Physical properties of inland lakes and their interaction with global warming: A case study of Lake Nasser, Egypt
Radwan G. Abd Ellah
Lake ecosystems are indispensable assets for aquatic natural life and human needs, and any modification of their ecological quality and water restoration rates has far-reached ecological and social ramifications. Changes in water temperature affect the physico-chemical and natural attributes of lakes. Thermal stratification is a significant factor for ecological and water quality procedures inside lake frameworks. The thermal stratification and mingling process are influenced by various factors, for example, the atmosphere condition, the morphometry and the hydrology of lakes. The adjustments in water temperature and stratification may have noteworthy natural results particularly in the midst of worldwide changes and direct human effect on the lakes. Lake Nasser is the national freshwater bank of Egypt. In the winter season, the water flow increases into the unstratified lake, and is not stratified. While in summer, the main feature of the lake is the appearance of a thermocline. The electrical conductivity and pH gradient are semi-homogeneous in winter, while in summer, they are obvious. The impacts of climate change are clear in Lake Nasser because of its sensitivity to changes in temperature and precipitation. Lake Nasser, and subsequently its Khors, vary in their total surface areas and morphometrical features as a result of the climate change and the building of the Ethiopian Renaissance Dam. The temperature changes radically affect Lake Nasser, they will prompt a higher rate of evaporation and reduce its surface. On the contrary, such changes will increase the fishing and fish production of the lake.
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