Document Details

Document Type : Article In Journal 
Document Title :
Physiographical and Hydrological Analysis of Yalamlam
التّحليل الطّبيعيّ الجغرافيّ و الهيدرولوجيّ يلملم
 
Subject : Physiographical and Hydrological Analysis of Yalamlam 
Document Language : English 
Abstract : Wadi Yalamlam is one of the Arabian Shield Wadis, located 70 km south of Makkah Al-Mukarramah city. The main rock units consist of Precambrian crystalline, meta−volcanic and metasedimentary rocks, with local Tertiary and Quaternary basalt flows ÆThe geographic setting of Wadi Yalamlam basin can be divided into three main zones: the Red Sea coastal plain (Tihamah), the hills, and the Scarp-Hijaz Mountains. The catchment area starts from the Hijaz Escarpment (Ashafa area) in the east to the Red Sea at the west ÆMorphometric analysis of the basin shows that it drains a large catchment area of about 1600 km2, very elongated, high relief, and of a moderate drainage densityÆ The mean annual and seasonal rainfalls of hydrological stations around the study area have been analyzed ÆSeasonal rainfall occurs in the mountains area, but varies from year to year. It often occurs as thunderstorms of high intensity during a local storm followed by dry periods. The average annual rainfall exceeds 200 mm in the mountains and decreases to 80 mm towards the Red Sea coast. In addition, Wadi Yalamlam has surface running water in the upstream most of the year. Runoff hydrographs of 0.5 hour duration were constructed, based on Snyder method, for three sub-basins of wadi Yalamlam. 
ISSN : 1012-1319 
Journal Name : Science Journal 
Volume : 13 
Issue Number : 1 
Publishing Year : 1422 AH
2001 AD
 
Article Type : Article 
Added Date : Sunday, January 30, 2011 

Researchers

Researcher Name (Arabic)Researcher Name (English)Researcher TypeDr GradeEmail
طارق بيوميBayumi, tariq InvestigatorDoctorate 

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