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1. Estimation of Evaporation using Penman Open Water Evaporation Equation (Comparative study) | |||
Fathelrahman Ali Mohammed ,Adam Ishag Ibrahim ,Mohamed Abd Allah | |||
Hydraulic Engineering 07 April 2010 | |||
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Abstract:This paper estimate Evaporation ( E0) using the Penman Open Water Evaporation formula and comparing the result with the observed Evaporation for daily meteorological data from xianfeng basin , In this paper the excel program is used to calculate the penman open water evaporation and the daily meteorological weather data recorded for one year ( 2008) were used to obtain the result. The study detects that penman the penman open water evaporation is the best method to estimate (E0). | |||
TO cite this article:Fathelrahman Ali Mohammed ,Adam Ishag Ibrahim ,Mohamed Abd Allah . Estimation of Evaporation using Penman Open Water Evaporation Equation (Comparative study) [OL].[ 7 April 2010] http://en.paper.edu.cn/en_releasepaper/content/41618 |
2. Groundwater level Simulation and forecasting using ANN at Wadi –Nyala watershed, Darfur Sudan | |||
Mohammed Mokhtar Eisa,Thomas Oromo,Adam Ishag,John Leju,Nahla Mustafa,Nabela Hamed | |||
Hydraulic Engineering 30 March 2010 | |||
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Abstract:A proper design of the architecture of Artificial Neural Network (ANN) models can provide a robust tool in water resources modeling and forecasting. The performance of neural networks in a groundwater level forecasting is examined in order to identify an optimal ANN architecture that can simulate the decreasing trend of the groundwater level and provide acceptable predictions up to 17 months ahead. Wadi –Nyala watershed in the south Darfur Nyala, Sudan. Was chosen as the study area as its groundwater resources have being overexploited during the last twenty years and the groundwater level has been decreasing steadily. The model efficiency and accuracy were measured based on the root mean square error (RMSE) and regression coefficient ( ). The model provided the best fit and the predicted trend followed the observed data closely (RMSE = 0.445 and = 0.973). Thus, for precise and accurate groundwater level simulation, ANN appears to be a promising tool. | |||
TO cite this article:Mohammed Mokhtar Eisa,Thomas Oromo,Adam Ishag, et al. Groundwater level Simulation and forecasting using ANN at Wadi –Nyala watershed, Darfur Sudan[OL].[30 March 2010] http://en.paper.edu.cn/en_releasepaper/content/41342 |
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. Analysis on Factors Affecting Preferential Flow | |||
John Leju Celestino Ladu,Zhang Wenwen,Xia Lijun | |||
Hydraulic Engineering 08 February 2010 | |||
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Abstract:Preferential flow concept is important because it is related to a variety of subjects such as agricultural applications, urbanization, environmental pollution, and industrial production. Any kind of wastes left on the environment by means of any of these activities rapidly reaches groundwater by flowing through cracks, earthworm holes, plant root channels, openings developed due to the factors such as soil textures and structures. Soil factors such as soil texture and structure and rainfall factors such as amount and intensity of rainfall are important factors which affect the extent of preferential flow and transport. | |||
TO cite this article:John Leju Celestino Ladu,Zhang Wenwen,Xia Lijun. Analysis on Factors Affecting Preferential Flow[OL].[ 8 February 2010] http://en.paper.edu.cn/en_releasepaper/content/40059 |
5. 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 |
6. Small Scale study on Dinoseb Sorption Variability in Batch | |||
John Leju Celestino Ladu,Zhang Danrong,Thomas Oromo Henry ,Adam Ishag | |||
Hydraulic Engineering 04 November 2009 | |||
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Abstract:In this study, Herbicide Dinoseb (2-see-butyl-4, 6-dinotrophenol) was used as the main chemical found in the groundwater of the research area. The major mechanism found to influence the fate of herbicide transport in soil column is sorption and the most famous method in determining sorption property of chemicals in soil column is batch techniques. Sorption of herbicides onto root mass and soil organic matter has practical implications to the movement and distribution of herbicides. Herbicide binding in a soil can be weak or strong depending on the amount of organic matter present and the degree of decomposition of plant residue within the soil. Sorption is influence by some soil properties which can be seen in its spatial variation within soils although some few studies have investigated sorption variation parameters. The study intensively studied batch experiments with Dinoseb and different soil samples. In batch experiment, parameters are analyzed statistically and the relationships between the parameters and soil properties are investigated thoroughly. In the study, Dinoseb sorption parameters reflect spatial variations and distributed in the research area. Freudhch sorption coefficients of Dinoseb have genuine positive correlation with Organic Carbon contents but the relationship between the values and other soil properties, are not crucial. In the study paper, the heterogeneity of OC content accounts to about 90% of variability of Dinoseb. | |||
TO cite this article:John Leju Celestino Ladu,Zhang Danrong,Thomas Oromo Henry , et al. Small Scale study on Dinoseb Sorption Variability in Batch[OL].[ 4 November 2009] http://en.paper.edu.cn/en_releasepaper/content/36407 |
7. Study of dams\ | |||
Zhangping Wei,Han Chang-hai | |||
Hydraulic Engineering 20 October 2009 | |||
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Abstract:The continuous ecosystems of natural rivers are altered by construction of dams, which has several negative impacts on fishes. Those mainly includes: (1) Barrier of fishes migration routes, (2) Changes of hydrological and hydraulic conditions for fishes spawning, (3) Reduction and destruction of habitats, (4) Influences of gas supersaturation, (5) Influences of discharged low-temperature water. This paper summarizes some research achievements home and abroad, and then it offers two kinds of solutions to those problems: One is engineering measure, such as installing environmentally friendly hydropower turbines and building ecological fish passages in hydraulic structures; the other is non-engineering measure, which includes Fishes Nature Reserves, ecological compensation and regulation, artificial propagation and stocking, etc. | |||
TO cite this article:Zhangping Wei,Han Chang-hai. Study of dams\[OL].[20 October 2009] http://en.paper.edu.cn/en_releasepaper/content/35937 |
8. Application of GAs and GIS in Xin’anjiang Model | |||
Song Xiaomeng,Kong Fanzhe | |||
Hydraulic Engineering 16 October 2009 | |||
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Abstract:Generally, in Xin’anjiang model, the basin is divided into a set of sub-basins by Thiessen method so that the spatial distribution of rainfall can be taken account, which the same recession constants of runoff concentration are used in all sub-basins. It can be seen that topography is not taken account. However, it is well known that the runoff concentration behaviors of basin largely depended on topographic characteristic. And also it adopts a traditional method to make parameters calibration and optimization which takes on uncertain factor. The paper make use of GIS to carve up sub-basins and genetic algorithm to make parameters calibration and optimization, and the application results in Dapoling River Basin show that the number of flood with the qualified rate of error of peak-time increased to 100% from 90%, and excellent rate increased to 30% from 20%, and that with relative error of peak of less than 5% increased to 50% from 30%. | |||
TO cite this article:Song Xiaomeng,Kong Fanzhe. Application of GAs and GIS in Xin’anjiang Model[OL].[16 October 2009] http://en.paper.edu.cn/en_releasepaper/content/35876 |
9. Surrogate Modeling in Predicting Fine Sediment transportation along the Dutch Coastal Area | |||
Chu Kai | |||
Hydraulic Engineering 24 July 2009 | |||
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Abstract:The use of both process-based model and data driven model (DDM) in simulating sediment processes have shown to be useful by previous research. However, both approaches have disadvantages. This paper explored several data driven methods to build simple models in predicting SPM based on output from the process-based models. Artificial neural network (ANN) is adopted as surrogate model to predict suspended particulate matter (SPM) concentration in the Southern North Sea. Surrogate model is essentially a simple and fast ‘model of the model’. The simulation by surrogate models is acceptable and simulation time reduces dramatically. Surrogate models are also built with linear regression method which refers to ‘parsimonious model’. Parsimonious model is the simplest feasible model with the fewest possible number of variables It requires less computation time, the simulation is transparent and results are easy to interpret. | |||
TO cite this article:Chu Kai. Surrogate Modeling in Predicting Fine Sediment transportation along the Dutch Coastal Area[OL].[24 July 2009] http://en.paper.edu.cn/en_releasepaper/content/34067 |
10. Risky dam analysis and stability evaluation of reinforcement | |||
Dong Liang | |||
Hydraulic Engineering 17 March 2009 | |||
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Abstract:Shortly after construction of the Shuanghe Arch Dam, substantial perforative cracks emerged, and these cracks would threaten the stabilization of the dam. A three dimensional model was established and the finite element analysis was employed to investigate the formation cause of the cracks. From the stress sensitive analysis in different types of loading case, the results show: The load combination condition of normal water level and temperature drop is most dangerous, and the temperature drop is the main external cause of crack growing. Four policies were applied to reinforce the arch dam: Thickening the dam body between 491.70~525.00m; consolidation grouting in downriver foundation; downriver drainage system; prestressed anchor in downriver slope. The finite element method is used to analyse the displacement, stress and the safety degree of abutment with comparing the reinforced dam to that without reinforcement. The results indicate that the reinforced arch dam is safe and stable. | |||
TO cite this article:Dong Liang. Risky dam analysis and stability evaluation of reinforcement[OL].[17 March 2009] http://en.paper.edu.cn/en_releasepaper/content/30379 |
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