a cross sectional view of a stream from its source, or head waters, to its mouth the point downstream where the river empties into another body of water.
nickpoint
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I would say the waterfall and the rapids are the most prominent features of a narrow V - Shaped valley where the stream profile drops rapidly.
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Some prominent features of a narrow V-shaped valley with a stream profile that drops rapidly include steep, rocky walls, minimal vegetation due to the harsh environment, a high-gradient stream flowing through the valley, and the potential for waterfalls and cascades as the stream descends quickly.
Hi
Incised meanders: Entrenched meanders that indicate a stream has downcut into its bed, often resulting in a deep, narrow channel. Knickpoints: Sudden changes in slope along a stream profile that indicate a shift in base level and rejuvenation of the stream system.
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A section of stream from one bank to the other is commonly referred to as a "cross-section" of the stream. This term is used in hydrology and geology to describe the lateral profile of the stream, illustrating its depth, width, and shape at a specific point. It helps in understanding flow dynamics and sediment transport within the stream.
The most prominent features of a narrow V-shaped valley with a rapidly dropping stream profile are steep valley walls, narrow width of the valley bottom, and a pronounced V shape that indicates erosion by the stream. These valleys often exhibit vertical erosion and can be associated with fast-flowing water and a high energy environment.