International Journal of Academic and Applied Research (ijaar)

International Journal of Academic and Applied Research (IJAAR) 
ISSN: 2643-9603 
Vol. 5 Issue 2, February - 2021, Pages: 3-5 
www.ijeais.org/ijaar 
5 
Sea immediately fell. Irrigated lands in the region decreased 
during unfavorable periods (wars, revolutions, etc.) and 
rivers flooded the Aral Sea again. 
III. Conclusion 
E.G. Geological and hydrological studies conducted 
by Maev show that in the 1980s a number of well-known 
geographers found that the Amudarya and Syrdarya were 
constantly changing their routes and migrating through the 
Central Asian system during the historical period, often the 
Aral Sea, They showed that they had not reached the Aral 
Sea. dried up and a desert zone appeared in its territory. At 
the same time, during the drying of the sea, the salinity of 
the water rose sharply, which helped to identify salts 
discovered by geologists in the lower Aral Sea[6.p.26]. The 
migration of deltas of both Amudarya and Syrdarya created 
a very peculiar downstream, in which the swamp deltas 
filled with sediments were cut by a large number of desert, 
fine dusty, sandy deposits, forming a new delta. Analyzes by 
zoologists have shown that only a small number of species 
of the marine ocean have been preserved in the Aral Sea, 
where a huge complex of saltwater groups up to the Caspian 
estuary fauna has been destroyed. Not all the rivers that flow 
into the island have preserved marine fish species, or at least 
the remains of this fauna. This indicates that the waters of 
the Amudarya and other rivers in one way or another entered 
the Aral Sea basin, entered through the lower Uzbay valley 
and into the Caspian Sea. created a lake from which about 
20% of the water flowing (which he determined 
hydraulically) flowed into the Caspian Sea via the Uzboy. 
This water flow continued in the IV-III millennia BC and 
was periodically poured into the Syrdarya Aral Sea in the 
early II millennium BC. It is now clear that the Aral Sea has 
undergone five or seven (according to recent radiocarbon 
studies of lower sedimentary rocks) transgressions, with 
their highest terraces reaching 72-73 meters. 
In the early 19th century, the level of the Aral Sea 
was low. In 1845 and after 1860 some growth was recorded. 
In the early 1980s, this level dropped particularly sharply, 
leading researchers at the time to conclude that water levels 
in Central Asia were declining. However, in the 1980s, the 
Aral Sea began to rise, first slowly and then accelerated . 
This process continued until 1906. In 1907 the process 
stopped, in 1908 the growth, in 1909 the decline. Growth 
was again recorded in 1910, 1911, 1912, and then until 1917 
this level changed slightly. 
In the late nineteenth and early twentieth centuries, 
the amplitude of vibrations did not exceed three meters. In 
the flow formation zone, the natural water resources of the 
Amudarya (excluding the closed drainage areas of Tejen, 
Murgab and others) reached 75 km3 per year and 37 km3 
per year in the Syrdarya (112 km3 per year). 
IV.References 
1.
Дальний Б.Н. А.Северцов-путешествинник 
и зоолог.-Воронеж, 1950. 24 с 
2.
Азатьян А.А А.П.Федченко- географ и 
путешественник. М.: Геограгиз, 1956.- 128 с 
3.
А. Nabiyev Tarixiy o’lkashunoslik. T. 1996. 
20 b 
4.
Каульбарс А.В. Низовья Аму-Дарьи, 
описанные по собственным исследованиям 
в 1873 г. // Туркестанский сборник. Том 282. 
1881. С. 10 
5.
Ozodbek Radjabov. А new approach and 
analysis to the issue of great game in modern 
western historiography. EPRA International 
Journal of Multidisciplinary Research. Volume: 
6 Issue: 4 April 2020 
6.
Берг Л. Аральская море. Опыт физико-
географической монографии. Известия 
Туркестанского отдела ИРГО [1907] // 
Туркестанский сборник. Том 575. 1916. С. 
133.
7.
В.Аленицина Труды Арало-Каспiйской 
экспедицiи Випускъ IIIСП-Б 1876. С 2