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Head Of Tide
Head of tide, tidal limit or tidehead is the furthest point upstream where a river is affected by tidal fluctuations, or where the fluctuations are less than a certain amount. The river section influenced by tides and marine forces, but without salinity is a tidal river. Downstream areas are brackish and termed estuaries. Although this point may vary due to storms, spring tides, and seasonal or annual differences in water flows, there is generally an average point that is accepted as the head of tide (in Great Britain this is the Normal Tidal Limit, typically noted on Ordnance Survey maps as 'NTL'). The head of tide is important in surveying, navigation, and fisheries management, and thus many jurisdictions establish a legal head of tide. As the head of tide is useful for navigation, separate maps can be made of the tidal zones up to the head of tide, such as was done in New Jersey. [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Cromwell Weir - Nottinghamshire (Geograph 2561867 By Jonathan Thacker)
Oliver Cromwell (25 April 15993 September 1658) was an English statesman, politician and soldier, widely regarded as one of the most important figures in British Isles, British history. He came to prominence during the Wars of the Three Kingdoms, initially as a senior commander in the Roundhead, Parliamentarian army and latterly as a politician. A leading advocate of execution of Charles I, the execution of Charles I of England, Charles I in January 1649, which led to the establishment of the Commonwealth of England, Cromwell ruled as Lord Protector from December 1653 until his death. Although elected Member of Parliament (United Kingdom), Member of Parliament (MP) for Huntingdon (UK Parliament constituency), Huntingdon in 3rd Parliament of Charles I, 1628, much of Cromwell's life prior to 1640 was marked by financial and personal failure. He briefly contemplated emigration to New England, but became a religious Independent (religion), Independent in the 1630s and thereafter be ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Hudson River
The Hudson River, historically the North River, is a river that flows from north to south largely through eastern New York (state), New York state. It originates in the Adirondack Mountains at Henderson Lake (New York), Henderson Lake in the town of Newcomb, New York, Newcomb, and flows south to the New York Bay , New York Bay, a tidal estuary between New York City, New York and Jersey City, Jersey City, before draining into the Atlantic Ocean , Atlantic Ocean. The river marks boundaries between several County (New York), New York counties and the eastern border between the U.S. states of New York and New Jersey , New Jersey. The lower half of the river is a tidal estuary, deeper than the body of water into which it flows, occupying the Hudson Fjord, an inlet that formed during the most recent period of North American Quaternary glaciation, glaciation, estimated at 26,000 to 13,300 years ago. Even as far north as the city of Troy, New York, Troy, the flow of the river chan ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Mean High Water
A chart datum is the water level, water surface serving as origin (mathematics), origin (or coordinate surface) of depth (coordinate), depths displayed on a nautical chart and for reporting and predicting tide heights. A chart datum is generally derived from some tidal phase, in which case it is also known as a tidal datum. Common chart datums are ''lowest astronomical tide'' (LAT)Australian Bureau of MeteorologNational Tide Centre Glossary(retrieved 30 April 2013) and ''mean lower low water'' (MLLW). In non-tidal areas, e.g. the Baltic Sea, mean sea level (MSL) is used. A chart datum is a type of vertical datum and must not be confused with the horizontal datum for the chart. However, it is necessarily an equigeopotential (a water "level surface"): the chart datum is tilted across smaller to larger tidal range regions; in rivers, it is a sloping and undulating surface following the low stage (hydrology), stage. Definitions The following tidal phases are commonly used in the ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Tideway
The Tideway is the part of the River Thames in England which is subject to tides. This stretch of water is downstream from Teddington Lock. The Tideway comprises the upper Thames Estuary including the Pool of London. Tidal activity Depending on the time of year, the river tide rises and falls twice a day by up to 7 m (24 ft). Because the tide goes against the outflow of fresh water from the Thames Basin, London Bridge is used as the basis for published tide tables giving the times of high tide. High tide reaches Putney about 30 minutes later. Low-lying banks of London are naturally vulnerable to flooding by storm surges. The threat has increased mostly due to the rise in sea levels caused by climate change, but some is also due to the extremely slow 'tilting' of Britain (up in the north and down in the south) due to post-glacial rebound. The city and state have erected defensive barriers, including the Thames Barrier, which was constructed across the Thames at Wo ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Tidewater (region)
Tidewater is a region in the Atlantic Plain, Atlantic Plains of the United States located east of the Atlantic Seaboard Fall Line, Atlantic Seaboard fall line (the natural border where the tidewater meets with the Piedmont region) and north of the Deep South. The term "tidewater" can be applied to any region where water levels are affected by the tide. Still, culturally and historically, the Tidewater region refers most commonly to the low-lying plains of southeastern Virginia (known as the coastal plain or Tidewater Virginia), eastern Maryland, the Eastern Shore of Virginia, Eastern Shore, and the Chesapeake Bay. It can also encompass Delaware, the remainder of the Delmarva Peninsula, and Northeastern North Carolina. The cultural Tidewater region got its name from the effects of changing ocean tides on local River, rivers, Sound (geography), sounds, and shorelines. The area has a centuries-old cultural heritage that sets itself apart from the adjacent inland parts of the United ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Tidal Bore
A tidal bore, often simply given as bore in context, is a tidal phenomenon in which the leading edge of the incoming tide forms a wave (or waves) of water that travels up a river or narrow bay, reversing the direction of the river or bay's current. It is a strong tide that pushes up the river, against the current. Description Bores occur in relatively few locations worldwide, usually in areas with a large tidal range (typically more than between high and low tide) and where incoming tides are funneled into a shallow, narrowing river or lake via a broad bay. The funnel-like shape not only increases the tidal range, but it can also decrease the duration of the flood tide, down to a point where the flood appears as a sudden increase in the water level. A tidal bore takes place during the flood tide and never during the ebb tide. A tidal bore may take on various forms, ranging from a single breaking wavefront with a somewhat like a hydraulic jumpto undular bores, compr ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Saint Lawrence River
The St. Lawrence River (, ) is a large international river in the middle latitudes of North America connecting the Great Lakes to the North Atlantic Ocean. Its waters flow in a northeasterly direction from Lake Ontario to the Gulf of St. Lawrence, traversing Ontario and Quebec in Canada and New York (state), New York in the United States. A section of the river demarcates the Canada–United States border, Canada–U.S. border. As the primary Discharge (hydrology), drainage outflow of the Great Lakes Basin, the St. Lawrence has the List of rivers by discharge, second-highest discharge of any river in North America (after the Mississippi River) and the 16th-highest in the world. The estuary of St. Lawrence, estuary of the St. Lawrence is often cited by scientists as the largest in the world. Significant natural landmarks of the river and estuary include the 1,864 river islands of the Thousand Islands, the endangered whales of Saguenay–St. Lawrence Marine Park, and the limestone ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Albany, New York
Albany ( ) is the List of capitals in the United States, capital city of the U.S. state of New York (state), New York. It is located on the west bank of the Hudson River, about south of its confluence with the Mohawk River. Albany is the oldest city in New York, and the county seat of and most populous city in Albany County, New York, Albany County. Albany's population was 99,224 at the 2020 United States census, 2020 census and estimated at 101,228 in 2023. The city is the economic and cultural core of New York State's Capital District (New York), Capital District, a metropolitan area including the nearby cities and suburbs of Colonie, New York, Colonie, Troy, New York, Troy, Schenectady, New York, Schenectady, and Saratoga Springs, New York, Saratoga Springs. With a population of 1.23 million in 2020, the Capital District is the third-most populous metropolitan region in the state. The Hudson River area was originally inhabited by Algonquian languages, Algonquian-speaking Mo ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
New Jersey
New Jersey is a U.S. state, state located in both the Mid-Atlantic States, Mid-Atlantic and Northeastern United States, Northeastern regions of the United States. Located at the geographic hub of the urban area, heavily urbanized Northeast megalopolis, it is bordered to the northwest, north, and northeast by New York (state), New York State; on its east, southeast, and south by the Atlantic Ocean; on its west by the Delaware River and Pennsylvania; and on its southwest by Delaware Bay and Delaware. At , New Jersey is the List of U.S. states and territories by area, fifth-smallest state in land area. According to a 2024 United States Census Bureau, U.S. Census Bureau estimate, it is the List of U.S. states and territories by population, 11th-most populous state, with over 9.5 million residents, its highest estimated count ever. The state capital is Trenton, New Jersey, Trenton, and the state's most populous city is Newark, New Jersey, Newark. New Jersey is the only U.S. stat ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
River
A river is a natural stream of fresh water that flows on land or inside Subterranean river, caves towards another body of water at a lower elevation, such as an ocean, lake, or another river. A river may run dry before reaching the end of its course if it runs out of water, or only flow during certain seasons. Rivers are regulated by the water cycle, the processes by which water moves around the Earth. Water first enters rivers through precipitation, whether from rainfall, the Runoff (hydrology), runoff of water down a slope, the melting of glaciers or snow, or seepage from aquifers beneath the surface of the Earth. Rivers flow in channeled watercourses and merge in confluences to form drainage basins, or catchments, areas where surface water eventually flows to a common outlet. Rivers have a great effect on the landscape around them. They may regularly overflow their Bank (geography), banks and flood the surrounding area, spreading nutrients to the surrounding area. Sedime ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Ordnance Survey
The Ordnance Survey (OS) is the national mapping agency for Great Britain. The agency's name indicates its original military purpose (see Artillery, ordnance and surveying), which was to map Scotland in the wake of the Jacobite rising of 1745. There was also a more general and nationwide need in light of the potential threat of invasion during the Napoleonic Wars. Since 1 April 2015, the Ordnance Survey has operated as Ordnance Survey Ltd, a state-owned enterprise, government-owned company, 100% in public ownership. The Ordnance Survey Board remains accountable to the Secretary of State for Science, Innovation and Technology. It was also a member of the Public Data Group. Paper maps represent only 5% of the company's annual revenue. It produces digital map data, online route planning and sharing services and mobile apps, plus many other location-based products for business, government and consumers. Ordnance Survey mapping is usually classified as either "Scale (map), lar ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
