On Selasa, 13 November 2012
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River systems eroded landscape through three processes, namely (1) the
transfer of regolith (rock fragments and layers of unconsolidated rock in the
earth's surface), (2) an erosion (downcutting) river channel through abrasion,
and (3) erosion upstream direction (headward erosion)
Regolith removal process is a simple process that is important pengerosian that move and carry soil and rock debris (rock debris) produced during weathering. When the material is readily soluble it will be carried away by the leaching process.
Grinding is a fundamental erosion processes on all river channel. The process is accompanied by the canal bottom abrasion by sand and gravel when mengerus in flowing water. Mineral abrasion such as garnet, corundum or quartz dragged while grinding and cutting rock with incredible speed (Figure 8).
It draws from the erosion of basic channels are drilling action by the pebbles and gravel trapped in depression and eddies. Rotational movement of sand, gravel and boulders like a drill and make a hole in known as the Potholes (Figure 7.9).
Figure 8. Sand and gravel can be an erosion and contribute strongly mengabrasi when tertransport by sungai.Grand Canyon, Arizona (Hamblin & Christiansen, 1995). Figure 9. Potholes are tererosinya riverbed by sand, pebbles and gravel were rotated because the eddy's current. Potholes from side to side about 10 meters (Hamblin & Christiansen, 1995).
Another important factor is the erosion of the river channel migration upstream direction (upstream migration) from the waterfall (waterfalls). When the water dropping velocity increases, the turbulence at the base of airterjun be large so fast erosion at the cliff wall and was finally able to make airterjun backward toward the upstream (Figure 10).
Figure 10. Niagara Falls experienced withdrawals upstream direction. It occurs as a hydraulic action that cuts at the bottom of the limestone shale. Experience towards the waterfall upstream migration speeds average of 1.3 m / year (Hamblin & Christiansen, 1995).
In the process of erosion and basin evolution of the river has a tendency to erode the upstream direction and increase the length of the valley up to divide. Towards upstream erosion occurs because there is a relationship between the valley and the regional slope. The addition of water volume and velocity to erode the canal water upstream faster then retreated towards the wall of the valley. Thus, the upper part of the valley into the upper reaches of the expanded.
Regolith removal process is a simple process that is important pengerosian that move and carry soil and rock debris (rock debris) produced during weathering. When the material is readily soluble it will be carried away by the leaching process.
Grinding is a fundamental erosion processes on all river channel. The process is accompanied by the canal bottom abrasion by sand and gravel when mengerus in flowing water. Mineral abrasion such as garnet, corundum or quartz dragged while grinding and cutting rock with incredible speed (Figure 8).
It draws from the erosion of basic channels are drilling action by the pebbles and gravel trapped in depression and eddies. Rotational movement of sand, gravel and boulders like a drill and make a hole in known as the Potholes (Figure 7.9).
Figure 8. Sand and gravel can be an erosion and contribute strongly mengabrasi when tertransport by sungai.Grand Canyon, Arizona (Hamblin & Christiansen, 1995). Figure 9. Potholes are tererosinya riverbed by sand, pebbles and gravel were rotated because the eddy's current. Potholes from side to side about 10 meters (Hamblin & Christiansen, 1995).
Another important factor is the erosion of the river channel migration upstream direction (upstream migration) from the waterfall (waterfalls). When the water dropping velocity increases, the turbulence at the base of airterjun be large so fast erosion at the cliff wall and was finally able to make airterjun backward toward the upstream (Figure 10).
Figure 10. Niagara Falls experienced withdrawals upstream direction. It occurs as a hydraulic action that cuts at the bottom of the limestone shale. Experience towards the waterfall upstream migration speeds average of 1.3 m / year (Hamblin & Christiansen, 1995).
In the process of erosion and basin evolution of the river has a tendency to erode the upstream direction and increase the length of the valley up to divide. Towards upstream erosion occurs because there is a relationship between the valley and the regional slope. The addition of water volume and velocity to erode the canal water upstream faster then retreated towards the wall of the valley. Thus, the upper part of the valley into the upper reaches of the expanded.
