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	1. Modeling Dependence in Hydrological Frequency Analysis using Copula
	XU Yueping,TONG Yangbin,XU Xiao
	Hydraulic Engineering 29 December 2011
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	Abstract:Although the importance of multivariate analysis has already been recognized, dependences among different variables are often ignored due to the complexity of problem. It is known that doing so may induce great modeling risk that potentially exist, and will jeopardize the successive hydrosystem analysis, design and management. In this paper, the copula approach is proposed to model the dependence among rainfall data of different durations. Several well-known copulas are chosen and compared, among which the Gaussian copula is found to be the best one. In the meanwhile, rainfall data is simulated using the copula approach and it is found out that the simulated rainfall data preserve quite well the statistical characteristics of actual data.
	TO cite this article:XU Yueping,TONG Yangbin,XU Xiao. Modeling Dependence in Hydrological Frequency Analysis using Copula[OL].[29 December 2011] http://en.paper.edu.cn/en_releasepaper/content/4457093


	2. Uncertainty Analysis of Design Flood Estimation in Ungauged Basins
	TONG Yangbin,XU Yueping,XU Xiao
	Hydraulic Engineering 22 December 2011
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	Abstract:This paper focused on analyzing different sources of uncertainties in design flood estimation. First, in the analysis of methodology uncertainty, Regional Synthetic Method (RSM) and L-moments Method (LMM) were used to calculate design rainfall depths, thus to estimate design flood. Also, three simple 24-hour-hyetographs were considered, with peak rainfalls at different times. Second, a Monte Carlo simulation based on Latin Hypercube Sampling (LHS) was employed to estimate the input and parameter uncertainty. A small ungauged basin in Zhejiang Province was used as an example. Results showed that for return periods more than 10 years, the peak flows derived through RSM were larger than that through LMM, indicating that RSM was more conservative and contained more uncertainties. Besides, small change of peak flows for different hyetographs could also be observed. With regard to input and parameter uncertainty, the model was run 1000 times and it was found that the peak flow distribution could be represented by the normal distribution. The statistical characters of simulated peak flow also presented that as the return periods increased, the coefficient of variation grew, slowly though, indicating increased uncertainty.
	TO cite this article:TONG Yangbin,XU Yueping,XU Xiao. Uncertainty Analysis of Design Flood Estimation in Ungauged Basins[OL].[22 December 2011] http://en.paper.edu.cn/en_releasepaper/content/4457090


	3. Uncertainty Analysis of Xinanjiang Model using the Monte Carlo analysis toolbox
	Fathelrahman Ali Mohammed,Qinbo Chen ,Nabela Hamed
	Hydraulic Engineering 22 March 2010
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	Abstract:The consideration of uncertainty in the modeling of hydrological and environmental systems are of increasing importance, and are sometimes even demanded by decision makers. At the same time, the growing complexity of models to represent real-world systems makes it more and more difficult to understand model behavior, sensitivities and uncertainties. The Monte Carlo Analysis Toolbox (MCAT) is a Matlab library of visual and numerical analysis tools for the evaluation of hydrological models. Input to the MCAT is the result of a Monte Carlo or population evolution based sampling of the parameter space of the model structure under investigation. The MCAT can be used off-line, i.e. it does not have to be connected to the evaluated model, and can thus be used for any model for which an appropriate sampling can be performed. The MCAT contains tools for the evaluation of performance, identifiability, sensitivity, predictive uncertainty and also allows for the testing of hypotheses with respect to the model structure used. And in this paper we used MACT to check and know which parameters is very sensitive in Xinanjiang model and six years of daily streamflow, precipitation, and potential evapotranspiration data from the Xingfeng Watershed located in south of china have been used
	TO cite this article:Fathelrahman Ali Mohammed,Qinbo Chen ,Nabela Hamed. Uncertainty Analysis of Xinanjiang Model using the Monte Carlo analysis toolbox[OL].[22 March 2010] http://en.paper.edu.cn/en_releasepaper/content/40971


	4. Modeling Atrazine Sorption and Degradation in Soil Columns
	JohnLeju Celestino Ladu,Thomas Oromo Henry,Olache Oloyeblo Jame,Mohmed Abdallah Mohmed Abdalhi,Mohamed Mokhtar,Adam Ishag Ibrahim
	Hydraulic Engineering 09 December 2009
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	Abstract:Atrazine is relatively mobile in soil-water system and it associates with a variety of soil components such as organic matter. Our present study focuses on atrazine sorption and degradation in soil column. Batch experiments and soil column experiments were thoroughly studied. To obtain sorption and degradation parameters, batch experiment were done with great amount of few soil samples. The measured breakthrough curves from columns were fitted with CXTFIT model to get sorption and degradation parameters. The study confirms that Atrazine application in soils may cause detrimental effect to groundwater due to its high mobility and long persistence in soil. From the experiment carried out, the means of values got from batch equilibrium experiment were slightly related to obtained sorption parameters, whereas degradation experiments were lower than those obtain from column experiments. The present experiment is useful for assessing the behavior of atrazine herbicide with soil and the important of analytical or numerical simulation models to predict the pesticides behavior in soil and its interaction with soil components such as organic
	TO cite this article:JohnLeju Celestino Ladu,Thomas Oromo Henry,Olache Oloyeblo Jame, et al. Modeling Atrazine Sorption and Degradation in Soil Columns[OL].[ 9 December 2009] http://en.paper.edu.cn/en_releasepaper/content/37379


	5. Investigations of Turbulent Wakes Past a Circular Cylinder
	Jiang Chunbo,Yang Chen
	Hydraulic Engineering 20 May 2008
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	Abstract:Turbulent wakes past a circular cylinder are investigated by using both the numerical model and the digital Particle Image Velocimetry (PIV) technique. The fractional step finite element scheme is extended to simulate the turbulent wakes, it has good accuracy and stability properties, and is suitable for convection dominated flows in the wake region. The emphasize is put on simulating the unsteady vortex shedding processes and the saddle position, which are important for understanding the mechanism of the turbulent wakes. The time mean velocity properties are obtained, which show the recirculation region and the similarity characteristics are exist in the near region of the turbulent wakes. The numerical results are compared with the PIV measurements.
	TO cite this article:Jiang Chunbo,Yang Chen. Investigations of Turbulent Wakes Past a Circular Cylinder [OL].[20 May 2008] http://en.paper.edu.cn/en_releasepaper/content/21580

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