In the

water transport Maritime transport (or ocean transport) or more generally waterborne transport, is the transport of people (passengers or goods (cargo) via waterways. Freight transport by watercraft has been widely used throughout recorded history, as it pr ...

, the navigation season (or shipping season) is a period of the year during which a

waterway A waterway is any Navigability, navigable body of water. Broad distinctions are useful to avoid ambiguity, and disambiguation will be of varying importance depending on the nuance of the equivalent word in other ways. A first distinction is ...

is open for

navigation Navigation is a field of study that focuses on the process of monitoring and controlling the motion, movement of a craft or vehicle from one place to another.Bowditch, 2003:799. The field of navigation includes four general categories: land navig ...

. The opening and closing dates of the season are determined annually by the waterway administration to accommodate the weather, water flow and ice conditions as well as the transportation demands. The term is also frequently used to designate number of days per year with easy navigation.

Terminology

In a general sense, in different contexts the term has slightly different meanings, multiple expressions are used (for the

Northern Hemisphere The Northern Hemisphere is the half of Earth that is north of the equator. For other planets in the Solar System, north is defined by humans as being in the same celestial sphere, celestial hemisphere relative to the invariable plane of the Solar ...

): * ''summer navigation season''; * ''winter navigation season'' with some waterways closed; * ''ice-free navigations season'' / ''independent navigation period'' when the ships can get through without the assistance from an

icebreaker An icebreaker is a special-purpose ship or boat designed to move and navigate through ice-covered waters, and provide safe waterways for other boats and ships. Although the term usually refers to ice-breaking ships, it may also refer to smaller ...

. A ''traditional'' navigation season naturally varies from оne year to another, a ''fixed'' navigation season alternative sets firm dates for opening and closing (that can be changed based on conditions, but only to shorten the period), an ''extended'' navigation season utilizes technical means to continue navigation under adverse conditions (e.g., ice). A navigation window is created by a short controlled release of water from an upstream reservoir to temporarily create a higher river stage for the purpose of navigation.

History

Antiquity

Ancient Greece Ancient Greece () was a northeastern Mediterranean civilization, existing from the Greek Dark Ages of the 12th–9th centuries BC to the end of classical antiquity (), that comprised a loose collection of culturally and linguistically r ...

, the navigation period on the

Mediterranean Sea The Mediterranean Sea ( ) is a sea connected to the Atlantic Ocean, surrounded by the Mediterranean basin and almost completely enclosed by land: on the east by the Levant in West Asia, on the north by Anatolia in West Asia and Southern Eur ...

lasted while the

Pleiades The Pleiades (), also known as Seven Sisters and Messier 45 (M45), is an Asterism (astronomy), asterism of an open cluster, open star cluster containing young Stellar classification#Class B, B-type stars in the northwest of the constellation Tau ...

star cluster was visible (May to November). Some interpretations of the

Story of Wenamun The Story of Wenamun (alternately known as the Report of Wenamun, The Misadventures of Wenamun, Voyage of Unamūn, or nformallyas just Wenamun) is a literary text written in hieratic in the Late Egyptian language. It is only known from one incom ...

(

Ancient Egypt Ancient Egypt () was a cradle of civilization concentrated along the lower reaches of the Nile River in Northeast Africa. It emerged from prehistoric Egypt around 3150BC (according to conventional Egyptian chronology), when Upper and Lower E ...

, circa 1000 BC) and texts from

Ugarit Ugarit (; , ''ủgrt'' /ʾUgarītu/) was an ancient port city in northern Syria about 10 kilometers north of modern Latakia. At its height it ruled an area roughly equivalent to the modern Latakia Governorate. It was discovered by accident in 19 ...

(2nd millennium BC) suggest the existence of navigation seasons even earlier.

Europe

Navigation periods in Europe have a long history. Maritime law of

Hanseatic League The Hanseatic League was a Middle Ages, medieval commercial and defensive network of merchant guilds and market towns in Central Europe, Central and Northern Europe, Northern Europe. Growing from a few Northern Germany, North German towns in the ...

already in the 13th century stated that the ships must remain in the winter ports after

St. Martin's Day Saint Martin's Day or Martinmas (obsolete: Martlemas), and historically called Old Halloween or All Hallows Eve, is the feast day of Saint Martin of Tours and is celebrated in the liturgical year on 11 November. In the Middle Ages and early mod ...

(November 11). By the 15th century more detailed laws allowed sailing on the

Baltic Sea The Baltic Sea is an arm of the Atlantic Ocean that is enclosed by the countries of Denmark, Estonia, Finland, Germany, Latvia, Lithuania, Poland, Russia, Sweden, and the North European Plain, North and Central European Plain regions. It is the ...

from

Cathedra Petri The Chair of Saint Peter (), also known as the Throne of Saint Peter, is a relic conserved in St. Peter's Basilica in Vatican City, the sovereign enclave of the Pope inside Rome, Italy. The relic is a wooden throne that tradition claims belonged ...

(February 22) to St. Martin's Day. The season in the

North Sea The North Sea lies between Great Britain, Denmark, Norway, Germany, the Netherlands, Belgium, and France. A sea on the European continental shelf, it connects to the Atlantic Ocean through the English Channel in the south and the Norwegian Se ...

was even shorter, from one

Feast of the Cross The Feast of the Holy Cross, or Feast of the Cross, commemorates True Cross, the cross used in the crucifixion of Jesus. In the Christianity, Christian liturgical calendar, there are several different celebrations which honor and celebrate the ...

(

Invention of the Cross An invention is a unique or novel device, method, composition, idea, or process. An invention may be an improvement upon a machine, product, or process for increasing efficiency or lowering cost. It may also be an entirely new concept. If an i ...

on May 3) to another (

Exaltation of the Cross The Feast of the Holy Cross, or Feast of the Cross, commemorates True Cross, the cross used in the crucifixion of Jesus. In the Christianity, Christian liturgical calendar, there are several different celebrations which honor and celebrate the ...

on September 14).

USA

Multiple

Rivers and Harbors Act Rivers and Harbors Act may refer to one of many pieces of legislation and appropriations passed by the United States Congress since the first such legislation in 1824. At that time Congress appropriated $75,000 to improve navigation on the Ohio an ...

s left the administration of navigation on the major US waterways, including the commencement and closing of the navigation season, to the

U.S. Army Corps of Engineers The United States Army Corps of Engineers (USACE) is the military engineering branch of the United States Army. A direct reporting unit (DRU), it has three primary mission areas: Engineer Regiment, military construction, and civil wor ...

(USACE).

References

Sources

* * * * * * * * Nautical terminology Navigation {{water-transport-stub