With the name of ALLAH the most merciful السالم عليكم. Peace be upon you all

Transcription

1 بسم هللا الرحمن الرحيم With the name of ALLAH the most merciful السالم عليكم Peace be upon you all 1

2 Urban Water Management and Water Demand Management May 16-20, 2014 Antalya, Turkey Water Purification Plants Intakes Ashraf M. Elmoustafa Ph.D., IH Department, Faculty of Engineering, Ain Shams University (ASU) Cairo, Egypt

3 Management of Water Supply Starts Before The Intake Intake with problems means; Insufficient operation Inadequate supply rates Complaining customers Reduction in operating pump flow = less efficiency = loss in power So you need to be prepared before the problem occurs. (Risk reduction)

4 INTAKE PROBLEMS SCREEN BLOCKAGE Intakes Problems Screen Blockage

5 INTAKE PROBLEMS SEDIMENTATION Intakes Problems Sedimentation

6 SITE DESCRIPTION & PROBLEM IDENTIFICATION Case Study Intake along River Nile Site Description & Problem Identification River morphology and DS Barrage Creek closure Attitude The Presence of a stone ledge

7 DATA COLLECTION Data Collection 1- Hydrographic measurements: Bathymetric Survey 2-Measuring the speed of water current: used for calibration process. 3-Hydrological data: including water levels and discharges.

8 MESH GENERATION Mesh Generation Geographic Information Systems (GIS) was used for data preprocessing to create a closed polygon representing the stretch of the river to be modeled. Triangular Irregular Network (TIN) mesh has been intensified in both irregular areas and around islands

9 BATHYMETRY INTERPOLATION Bathymetry Interpolation The bathymetric survey data was then interpolated with the TIN to generate a surface representing the river bed and sloped sides.

10 THE PRESENT SITUATION The Present Situation Velocity Vectors Average speed at the intake is 0.10 m/s

11 ALTERNATIVE SOLUTION (I) Alternative I Demolishing of Stone Peaks From The Central Island Velocity Vectors Average speed at the intake is 0.20 m/s

12 ALTERNATIVE SOLUTION (II) Alternative II The Reopening of The Western Creek Island Velocity Vectors Average speed at the intake is 0.26 m/s

13 COMPARING BETWEEN ALTERNATIVES Comparing Between Alternatives Model Results into Raster Grid Raster grid for the hydrodynamic model results, 1st alternative

14 COMPARING BETWEEN ALTERNATIVES Comparing Between Alternatives Ratio Grids the intake Raster grid for the hydrodynamic parameters ratios, 1 st alternative to the original case

15 COMPARING BETWEEN ALTERNATIVES Comparing Between Alternatives Weighted Ratio Grids Generation Weighted grid = Σ (W i x RG i ) W i represents the weight assigned (Σ W i =1) RG i represents each of the ratios grids (velocity ratios grid, depth ratios grid, and water levels ratios grid)

16 CONCLUSIONS Conclusions The 2D hydrodynamic model could successfully simulate the temporal and spatial mixing patterns of incoming flows through a river cross section and become a useful tool in determining the optimum water intake location in main rivers. After studying the different alternatives proposed to solve the sedimentation problem, and according to the 2D hydrodynamic model results, and when focusing locally on the intake location, it will be recommended to apply alternative 2. However when applying the proposed comparison technique to the area surrounding the intake location it can be seen that alternative 1 will have the more extended effect to the area surrounding the intake than that of alternative 2. The proposed technique could be adopted when selecting the most suitable locations for water intake location along rivers and water ways. However, extended work may be made to add other hydraulic parameters (i.e. shear bed stress, and velocity directions).

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