What does a knickpoint indicate on a river profile?
A knickpoint is defined as a steep region along a river profile and can vary in form from a single waterfall to a high-gradient region extending for many kilometers.
How are Knickpoints formed?
Knickpoints are small waterfalls found in the lower course of a river. They occur at the point where the river once entered the sea. Due to isostatic uplift the sea level was lowered and the river had to now travel a longer distance to reach the sea.
What is the knickpoint quizlet?
The knickpoint is where the old long profile joins the new. Receding upstream can form prominent outcrops. What is the rate of knickpoints receding dependent on?
What causes a river to become rejuvenated?
A Rejuvenated River, one with a gradient that is raised by the earth’s movement, can be an old age river that returns to a Youthful State, and which repeats the cycle of stages once again. A brief overview of each stage of river development begins after the images.
How is the rate of knickpoint migration modelled?
Knickpoint propagation is typically modelled with the semi empirical stream power law where the drainage basin size is used as a proxy for discharge, which in turn has a positive nonlinear correlation to the rate of knickpoint migration. Both analytical and numerical solutions have been proposed to solve the stream power law .
Which is an example of a Knick point formation?
Formation. Knickpoints are formed by the influence of tectonics, climate history, and/or lithology. For example, uplift along a fault over which a river is flowing will often result in an unusually steep reach along a channel, known as a knickzone. Glaciation resulting in a hanging valley are often prime spots for knickpoints.
Where does the incision of a knickpoint begin?
This incision begins at the formation of a knickpoint, and its upstream migration depends heavily upon the drainage area (and so the discharge of the river), material through which it cuts, and how large the drop in base level was.
What is the difference between a knickzone and a stationary Knick point?
The knickpoint is the distinct inflection point between a knickzone and an upstream, lower gradient reach (Seidl and Dietrich, 1992; Wobus et al., 2006; Crosby and Whipple, 2006 ). In addition to transient knickpoints, there are also stationary knickpoints, where an erosionally resistant substrate in the channel locally impedes incision.