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.
What is the thalweg in a river?
1a : a line following the lowest part of a valley whether under water or not. b : the line of continuous maximum descent from any point on a land surface or one crossing all contour lines at right angles. c : subsurface water percolating beneath and in the same direction as a surface stream course.
Is the thalweg the fastest flow?
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 is almost always the line of fastest flow in any river.
What is the boundary of a river called?
The boundary of a river basin is called the watershed. A drowned river valley in a coastal lowland area. Occurs near or at the mouth of a river, where the tide meets the current and the fresh and salt waters mix.
What is the deepest part of a stream?
Characteristics of Streams The deepest part of the channel, the route taken by the last (or first) bit of water, is called the thalweg (TALL-vegg, from the German for “valley way”). The sides of the channel, along the edges of the stream, are its banks.
What is the thalweg principle?
The Thalweg principle states that river boundaries between two states may be, if the two states agree, divided by the mid-channel. If the boundary line is demarcated as per the Thalweg principle, Pakistan stands to lose a substantial share of the territory that was historically part of the province of Sindh.
What is the fastest part of a river called?
Rapids are sections of a river where the river bed has a relatively steep gradient, causing an increase in water velocity and turbulence. Rapids are hydrological features between a run (a smoothly flowing part of a stream) and a cascade.
What is the line of fastest flow in a river called?
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.
What is the smallest type of stream?
Streams smaller than rivers, roughly in order of size, may be called branches or forks, creeks, brooks, runnels, and rivulets. The very smallest kind of stream, just a trickle, is a rill.
What makes a stream healthy?
A healthy stream is one that supports various native species of insects, crustaceans, and fish. The ability to support these species depends both on water quality and habitat availability.
What is a fluvial geomorphologist?
Fluvial geomorphology is the study of the interactions between the physical shapes of rivers, their water and sediment transport processes, and the landforms they create. Rivers include sediment and debris as well as water; and as they flow, they apply force on, and release material to, the landscapes around them.
Which is the best definition of the thalweg?
Definition of thalweg. 1a : a line following the lowest part of a valley whether under water or not. b : the line of continuous maximum descent from any point on a land surface or one crossing all contour lines at right angles.
How big is the thalweg channel in feet?
The channel is bound by depositional levees; the northern levee is especially well developed into a ridge. A secondary thalweg channel, about 40 m deep and 400 m wide, meanders across the broad channel floor. Another, similar, thalweg channel can be distinguished close to the northern flank of the lower Nazaré Canyon ( Figure 50.2 D and E).
How are thalwegs related to the locus of t = 0?
Theoretically, ridges and convex break lines relate to the locus of T = 0 within divergence areas, while thalwegs and concave break lines correspond to the locus of T = 0 within convergence areas ( Shary and Stepanov, 1991 ). Fig. 4.15 illustrates the revealing of crest and thalweg lines using the generating function.
What are the bedforms of the thalweg floor?
Thalweg floor: The Nazaré thalweg floor is formed by the bottom of the V-shaped valley in the upper canyon and continues as secondary thalweg channel further down. ROV video data and high-resolution bathymetry show a variety of bedforms ranging from ripples to sand waves and comet scours around boulders ( Figures 50.2 and 50.4H ).