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Xiao F.,Guangxi Hydraulic and Electrical Polytechnic | Xiao F.,CAS Chengdu Institute of Mountain Hazards and Environment | Kang Y.,Guangxi Water and Power Design Institute | Huang W.,Guangxi Hydraulic and Electrical Polytechnic
International Conference on Challenges in Environmental Science and Computer Engineering, CESCE 2010 | Year: 2010

Canpopy interception, evapotranspiration, runoff yield and concentration constitute primary hydrologic processes, which mathematic modeling contributes an important way to study hydrologie regularity. Jialingjiang hilly areas is an important ecological barriers and economic zone of Yangtyz river. In this paper, a tipical small watershed-Lizixi basin is selected to simulate main hydrology processes of Jialingjiang hilly small watershed. Results of model show that the model uncertainty factor meets the precision requirements of B and relative error is below 15%, which indicates that the model reflects the actual hydrologic process basically and the model is effective. © 2010 IEEE.

Zhang W.,Wuhan University | Zhang W.,Security Innovation | Liu P.,Wuhan University | Liu P.,Security Innovation | And 11 more authors.
Water Resources Management | Year: 2015

Operations of multi-reservoir systems are nonlinear and high-dimensional problems, which are difficult to find the optimal or near-optimal solution owing to the heavy computation burden. This study focuses on flood control operation of multi-reservoir systems considering time-lags caused by Muskingum flood routing of river channels. An optimal model is established to jointly minimize the flood peak on the downstream flood control station for the multi-reservoir systems. A hybrid algorithm, Progressive Optimality Algorithm and Successive Approximation (POA-SA), is improved to solve the multi-reservoir operation model by modifying the POA. The POA-SA uses the DPSA to reduce the spatial dimensionality due to the multiple reservoirs, and adopts an improved POA to alleviate the temporal dimensionality caused by the time-lags of the Muskingum flood routing. Linear programming is then implemented to verify the solution of the POA-SA method with a linear approximation of the discharge capacity curve. The multi-reservoir systems of China’s Xijiang River is selected for a case study. Results show that the flood peak of Wuzhou station can be averagely decreased by 6730 m3/s (12.8 %) for the 100-year return period floods, indicating that the proposed method is efficient to operate the multi-reservoir systems and resolve the time-lags issues. © 2015 Springer Science+Business Media Dordrecht

Gan W.,Hefei University of Technology | Gan W.,Guangxi Water and Power Design Institute | Zhu D.,Hefei University of Technology | Wu Y.,Hefei University of Technology | And 5 more authors.
Sichuan Daxue Xuebao (Gongcheng Kexue Ban)/Journal of Sichuan University (Engineering Science Edition) | Year: 2014

In order to study the strength characteristics of red sandstone fine-grained soils and the effects of moisture content and degree of compaction on shear strength, quick shear tests were carried out under different moisture contents and degrees of compaction. The results showed that under a certain degree of compaction, the cohesive strength which showed a quadratic parabola relationship with moisture content was increased first and then decreased with the increase of moisture content, while the internal friction angle was decreased with power-function. The saturated cohesive strength and internal friction angle showed different amplitude increase with the degree of compaction under a certain moisture content. Compared with internal friction angle, the cohesive strength was affected more significant by moisture content and the degree of compaction. The present results can provide references to the red sandstone roadbed or dam construction engineering and slope stability analysis etc.

Liu S.-Q.,Hefei University of Technology | Liu S.-Q.,China Jikan Research Institute of Engineering Investigations and Design Co. | Lu K.-L.,Hefei University of Technology | Zhu D.-Y.,Hefei University of Technology | And 3 more authors.
Yantu Lixue/Rock and Soil Mechanics | Year: 2015

The ultimate bearing capacity of a strip footing on the reinforced sand is studied based on both the limit equilibrium slice method and the critical slip field method. It is assumed that friction of the interface between the soil and reinforcements is uniform when the reinforced foundation soil is in the limit equilibrium state. Based on the limit equilibrium equations of soil slice, a recursion expression of slice force is derived. Firstly, the borders of the soil mass with potential sliding are determined, then soil mass is divided into a series of slices, and the state points is distributed on interfaces between the slices. Secondly, the recursion expression is used to calculate the parameters of all state points and search the critical slip surface. Finally, the bearing capacity can be determined according to the critical slip surface which meets the balance of forces and moments. The reliability of calculation results is shown by comparing with the results in literature. Effects of distance from footing bottom to top reinforcement, layer numbers and length of reinforcement on bearing capacity and slip surface are also presented. The results show that the bearing capacity increases firstly and then decreases as the depth increases, or it increases firstly and becomes stable lastly as layer number and length increase. It is also shown that the slip surface changes mainly in the vertical and horizontal ranges. Because the proposed method is easy to understand and numerically implement, it provides a new idea to calculate the bearing capacity of strip footing on reinforced sand, and it extends the critical slip field method to the calculation of bearing capacity. ©, 2015, Academia Sinica. All right reserved.

Chen S.,China Three Gorges University | Chen X.,China Three Gorges University | Luo Z.,China Three Gorges University | Cai D.,China Three Gorges University | Cai D.,Guangxi Water and Power Design Institute
MATEC Web of Conferences | Year: 2016

Based on spectral reflection characteristics of chirped FBGs, a demodulation method for complex temperature fields is proposed in this paper. Relationships between the reflective spectrums and the temperatures are investigated through theoretical analyses. Testing results are acquired from a FBG sensing model which is designed according to the newly-developed method. A simulation to get the relationships between reflective spectrums and temperatures is set which shows that this demodulation method is feasible and its demodulation precision is beyond +/-1°C. The method provides a new method for analyzing complex temperature fields. © 2016 The Authors, published by EDP Sciences.

Qin G.,University of Sichuan | Li H.,University of Sichuan | Zhou Z.,Guangxi Water and Power Design Institute | Song K.,University of Sichuan | Zhang L.,Florida Gulf Coast University
Advances in Meteorology | Year: 2015

Hydrological time series data (1988-2008) of the Hei River, the main water source to Zoige wetland in the Eastern Tibetan Plateau, were investigated. Results showed that the runoff distribution of Hei River varies with the relative change in amplitude (Cm = 15.9) and the absolute change in amplitude (Δ Q = 37.1 m3/s) during the year. There was a significant decreasing trend since 1988 with annual runoff of 20.0 m3/s (1988-1994), 19.0 m3/s (1995-2000), and 15.2 m3/s (2001-2008). There were double peaks in runoff during the water year: the highest peak in the period of 1988-2000 occurred in July while in the period of 2001-2008 it occurred in October. Shifting peak flow means less water quantity in wetland during growing season. Nearest neighbor bootstrapping regressive method was used to predict daily runoff of the Hei River. Model results show that it was fitted with 94.23% of R 2 for daily time series, which can provide a basis for the development and utilization of regional water resources. © 2015 Guanghua Qin et al.

Wei S.,Hefei University of Technology | Wei S.,Chongqing Jiaotong University | Zhang Q.,Hefei University of Technology | Liu J.,Hefei University of Technology | And 2 more authors.
Advanced Materials Research | Year: 2012

The general soft soil widely exists in coastal, riverside and lakeside areas. Large area along the Yangtze River in Anhui Province is also the distribution of soft soil. The existence of soft soil has some degree effect on the project construction. According to the laboratory tests, the basic properties of the soft soil in these areas were researched. Based on test results, and compared with the soft soil of other areas, results show that the soft soil of Anhui along the Yangtze River has its own special nature. It include that, compared with other areas soft soil, the soil void ratio and compression coefficient are a little smaller; the consolidation coefficient, permeability coefficient and shear strength parameters are a little bigger; the silt content is above normal. The results and further understanding of soft soil basic nature may have certain guiding significance to construction projects along the Yangtze River region. © (2012) Trans Tech Publications, Switzerland.

Zhang Y.,Wuhan University | Xiao C.,Changjiang Water Resource Protection Institute | Ye M.,Changjiang Water Resource Protection Institute | Tang J.,Guangxi Water and Power Design Institute
Advances in Intelligent and Soft Computing | Year: 2011

This study develops and applies a distributed urban runoff pollution model to the north Moshui lake area of Wuhan for evaluating its non-point source pollution. Based on the research of the urban land utilization and land surface features using GIS, the characteristics of runoff flow, solid suspend (SS) and chemical oxygen demand (COD) on the inlets have been analyzed according the model, the initial pollution loads and the total pollution loads are computed in this study. The results show that the peak of pollutant concentrations are lagged with the peak of rainfall; and the pollutants in initial rainwater are the key part of all pollutants, which often account for 90% proportion. © 2011 Springer-Verlag Berlin Heidelberg.

Feng J.-J.,University of Sichuan | Li R.,University of Sichuan | Tang C.-Y.,Guangxi Water and Power Design Institute | Yong X.-D.,University of Sichuan
Shuikexue Jinzhan/Advances in Water Science | Year: 2012

During its transportation over long distances, supersaturated Total Dissolved Gas (TDG) may lead to gas bubble disease or even heightened fish mortality. Because the sediment concentration is always high in spill flow in China, studying the releasing law of supersaturated TDG in sandy water is of great theoretical and practical value. In the experiment described in this paper, we designed three kinds of experimental conditions, including a static water column, stir-induced turbulent water and an open channel flow. For each experimental condition, the TDG release processes were monitored both in fresh water and sandy water. The dissipation coefficients were calculated and compared under different sedimentation levels. The results indicate that both sediment and turbulence intensity can increase the release speed of TDG. The higher the sediment concentration level and turbulence intensity are, the greater the dissipation coefficients are. This study can provide important guidance for determining dissipation coefficients in a TDG simulation model, and can serve as a reference in exploring mitigation measures of supersaturated TDG.

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