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The thalweg of a river. In geography, hydrography, and fluvial geomorphology, a thalweg or talweg (/ ˈ t ɑː l v ɛ ɡ /) is the line or curve of lowest elevation within a valley or watercourse. [1] Its vertical position in maps is the nadir (greatest depth, sounding) in the stream profile.
The line of maximum depth, or channel, is the thalweg or thalweg line. It is typically designated the borderline when rivers are used as political borders. The thalweg hugs the outer banks and returns to center over the riffles. The meander arc length is the distance along the thalweg over one meander. The river length is the length along the ...
The Nazaré Canyon off the coast of Portugal. The Nazaré Canyon is a submarine canyon just off the coast of Nazaré, portuguese Oeste region, in the eastern North Atlantic Ocean. It is the largest submarine canyon in Europe, [1] reaching depths of about 5,000 metres (16,000 ft) deep and a length of about 230 kilometres (140 mi). [2]
The thalweg legal principle states that if the border between two political entities is stated to be a waterway without further description (e.g. a median line, right bank, eastern shore, low tide line, etc.), the boundary follows the thalweg of that watercourse; in particular, the boundary follows the center of the principal navigable channel ...
The Twelve-Mile Circle is, however, the only circular U.S. state boundary. [6] Its existence dates back to 1681, when King Charles II granted a deed to William Penn north of the already chartered Maryland. Charles created an exception, consisting of 12 miles around New Castle and extending down the peninsula, since these lands were held by the ...
In these cases, scientists realized that the riverbed often tends to rise and fall with distance downstream relative to an average elevation of the river's slope. That led scientists to map the bed elevation down the deepest path in a channel, called the thalweg, to obtain a longitudinal profile. Then, the piecewise linear slope of the river is ...
River boundaries are typically defined by the "thread of the channel" (the river's thalweg, usually in the approximate middle of the river's channel), under a rule that the United States inherited from England, where it applies to boundaries between counties.
Fairway and navigable channel. The term "fairway" usually means all the navigable waters between the fairway buoys (that indicate the ends of the channel), even the routes only accessible to the lighter-draft vessels. [1] Some authors restrict the definition to the linear approach part of a marine waterway, the approach channel leading into a port.