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İstanbul Teknik Üniversitesi (1997)

Hydrometeorological aspects and water resouces management in the northern part of Libya

Eljadid, Ali Geath Mahmoud

Titre : Hydrometeorological aspects and water resouces management in the northern part of Libya

Auteur : Eljadid, Ali Geath Mahmoud

Université de soutenance : İstanbul Teknik Üniversitesi

Grade : Doctor of Philosophy (PhD) 1997

Libya faces severe water problems especially at its northern regions and needs new water policies to achieve sustainable development in its harsh environment. Problems include balancing supply and demand while facing aridity and water scarcity, nonrenewable supplies, poor quality of groundwater, salt water intrusion, low rainfall amounts, high pumping water from the aquifers with less recharge by rainfall, high loss due to evapotranspiration and runoff to the sea. Although a great deal is known about its water resources and problems, this thesis has objective to investigate the important meteorological parameters which play a major part in any local hydrological system and even in the global water cycle. This research concentrates on the wet and dry spells with their geographical distributions which indicate subareas suitable for agricultural activities in addition to identify water poor areas. On the other hand, this research aims to produce revised water management system by taking into consideration both hydrometeorological and hydrological parameters. The system takes into account the total available water amounts and lost water, including rainfall, evapotranspiration, surface runoff, groundwater, desalinated and recycled water in addition to the Man-Made River. These resources and losses are considered as parameters for the regional water balance model as well as water management system. Results show very good agreements with the actual face of the water system and meaningful conclusion and recommendations have been maintained. Libya, in general, is an arid region, less amount of precipitation falls over the country. Rainfall data analyzed during this thesis show that precipitation deficit occurs in many years with the rainy seasons. Winter is the most rainy season by about 274.4 Mm3 in volume followed by spring season by about 84.2 Mm3 decreases to about 71.9 Mm3 during autumn season, however, no significant rainfall during summer. Rainfall in the whole regions is confined to the period of October- April. The maximum rainfall occurs in December followed by January and rainfall amounts decrease southward. Short rainfall duration occur relatively frequently than long duration. Dry spells are longer than wet spells. Short flood in the winter months may have chance to occur along the coastal line regions, hence, the maximum peak of groundwater recharge for a short time may occur at these regions. In summer and autumn seasons the drought is inevitable on all regions, especially at the inland regions. Domestic and agriculture demands on water expected to increase in the year 2000. Domestic demand will reach to about 452.6 Mm3/year. On the other hand, about 87% of total water demand related to agricultural purposes.


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