is the key issue in the water resources management. © 2012 Published by Elsevier Ltd.

Chang S.,Tianjin Hydraulic Research Institute | Wu T.,Tianjin Hydraulic Research Institute | Zhao J.,Tianjin University
Chinese Journal of Environmental Engineering | Year: 2016

The purification effects on Beidagang Reservoir water by planting Myriophyllum, Ceratophyllum and Potamogeton labyrinth were studied, according to its current characteristics of single submerged macrophyte and poor water purification capacity. It was indicated that Myriophyllum could provide carriers for aquatic microorganisms, which could help the removal of nitrogen, phosphorus and other nutrients, and also could prevent the resuspension of suspended material and improve the clarity of the water. Purification ability, removal efficiency and the water environment were improved when the submerged groups was planted together. Myriophyllum could be inhibited by planting together whith Ceratophyllum and Potamogeton. MATLAB software was also used for comprehensive analysis, which indicated that the best purification ability could be achieved when Myriophyllum, Ceratophyllum and Potamogeton labyrinth group was planted. It was mean that Ceratophyllum and Potamogeton labyrinth could be introduced to Beidagang Reservoir based on the existing situation, which would be favourable to improve its water ecological environment and self-purification capacity. © 2016, Science Press. All right reserved.

Sheng J.-C.,Hohai University | Bai K.-H.,Hohai University | Yang X.,Hohai University | Zheng Z.-W.,Hohai University | And 3 more authors.
Yantu Lixue/Rock and Soil Mechanics | Year: 2015

For thorough research of the anti-seepage problem in terms of seepage flux and seepage stability due to the geosynthetic clay liner(GCL) defects, the seepage physical test method for the simulation of GCL with defects in dam anti-seepage hydraulic projects is established by means of developing the seepage experimental apparatus consisting of pressure control system and model test system. Factors which affect the joint impermeability of dam soil and GCL with defects are preliminarily discussed according to the seepage test of GCL with different defect conditions. The results show that the hole-defect's size can be more sensitive to the impact of overall permeability of GCL with defects and soil than the defect rate. The main sensitive factors for defect's healing capacity include hole-defect's diameter and GCL specifications (material's own performance). Therefore, two following points should be considered in the projects: (1) the hole-defect's diameter should be less than 0.5 cm in the projects, the ones larger should be repaired; (2) make sure the GCL interface is smooth and flat in case that the local defect rate becomes more than 0.5%. ©, 2015, Academia Sinica. All right reserved.

Zhang J.,Shanghai JiaoTong University | Zhang J.,Tianjin Hydraulic Research Institute | Shen Z.,Shanghai JiaoTong University | Shan W.,Hebei University | And 2 more authors.
Journal of Hazardous Materials | Year: 2011

An inorganic/organic hybrid adsorbent for phosphate adsorption was synthesized by introducing lanthanum (La) onto diamino modified MCM-41. The adsorbent was characterized by XRD, SEM, BET, TGA, and FTIR spectroscopy. A series of batch tests were conducted to investigate the influence of contact time, initial phosphate concentration, pH of the solution, and competitive ions on the phosphate adsorption capacity. The Langmuir and Freundlich models were used to simulate the sorption equilibrium, and the results indicated that the Langmuir model fitted the experiment data better than the Freundlich model. The maximum adsorption capacity calculated from the Langmuir model is 54.3mg/g. For kinetic study, phosphate adsorption followed the pseudo-second-order equation well with a correlation coefficient greater than 0.99. Optimum pH value for the removal of phosphate was between 3.0 and 7.0. The presence of Cl- and NO3 - has neglectable influence on the phosphate adsorption. F-and SO4 2- have negative effects on the adsorption of phosphate. Phosphate on the spent adsorbent can be almost released by 0.01M NaOH solution in 12min. © 2010 Elsevier B.V.

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