Updated By: LatestGKGS Desk
Geography: Rejuvenation in landscape , their types and causes
Geography: The factors causing rejuvenation in landscape and describe the resultant landform.
Rejuvenation lengthens the period of the cycle of erosion. For example, if the cycle of erosion is passing through the senile stage (old stage) characterized by gentle channel gradient.
Rejuvenation is of three types:
1. Dynamic rejuvenation:
Causes:
(i) Upliftment in the landmass.
(ii) Tilting of land area.
(iii) Lowering the outlet.
2. Eustatic rejuvenation:
Causes:
(i) Diastrophic events (subsidence of seafloor or rise of coastal land).
(ii) Glaciation causing fall in sea level.
3. Static rejuvenation:
Causes:
(i) The decrease in the river load.
(ii) Increase in the volume of water and consequent stream discharge due to increased rainfall or melt-water.
(iii) Increase in water volume of the main river due to river capture.
The Damodar valley at Rajroppa in Hazaribagh (Jharkhand) is a typical example of the polycyclic valley or topographic discordance which is characterized by a two-storeyed valley. The Damodar River developed its broad and flat valley of the senile stage before the onset of Tertiary upliftment.
