تطبيق نموذج المنحنى المائي الأحادي في تقدير تدفق الذروة لسيول الأودية الداخلة على مدينة بريدة بمنطقة القصيم (المملكة العربية السعودية)‎

Abstract EN

Management of runoff resources resulting from the flow of wadis in urban areas requires knowledge of the sources and the availability resources periods due to the precipitation in arid and semi-arid areas.

The various regions of Saudi Arabia suffer from the lack of measurements and quantitative data on runoff, because the total absence of hydrometric during runoff periods.

So, this study provides an estimate of the maximum daily discharge of Wadis Al-Naqib, Al Watah, Al-Awshez, Al-Ud and Al-Wad’i , tributaries of Wadi Ar Rummah.

The urban area of Buraydah city is extended on the outlets of these wadis in several areas.

The discharge estimate is computed by the SCS Dimensionless Unit Hydrograph model developed by the SCS in 1972.

This model is one possible alternative for estimating surface water resources during the precipitation periods of studied drainage basins areas, ranging between 49.8 km2 in the Al-Ud basin and 639.5 km2 in the Al Watah basin.

The SCS DUH model was selected because two reasons, the first is the availability of the morphometric data of studied drainage basins derived from the digital elevation model (SRTM) DEM with the resolution of 30 m.

The second reason is the availability of daily rainfall data during the period from 1978 to 2013 (34 years) at the Prince Nayef Airport meteorology station (40405) located at latitude N26o19' and longitude E43o46' and at a height of 647 m and Buraydah rainfall station (U 107) located on latitude N26o20' and longitude E43o58' and at a height of 632 m.

The application of the SCS DUH model showed that the average of the discharge peak of the return periods from 5 to 100 years is ranged between 63.9 m3/s in the Wadi Al-Awshez basin and 250.1 m3/s in Wadi Al Watah basin.

The specific discharge peak resulted from this discharge peak is ranged from 0.27 m3/s/km2 in Al Awshez basin to 3.00 m3/s/km2 in Al-Ud basin.