النمذجة المكانية لأخطار السيول في حوض وادي المخروق شمال مدينة القريات، المملكة العربية السعودية

الملخص EN

Due to the excessive amount rainfall, flash flooding's take place in dry areas as it cause significant properties and lives loss.

Urban and agricultural areas, railway route down the mouth of Al-Makhroug Valley north of Quryate city, which are placed in danger of frequent flooding's.

It is crucial to take such flooding's into consideration as the decision maker must set rapid measures to minimize the dangers of such flooding's.

The current study aims are to analyze the hydromorfemetric features, estimate the amount of flooding's to the basin of Al-Makhroug Valley, to identify the urban and agricultural areas in dangers, the dangers that threatens the north rout of the railway which located in the area of Al-Makhroug Valley, the tributaries and estuaries which are exposed to the dangers of the flooding's.

To accomplish such goals, the warehouse management system (WMS) was used to calculate the credit of the hydromorfemetric features.

Moreover, the geometric hydrology model (HEC-HMS) was used to calculate the hydrographic flooding curve to the different draingag basins, to estimate the calculation of the amounts of the flooded water, and to also calculate the rates of its flow based on (SCS Unit Hydrograph).

The rainfall periods have been analyzed and estimated its depth in the previous years (100, 50, 25, 20, 10, 5) according to the Al-Hadethah city station (SK 114).

The study results revealed that Al-Makhroug Valley stretch's long is 92.42 kilometers, the space area of the basin is about 1327,6 Km2, and the amount of the flooding's is estimated between 21400-8676400 m2 during the previous year's 5-100.

The maximum flooding flow amount to Al-Makhroug Valley is between 61.9-0.2 m3/s during the periods 5-100.

The result of the estimated risks of Al-Makhroug Valley flooding's is about 14% of Al-Hadithah port which is exposed to the flooding's that contains existing facilities which are presented in farries and bridges cannot pass the maximum flow to Al-Makhroug Valley basin.

Therefore, this matter increases the dangers of flooding's against the North railway.

However, the present study has come up with important recommendations to reduce the risks of Al-Makhroug Valley flooding's.