Vajad kellegagi rääkida?
Küsi julgelt abi LasteAbi
Logi sisse

Lake Võrtsjärv (0)

1 Hindamata
Punktid
Lake Võrtsjärv
Scientific  editors
Juta  Haberman
Ervin  Pihu
Anto  Raukas
Liis Sommer
The  outline
Rural  municipalities
River geology
Shores
Flows
Temperature
Planktonic algae
Fishes
Animals
Lake Võrtsjärv is a lake in  southern  Estonia with an area 
of 270 km² . It is the second largest lake of Estonia. The 
shal ow lake is 33.7 m  above  sea level. The 
river Emajõgi flows from Lake Võrtsjärv to Lake  Peipsi .
Образец текста
Второй уровень

Третий уровень

Четвертый уровень

Пятый уровень
Lake Võrtsjärv area comprises seven  rural municipalities bordering the water, 
connected with each other  by traditions of joint  activities, set  throughout  history. The 
development  of Lake Võrtsjärv and its vicinity, and planned utilisation of Lake 
Võrtsjärv as a  resource , is the common interest of all rural municipalities. The 
mentioned rural municipalities are  located  on the territories of three  different  counties:
Rannu  and Rõngu - in Tartu County ;
Puka  and Põdrala - in Valga County;
Tarvastu, Viiratsi and  Kolga -Jaani - in Viljandi County
Võrtsjarv is the largest lake  within the 
boundaries of Estonia. Not considering 
Lake Peipsi on the  Russian border, it 
surpasses all other Estonian lakes  
Образец текста
together by the surface area. The few 
Второй уровень
islands  are mostly located in the 
Третий уровень
southern part of the lake. Tondisaar 
Четвертый уровень
and Pähksaar are  permanent  islands 
Пятый уровень
while  Ainsaar turns into a peninsula 
during low water, and Heinassaar is 
flooded in high water periods. 
The shores of Võrtsjarv are mostly low: swampy in the 
southern part, and sandy  in the  northern part; the  eastern  
shore  is  higher . Despite its large surface area, the lake is 
shallow . The deepest  place   lies   between the eastern shore 
and the  island of Tondisaar  along the submerged 
elongation of the riverbed of the Väike Emajõgi River. 
The lake depression is of preglacial origin but has 
somewhat been influenced by glaciers. On the eastern 
shore the Devonian sandstone bedrock is denuded along  
a stretch of  several  kilometres.
This abrasion shore at 
Образец текста
Tamme is 3 - 8 m  high and 
subjected to protection as a 
Второй уровень
famous finding-place of 
Третий уровень
fossil placoderm fishes. In 
Четвертый уровень
the southern part the lake 
Пятый уровень
bottom is covered with a mud 
layer  up to 5.5 m thick, 
which is gradually being 
replaced by sandy mud and 
sand  in the direction of north; 
the mud is lying  on the  marl
The  total  thickness  increases  
southwards, up to 7.6 m.
Võrtsjärv has tens of inflows collecting their 
water in three counties, on 
a catchment area exceeding the lake surface 
Образец текста
twelve  times. Väike Emajõgi, Õhne, Tarvastu, 
and Tänassilma rivers are the largest inflows. 
Второй уровень
Suur Emajõgi is the  single  outlet. Lake 
Третий уровень
Võrtsjarv is devoid of any outflow. As a result, 
Четвертый уровень
the high waterlevel  usually  lasts for several 
Пятый уровень
months in spring , while  even the  rise  in 
autumn can be noteable. The  mean annual 
difference  in the lake volume between the high 
and low water level can be threefold. 
A permanent  current system in the lake is 
lacking.
The lake is covered with ice on the  average  for 
135  days  a year, from the end of November till 
the end of April. The average water temperature Образец текста
rises up to 17-21°C in  July . Võrtsjärv is a 
Второй уровень
strongly eutrophic lake. The  fast  expansion of 
Третий уровень
reed  thickets and the deterioration of biological 
diversity  are a  clear  evidence of the 
Четвертый уровень
eutrophication  of the lake during the last 
Пятый уровень
decades.  However , the high carbonate content of 
water protects the lake against acid rains. Due to 
the prevalence of western winds, the reed belt is 
continuous  and  lush on the sheltered western 
shore and  broken  at the  open  eastern one. The 
narrow  southern end, especially  beginning from 
Pähksaar Island is totally overgrown with  yellow  
and white lilies, pondweeds, arrowhead, bulrush, 
and other water  plants .
The  amount  of planktonic algae can 
reach  30g per cubic metre, with blue-
Образец текста
green  algae prevailing in  summer
Второй уровень
Water is turbid, yellowish-green or 
greenish yellow, with a transparency 
Третий уровень
of about 1m. Mud  particles  stirred up 
Четвертый уровень
by the  wave  action contribute to 
Пятый уровень
turbidity. The  zooplankton  of the lake 
consists of smaller animals  building  
up the summer biomass. The amount 
of bottom animals is low but variable 
in different  years .
 pic: plaktonic algae
About 35 fish   species  are in Lake 
Võrtsjärv.  Pike -perch, eel,  bream  and 
pike are the most important 
Образец текста
commercial fishes. In the fifties and 
Второй уровень
sixties  Võrtsjärv was known as a ruff 
lake since inferior fish  prevailed in 
Третий уровень
catches. After the  application of 
Четвертый уровень
measures proposed by scientists of the 
Пятый уровень
Limnological Station ,big and 
valuable  fish species became 
dominating. The natural eel have been 
caught in some years. The total yearly 
fish catch averages over 400 tons in 
Lake Võrtsjärv, with the share  of 
valuable fish 60-70%. 
Pic:  eels
Образец текста
Второй уровень
Третий уровень
The  coastal  area of Lake 
Четвертый уровень
Võrtsjärv is covered with 
Пятый уровень
woods ,fields,hayfields,wil
low plots and reed 
beds, witch  make it a 
perfect  habitat for many 
animal species.Like 
amphibians,reptiles and 
mammals .
Thanks for your attention ! 

Document Outline

  • Slide 1
  • The outline
  • Slide 3
  • Slide 4
  • Slide 5
  • Slide 6
  • Slide 7
  • Slide 8
  • Slide 9
  • Slide 10
  • Slide 11
  • Slide 12
  • Thanks for your attention ! 
Vasakule Paremale
Lake Võrtsjärv #1 Lake Võrtsjärv #2 Lake Võrtsjärv #3 Lake Võrtsjärv #4 Lake Võrtsjärv #5 Lake Võrtsjärv #6 Lake Võrtsjärv #7 Lake Võrtsjärv #8 Lake Võrtsjärv #9 Lake Võrtsjärv #10 Lake Võrtsjärv #11 Lake Võrtsjärv #12 Lake Võrtsjärv #13
Punktid 50 punkti Autor soovib selle materjali allalaadimise eest saada 50 punkti.
Leheküljed ~ 13 lehte Lehekülgede arv dokumendis
Aeg2014-03-31 Kuupäev, millal dokument üles laeti
Allalaadimisi 1 laadimist Kokku alla laetud
Kommentaarid 0 arvamust Teiste kasutajate poolt lisatud kommentaarid
Autor POMM Õppematerjali autor
Inglisekeelne esitlus teemal Võrtsjärv

Sarnased õppematerjalid

Eesti referaat
8
doc

Eesti referaat

The Baltic Glint is one of the world's most important denudations of Ordovician sedimetary rocks. Half of Estonia is covered with forests and 30 % is covered with wetlands. The areas which are higher and particularly rich in hills are the Haanja and Otepää Uplands in the southeastern part of Estonia. In Haanja Upland there is the highest top of Estonia, Big Egg Hill (318 m), which is the highest top of the Baltic states. There are over 1400 lakes in Estonia. Lake Peipsi, lying between Estonia and Russia, covers 3 555 sq km. It is the biggest in Estonia and the fourth biggest in Europe. The second largest lake is Lake Võrtsjärv (270 sq km), while the deepest id Rõuge Suurjärv (38 m). The longest rivers are the Võhandu (162 km) and Pärnu (144 km). The Emajõgi flows for 101 km and its drainage basin covers 9740 sq km. NATURE CONSERVATION AND PROTECTED AREAS In 2004 Estonia had 360 different protected areas, apart from 448

Inglise keel
Estonia topic
9
doc

Estonia topic

It has land contact with Russia from the east and Latvia from the south. In the north The Gulf of Finland separates Estonia from Finland. The Gulf of Riga is situated to the south-west. Estonia has more than 1500 islands. The biggest ones are located to the west. The four biggest islands are Saaremaa, Hiiumaa, Vormsi and Muhu. The highest point in Estonia and also in the Baltic region is Suur Munamägi. It is 318. above sea level. Estonia is a country of a thousand lakes. The Largest one is Lake Peipsi which is also the fourth biggest freshwater lake in Europe. Lake Peipsi and Lake Võrtsjärv are rich in fish. Estonia has many rivers but only nine of them are longer than 100km. The most important ones are Pärnu River and Emajõgi River Climate Estonia lies in the northern part of the temperate climate zone and in the transition zone between maritime and continental climate. Because Estonia is continuously warmed by the

Inglise keel
Estonia
8
pptx

Estonia

Estonia Where it is?  Republic of Estonia is a state in the Baltic region of Northern Europe .It is bordered to the north by the Finland, to the west by the Baltic Sea, to the south by Latvia (343 km), and to the east by lake Peipus  and Russia (338.6 km). Across the Baltic Sea lies Sweden in the west and  Finland in the north. Towns Tallinn is the capital and the largest city of Estonia. It lies on the northern coast of Estonia, along the Gulf of Finland. There are 33 cities and several town-parish towns in the country. In total, there are 47 linna, with "linn" in English meaning both "cities" and "towns". More than 70% of the population lives in towns.

Inglise keel
Estonia
5
doc

Estonia

Võnnu Keskkool ESTONIA Referaat Autor: Klass : 9 Juhendaja: Võnnu 2013 Estonia officially the Republic of Estonia, is a state in the Baltic region of Northern Europe It is bordered to the north by the Gulf of Finland, to the west by the Baltic Sea, to the south by Latvia and to the east by Lake Peipus and Russia.Across the Baltic Sealies Sweden in the west and Finland in the north. The territory of Estonia covers 45,227km2 The Estonian climate resembles that of other countries on the Baltic littoral. On account of the country's proximity to the sea, the skies are often cloudy, and rain often falls in the spring and autumn, in the winter the rain turns to snow. The highest point in Estonia is Suur Munamäg It is in fact the highest point in the Baltic region

Inglise keel
Estonia s nature
2
doc

Estonia's nature

are Saaremaa with 2671 sq km, Hiiumaa with 989 sq km and Muhu with 200 sq km. The sea between these islands and the Mainland ­ Väinameri ­ is very shallow (less than five metres deep on average) and rich in shoals. The water of the Baltic Sea is brackish. Its average saltinity is only one fourth of that of the sea in general. Thus, most Estonian freshwater fish (about 30 species) also inhabit the sea. There are some 1450 lakes in Estonia (6.1% of its territory). The two largest of them are Lake Peipsi (the fifth largest in Europe) at 3555 sq km and Võrtsjärv with its 270 sq km area. About 1440 vascular plant species grow in Estonia, while ¾ of the total number of species are found in the coastal lowlands and islands. There are 82 species of fish living in Estonia, which are hard to divide into freshwater and sea species. 357 bird species have been recorded in Estonia, 221 of them breed in Estonia. The bird life in Estonia is at its peak from the end of April to the beginning of July

Inglise keel
Topic - Canada 2
9
doc

Topic - Canada 2

mountainous and the tallest mountain in Canada is the Yukon's Mount Logan, which is 6050 meters tall. Canada has many mountain ranges. In the east there are the Appalachians, Torngats and Laurentias. In the western region there are the Rocky, Coastal and Mackenzie ranges and Mount St. Elias and the Pelly Mountains in the northern regions. Canada has about two million lakes and they cover about 7.6% of Canada's land. The biggest lakes in order by their surface are Lake Huron, Lake Great Bear, Lake Superior, Lake Great Slave (which is also the deepest), Lake Winnipeg, Lake Erie and Lake Ontario. There are also a lot of rivers in Canada. The longest river is the Mackenzie River which is 4241 kilometers long. It runs through the Northwest Territories. Other large and important rivers are the St. Lawrence River, the Yukon River, the Columbia River, the Nelson River, the Churchill River and the Fraser River. 4. Land regions Mountains

Inglise keel
Australia
6
doc

Australia.

It lies 335 km south west of the nearest large town, Alice Springs; 450 km by road. Kata Tjuta (The Olgas) and Uluru are the two major features of the Uluru - Kata Tjuta National Park. Uluru is sacred to the Aboriginal people of the area. It has many rock caves and ancient paintings. Water bodies: Australia is a very dry continent. There are very few rivers and no big lakes in Australia. Most of the lakes of Australia have water in them only after rain. The biggest lake of Australia is Lake Eyre and it is also the lowest point in Australia, at approximately 15 metres below the sea level. The lake is located in the deserts of central Australia. Even in dry season there is usually some water remaining in Lake Eyre. Australian temporary rivers are called creeks. The biggest rivers of Australia are in the eastern part of the country. The Murray River is the largest but the second longest river, only its tributary the Darling river is longer than it

Inglise keel
Canada topic
4
doc

Canada topic

The region gets its name because, historically, it has been the centre of political and economic power in the country. Canada's capital city is Ottawa, Ontario. Toronto and Montreal are the two largest cities in Canada. Central Canada is also the most heavily populated and industrialized area of Canada, particularly in the south around the Great Lakes and the St Lawrence River. The Great Lakes are the largest body of fresh water in the world. In order of size, they include Lake Superior, Lake Michigan, Lake Huron, Lake Erie, and Lake Ontario. These waterways along with the St Lawrence River are an important transportation route from the Atlantic Ocean to Canada's interior. Between Lake Eire and Lake Ontario, the Niagara River plunges over a rocky ledge and forms the famous Niagara Falls. In the far north we find the Hudson Bay Lowlands, which are cold, flat, and swampy, with very few cities

Inglise keel




Meedia

Kommentaarid (0)

Kommentaarid sellele materjalile puuduvad. Ole esimene ja kommenteeri



Sellel veebilehel kasutatakse küpsiseid. Kasutamist jätkates nõustute küpsiste ja veebilehe üldtingimustega Nõustun