Penck’s erosion cycle
According to Penck, “The phase and rate of upliftment of landforms and the sum of mutual relations in degradation are said.” Mr. Penck has addressed the upliftment at different rates. He has divided the stages of evolution of landforms into three parts, which are as follows-
- Afasti Jinde Intiwak Lung – In this, the topography uplifts rapidly. So this is the first stage.
Gleikhpharming Intivac Lung – In this, upliftment starts at a uniform speed. Hence it is named the middle stage.
Anbasti Jinde Intiwak Lung – The rate of regeneration decreases in this. This is shown by the last condition.
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This erosion cycle of Penck sir starts initially with upliftment and for some time in 2022, the upliftment ends. But the process of erosion continues till the end. Mr. Pack has revealed the erosion in the following five situations – Graphical representation of the erosion cycle of pack
Mr. Pac has shown this erosion cycle by two curves by drawing on the graph. In both of these, the upper and maximum mean height and the lower curve cross the minimum mean height. In this picture, the baseline has been displayed with time and the vertical line has been displayed with height. The condition of the entire Rekhachakra has been described in five stages 394. These five stages reveal the conditions of development of the relief. The five stages of throwing are as follows-
First stage- In this stage both upliftment and erosion go on simultaneously. However, in this stage, the uplift is more because the valley is deeper. Due to the uplift, the doabs between the rivers become flat. In this situation, erosion is less. That’s why doabs are rarely eroded. But even then there is a state of being flat.
Second stage: In this stage, uplift and erosion are predominant. Along with the uplift, the rate of erosion becomes so fast that the valleys start flattening quickly. The land in the doab of the rivers is shaped like mountains and the valleys also become low.
Although the uplift of the doab and the erosion of the valley take place in this stage, still the vertical erosion of the valley remains less as a result of the uplift and the difference between the deepening of the valley, the more slowly it rises, as a result of which the doab Its height (elevation) increases, but there is no significant change in its elevation.
the Third stage This stage is the stage of competition between uplift and erosion. Therefore, uplift is in a state of being more than erosion and erosion is more than uplift. As a result of the uplift, the higher regions do not rise above the average height, as well as the lower regions do not fall further. Therefore, there is no special difference between the process of uplift and erosion.
Fourth stage – In this stage, the speed of upliftment becomes very weak. The rate of erosion remains the same, but as the rate of uplift has slowed down, the rate of erosion appears to be higher. Due to erosion, the river valleys start getting deeper and there is a lot of difference in the condition of the surface. The land in the doab of the rivers becomes more low-lying due to erosion.
Fifth stage – This is the last stage of the erosion cycle of the throw. In this stage, along with the uplift, the rate of erosion also slows down. In the valleys of the rivers, hilly mounds become a raised pointed part and a rounded sunken part. Therefore, in this situation both height and depth decrease. In this situation, this state occurs in old age.