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Thalweg
In geography, hydrography, and fluvial geomorphology, a thalweg or talweg () is the line or curve of lowest elevation within a valley or watercourse. Normally only the horizontal position of the curve is considered (as viewed on a map); the corresponding vertical position is represented in a '' stream profile''. Under international law, a thalweg is instead taken to be the middle of the primary navigable channel of a waterway which is the default legal presumption for the boundary between entities such as states. Thalwegs can have local proprietorial and administrative significance because their formerly somewhat shifting position, reliant on renewed soundings, now more fixed as described internationally, is part of centuries-old custom and practice in some jurisdictions. In some jurisdictions and between some states the median line (between banks) is the preferred boundary presumption as may extend from estuaries. Also being easy to map, drawing "turning points" are the s ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Shatt Al-Arab
The Shatt al-Arab () is a river about in length that is formed at the confluence of the Euphrates and Tigris rivers in the town of al-Qurnah in the Basra Governorate of southern Iraq. The southern end of the river constitutes the Iran–Iraq border down to its mouth, where it discharges into the Persian Gulf. The Shatt al-Arab varies in width from about at Basra to at its mouth. It is thought that the waterway formed relatively recently in geological time, with the Tigris and Euphrates originally emptying into the Persian Gulf via a channel further to the west. Kuwait's Bubiyan Island is part of the Shatt al-Arab delta. The Karun, a tributary which joins the waterway from the Iranian side, deposits large amounts of silt into the river; this necessitates continuous dredging to keep it navigable. The area used to hold the largest date palm forest in the world. In the mid-1970s, the region included 17–18 million date palms: an estimated one-fifth of the world's 90 mil ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Border
Borders are generally defined as geography, geographical boundaries, imposed either by features such as oceans and terrain, or by polity, political entities such as governments, sovereign states, federated states, and other administrative division, subnational entities. Political borders can be established through warfare, colonization, or mutual agreements between the political entities that reside in those areas. Some borders—such as most states' internal administrative borders, or inter-state borders within the Schengen Area—are open border, open and completely unguarded. Most external political borders are partially or fully controlled, and may be crossed legally only at designated border checkpoints; adjacent Border control#Border zones, border zones may also be controlled. For the purposes of border control, airports and Port#Seaport, seaports are also classed as borders. Most countries have some form of border control to regulate or limit the movement of people, animals ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Treaty Of Versailles
The Treaty of Versailles was a peace treaty signed on 28 June 1919. As the most important treaty of World War I, it ended the state of war between Germany and most of the Allies of World War I, Allied Powers. It was signed in the Palace of Versailles, exactly five years after the assassination of Archduke Franz Ferdinand, which led to the war. The other Central Powers on the German side signed separate treaties. Although the Armistice with Germany (Compiègne), armistice of 11 November 1918 ended the actual fighting, and agreed certain principles and conditions including the payment of reparations, it took six months of Allied negotiations at the Paris Peace Conference (1919–1920), Paris Peace Conference to conclude the peace treaty. Germany was not allowed to participate in the negotiations before signing the treaty. The treaty German disarmament, required Germany to disarm, make territorial concessions, extradite alleged war criminals, agree to Kaiser Wilhelm being p ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Iranian Borders In Omans And Persian Gulf (Cro)
Iranian () may refer to: * Something of, from, or related to Iran ** Iranian diaspora, Iranians living outside Iran ** Iranian architecture, architecture of Iran and parts of the rest of West Asia ** Iranian cuisine, cooking traditions and practices Other uses * Iranian peoples, the speakers of the Iranian languages. The term Iranic peoples is also used for this term to distinguish the pan-ethnic term from Iranian, used for the people of Iran * Iranian languages, a branch of the Indo-Iranian languages * Iranian.com, also known as ''The Iranian'' and ''The Iranian Times'' See also * Persian (other) * Iranians (other) * Languages of Iran * Ethnicities in Iran * Demographics of Iran * Indo-Iranian languages * Irani (other) * List of Iranians This is an alphabetic list of notable people from Iran or its historical predecessors. In the news * Ali Khamenei, supreme leader of Iran * Ebrahim Raisi, former president of Iran, former Chief Justice of Iran. ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Umatilla, Oregon
Umatilla (, ) is a city in Umatilla County, Oregon, United States. The population in 2010 was 6,906, but the city's population includes approximately 2,000 inmates incarcerated at Two Rivers Correctional Institution. Umatilla is part of the Hermiston- Pendleton Micropolitan Statistical Area, but has the highest poverty rate (24%) and lowest Median Household Income ($38,796) of all communities in the area, trailing neighboring Hermiston in household income by nearly 23%. The city is on the south side of the Columbia River along U.S. Route 730 and I-82. The Umatilla Chemical Depot, is southwest of the city, northwest of the intersection of I-84 and I-82. History Before European settlement, the peninsula formed by the convergence of the Umatilla and Columbia rivers had been occupied by the indigenous Umatilla people for at least 10,000 years, being the site of temporary and seasonal villages, fishing and later horse breeding. On their return trip from the mouth of th ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Freshwater Inflow
Estuary freshwater inflow is the freshwater that flows into an estuary. Other types of environmental flows include ''instream flow'', the freshwater water flowing in rivers or streams, and ''estuary outflow'', the outflow from an estuary to the ocean. Estuaries Freshwater inflow: Freshwater flows into an estuary and mixes with the marine water of the estuarine ecosystem. The mixing of freshwater inflow and the marine water of the estuarine ecosystem occurs spatially and temporally from climatic influences including tidal action, seasonal variability and storms. Mixing is affected by the amount of estuarine system. The tides and the volume of the receiving estuary govern the volume of seawater. Tides are defined as the periodic rise and fall of the surface of the sea along the coast that are driven by the gravitational pull of the moon and of the sun. Although estuaries are influenced by the tides, they are often somewhat protected from storms and tidal action by buffers furt ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Stream Bed
A streambed or stream bed is the bottom of a stream or river and is confined within a Stream channel, channel or the Bank (geography), banks of the waterway. Usually, the bed does not contain terrestrial (land) vegetation and instead supports different types of aquatic vegetation (aquatic plant), depending on the type of streambed material and water velocity. Streambeds are what would be left once a stream is no longer in existence. The beds are usually well preserved even if they get buried because the banks and canyons made by the stream are typically hard, although soft sand and debris often fill the bed. Dry, buried streambeds can actually be underground water pockets. During times of rain, sandy streambeds can soak up and retain water, even during dry seasons, keeping the water table close enough to the surface to be obtainable by local people. The nature of any streambed is always a function of the flow dynamics and the local geologic materials. The climate of an area wil ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Hydrology
Hydrology () is the scientific study of the movement, distribution, and management of water on Earth and other planets, including the water cycle, water resources, and drainage basin sustainability. A practitioner of hydrology is called a hydrologist. Hydrologists are scientists studying earth science, earth or environmental science, civil engineering, civil or environmental engineering, and physical geography. Using various analytical methods and scientific techniques, they collect and analyze data to help solve water related problems such as Environmentalism, environmental preservation, natural disasters, and Water resource management, water management. Hydrology subdivides into surface water hydrology, groundwater hydrology (hydrogeology), and marine hydrology. Domains of hydrology include hydrometeorology, surface-water hydrology, surface hydrology, hydrogeology, drainage basin, drainage-basin management, and water quality. Oceanography and meteorology are not included beca ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
