An estuary is a funnel-shaped river mouth with one sleeve, expanding closer to the sea. When the sediment - land and sand brought by wind or water - is removed either by the sea current or by the tide, and the part of the sea adjacent to this place is deeper, an estuary is formed. Yenisei, Don and many other rivers have estuaries in the form of estuaries. The opposite concept of an estuary in geography is considered to be a delta. This is a river mouth divided into streams. The Nile, Amazon and Volga have such a part of the water stream, but the latter, in turn, forms an estuary when it flows into the Caspian Sea.
How does an estuary appear?
Typically, a river estuary is the result of immersion in water from a section of the coast of a watercourse. This process is accompanied by flooding of its lower part. Tides have a strong effect on the estuary, as a result of which salt (ocean and sea) as well as fresh (river) waters fall into the riverbed . The tides often occur with such force that the flow sinks back, and the salty and fresh waters penetrate many kilometers deep into the earth. If such a tide falls on a rather narrow V-shaped estuary with very steep and high banks, the water level can rise so much that a huge wave is formed called boron. In this case, he will penetrate deep into the earth until he completely squanders all his energy.
The largest estuaries
An estuary is a place convenient for navigation, as it is protected from all sides. Many sites even have fairly large cities. For example, Lisbon is located on the estuary of the Tagus River.
The largest world site of this type is called La Plata. It is located between the countries of Uruguay and Argentina. There, rivers such as Paraguay and Parana flow into the sea. It is on the banks of the La Plata estuary that the cities of Montevideo and Buenos Aires are located.
Climatic conditions
An estuary is a place where the climate is very stable and rarely “pleases” with new and unexpected precipitation. For example, most often the monsoon character may prevail. It is a constant tropical wind. As a rule, in summer they come from the land, and in winter - from the sea. Summer in such conditions is somewhat cool - about 15 degrees. And also the described climatic conditions make it clear that the estuary is a site that can constantly be fed by the waters of the rains. An example of such a territory is the Bay of St. Lawrence. It is constantly visited by tourists and can always please with its landscapes.