Nasser Lake
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NAHUEL HUAPI´, LAKE Rhodes W. Fairbridge (Deceased)
Definition Nahuel Huapi is a glacial lake in the Patagonian Andes, near the boundary with Chile, at 765 m (2,516 ft) elevation. It is located in Neuquén Province on the edge of Rio Negro Province. Its area is 549 km2 (212 mi2). It is 65 km (40 mi) long, 8 km (5–6 mi) wide, and up to 300 m (1,000 ft) in depth. It has several fjord-like arms. An area of 7,848 km2 (3,030 mi2) is protected as a national park. In the SW is Mt. Tronador (over 3,350 m), which is covered by glaciers. Its scenery is spectacular, and the area is now a tourist destination, the town of San Carlos de Bariloche being situated on the SE shore. It is drained by the Limey R., which discharges into the Rio Negro. Cross-references South America, Lakes Review
NASSER LAKE Mohamed I. Balah Suez Canal University, Port Said, Egypt
Site Lake Nasser lies between latitudes 23 580 N and 20 270 N and longitudes 30 070 E and 33 150 E (Kim and Sultan, 2002; Ball, 1927; Dasco 1998a, b). The total length of the reservoir is about 500 km, with 150 km in Sudan (Lake Nubia) and 350 km within the Egypt’s borders (Kim and Sultan, 2002; Ball, 1927; Dasco, 1998a), see Figure 1. The lake has a surface area of 600 km2 and an average width of 12 km (Dasco, 1998b). The total storage capacity
of the lake is 160 109 m3, of which nearly 20% is considered dead storage (i.e., water is not released from this part of the lake regardless of the downstream needs). This zone receives and retains sediments during flooding. The lake is home to an impressive variety of birds, mammals, and reptiles. More than 100 species of birds live on its shores, including wild duck, Egyptian geese, pelicans, herons, egrets, and various species of hawks, kites, and falcons. Monitor lizards, Dorcas gazelle, jackals, desert fox, and other smaller desert mammals can also be observed. Lake Nasser has, arguably, the best freshwater fishing in the world for both Nile perch and tigerfish. There are also several subspecies of catfish and two kinds of tilapia. In all, there are around 32 species of fish in the lake. The two main fishing techniques used are trolling and shore fishing. Shore fishing requires more skill than trolling and usually yields more fish. Although trolling is more popular, larger fish can be caught shore fishing, the record catch being 179 lbs. Because the Lake Nasser reservoir is approaching its maximum storage capacity, the depressions west of Lake Nasser in the southwestern Desert of Egypt (Figure 1) are used as a natural flood diversion basin to reduce possible downstream damage to the Nile Valley caused by exceptional flooding (Kim and Sultan, 2002). The major strategic units and the ground water table level in Lake Nasser are shown in the hydrogeologic map (Figure 2a) and the schematic cross section (Figure 2b) along line A-A.
Climate change assessment Changes in water level interact with the physical features of Lake Nasser to yield both positive and negative geoenvironmental impacts (El Gammal, 2010; Nile Research Insti
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