Thalweg

In geography and fluvial geomorphology, a thalweg or talweg (/ˈtɑːlvɛɡ/) is the line of lowest elevation within a valley or watercourse. Under international law, thalwegs can acquire special significance because disputed river borders are often deemed to run along the river's thalweg.

The word is of 19th-century German origin. The German word Thalweg (modern spelling ) is a compound noun that is built from the German elements Thal (since Duden's orthography reform of 1901 written Tal) meaning valley, and Weg, meaning way. It literally means "valley way" and is used, with its modern spelling "Talweg," in daily German to describe a path or road that follows the bottom of a valley, or in geography with the more technical meaning also adopted by English.

In hydrological and fluvial landforms, the thalweg is a line drawn to join the lowest points along the entire length of a stream bed or valley in its downward slope, defining its deepest channel. The thalweg thus marks the natural direction (the profile) of a watercourse.

The term is also sometimes used to refer to a subterranean stream that percolates under the surface and in the same general direction as the surface stream.

Slowing stream bed erosion by taking advantage of a thalweg helps stabilize running water sources. Placing boulders along the thalweg in a running water source helps to protect the channel's sedimentary erosion and deposit balance. In concurrence with the placement of boulders along a thalweg, the placement of boulders along an instream to form man-made sills also helps to slow the sedimentary erosion and deposit of running water sources, while keeping the esteem (fishing, local wildlife, and recreation) and natural resources of the running water source intact. The placement of boulders along a thalweg and the creation of instream sills help to aid the flow of water during late summer months when the flow rate drops, and helps to slow sedimentary erosion and deposit in the spring and fall months when the flow rates are high. This process of utilizing a thalweg to slow stream bed erosion was used in Meacham Creek in Umatilla, Oregon.

...
Wikipedia