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Volume :46 Issue : 176 2020      Add To Cart                                                                    Download

Estimating the Peak Discharge of Wadi Uranah Basin Drainage " Saudi Arabia ".

Auther : Prof. Mohammad F. Bourouba

Objectives: This study aimed to estimate the peak flow of Wadi Uranah tributary basins by applying the SCS Dimensionless Unit Hydrograph model. This model depends on the rainfall for the return periods from 5 to 100 years and the relief and morph metric variables of 36 tributary basins with areas ranged between 8.74 km2 in the tributary basin (33) and 196.2 km2 in the tributary basin (17). The relief and morph metric variables were determined using the WMS digital processing output and satellite imagery available on Google Earth and the ASTER Digital Elevation Model. However, this study seeks to classify tributary basins using the discharge peak average of return periods 5, 10, 25, 50 and 100 years.
Study Methodology: The methodology of this study was based on the application of the Normal and EV-1 probability Distribution models in the frequency analysis of maximum daily rainfall using rain data for five stations belonging to the Ministry of Environment, Water and Agriculture. The estimation of the discharge peak for the studied tributary basins was based on estimating the maximum daily rainfall, the peak of the maximum flow and concentration time.
Study Data: This study relied on the ERDAS 9.3 software for satellite image processors mainly to analyze the 12 satellite images (Scenes) of the study area in Makkah Al-Mukarramah in addition to the Digital Elevation Models of the Japanese-American scientific satellite (ASTER GDEM) with the resolution of 30 m in determining the drainage area of the Wadi Uranah basin. The WMS (Watershed Modeling System) software has been used to treat Digital Elevation Models and to perform calculations of morph metric and hydrological variables.
Results: The results of this study showed that the most tributary basins capable of converging rain water into floods water are basins: 17, 25 and 27 that extend over a total drainage area of 524.6 km2, equivalent to 22.9% of the total drainage area of the Wadi Uranah watershed. These basins are characterized by the highest rain volume with an avergae of more than 13 million m3 and the highest flood volume with an average of more than 2.5 million m3 and the highest maximum flow with an average of discharge peak exceeds 348m3/s, for the periods from 5 to 100 years..
Conclusion: This study was concluded with the results produced by the different applied methodological steps and different results of discharge peak estimation in the total of 36 tributary basins for Wadi uranah using the SCS Dimensionless Unit Hydrograph model.


Keywords: Maximum Daily Rainfall, Frequency Analysis, Tributary Basin, SCS DUG Model, Discharge Peak, Wadi Uranah Watershed, Saudi Arabia.

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