The Namoi River's Geomorphic History

GEOS 2116/2916: Earth Surface Processes
Week 4 Practical: Channel Processes
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GEOS 2116/2916: Earth Surface Processes
Question 1: What does the long river profile of the Namoi River tell you about its geomorphic history? For example, is there any evidence for rejuvenation in this long profile?
Answer
The long profile of the Namoi River displays the channel slope of the river along with the entire course. Ideally, the upper part of the long profile of river Namoi indicates the level of turbulence and many bed load compared to the amount of discharge, showing that the river has undergone a high amount of fiction and discharge. Evidently, river Namoi drains towards the westward side of Murray Darling River Basin, extending by rising towards the New England Fold Belt and Eastern sides westwards slope. The river has been active since at least Middle Miocene (circa 14-10 million years back). The river has undergone rejuvenation, as evident from the number of changes the landscape has undergone. For instance, the Namoi contains formations induced by meanders, river terraces, knick points, rapids, and waterfalls. Rejuvenated rivers terrain normally contains complex landscapes since old landforms are usually preserved (Fuentes & Vervoort 2020). According to geomorphology principles, the river Namoi rejuvenated since it erodes at the landscape due to the lowering level at the base. Normally, the process results from the sudden rise of land or a fall in the sea level. The disturbance allows a rise in the potential energy of the river with an increase in the riverbed erosion. The erosion happens due to the river adjusting towards the new base level.
Figure 1: River Namoi. Source: /water/cewo/catchment/namoi
Question 2: Describe and account for the differences between these two channel cross-sections.
Answer
Historically, Naimoi is an old river with a long account of enormous Tertiary aged palaeo valley, which is comprised of 120 meters of alluvium. The present river system lies towards the southern side of the previous course leaving behind a series of palaeo channels abandoned towards the Quaternary age (Jain, 2018). The river is like any other internally drained semi-arid river from the discharge of eastern Australia Rivers inferred from the plan-for...