题目内容
The base level is the termination of vertical erosion, it is the elevation at which a river enters a large standing body of water, such as a lake or ocean.
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The delta is typically built by three kinds of beds, topset beds, forest beds and bottomset bed.
The types of sedimentary bodies in rivers include:
Hjulstrom diagram discussed the relationship between particle size and the velocity of water, resulting in deposition and erosion. It tells us that to overcome the coherence of grains the water transports condensed particles with higher speed than it doesethe loose ones.
A river is always keeping its dynamic equilibrium. When the river loses its equilibrium because of changes in velocity and other reasons, the river will change its competence and capacity to seek a new equilibrium, resulting in deposition or erosion.
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