How deep it is and how fast it is going downhill that can also affect it
Factors that affect a river's ability to erode and carry sediment include velocity of the water flow, volume of water, slope of the riverbed, geology of the surrounding area, and the presence of vegetation or obstructions along the river's path. High velocity and volume of water, steep slopes, soft rock formations, and minimal vegetation can increase erosion and sediment transport capacity.
looseness of sediment, speed of wave, angle of wae on sediment, angle of beach floor (as that changes the waves suction angle height and strength)
A river's slope, volume of flow, and the shape of its streambed all affect how fast the river flows and how much sediment it can erode.
Faster flowing water has more energy, which increases its ability to erode. The kinetic energy of the water particles allows them to pick up and transport sediment more effectively, leading to greater erosion. Conversely, slower flowing water has less erosive power.
Streams erode sediment primarily during times of high flow or flood events when the velocity and volume of water are increased. The force of the water helps carry and transport sediment downstream, causing erosion along the streambed and banks. Wind and ice can also contribute to sediment erosion in streams.
The ability of a stream to erode and transport material largely depends on its discharge, velocity, gradient, and the size and shape of the sediments. These factors influence how much sediment a stream can carry and how effectively it can erode material from its surroundings.
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The amount of water in the stream and the gradient. However if you had two streams both with the same amount of water in them but with one stream flowing down a steeper slope (gradient) than the other, then the steep one has more ability to erode.
Gravity influences a stream's ability to erode materials by pulling them downstream. The force of gravity helps water to carry sediment and erode the streambed. Additionally, gravity plays a role in the deposition of materials by causing sediment to settle out of the water when the stream's velocity decreases.
Type of land surface, speed and volume of water.
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The major factor that determines a stream's ability to erode land is the stream's velocity. Higher velocity streams have more energy and can pick up and transport larger sediment particles, leading to more erosion. Additionally, the volume of water in the stream and the presence of steep gradients can also influence erosion.