The channel roughness decreases because the water and little parts of rock in it will start to slowly smooth the surface under the water.
Decrease. The source of the river is usually in a mountainous area with a steep gradient.
Fine silt and mud are carried further downstream than heavier rocks and gravel. Which often results in muddy banks at the river mouth.
It doesn't decrease, it increases. It only apears to decrease because the lower course of a river is smoother. Because of waterfalls etc in the upper course, it appears to be going quicker when actually obstructions, although creating a splash, decrease spped.
Energy is lost along a river's course through friction with the riverbed and banks, as well as through turbulence and drag caused by obstacles like rocks and vegetation. Energy can also be lost through heat transfer to the surrounding environment. Overall, these factors contribute to the gradual decrease in the river's flow velocity and energy as it travels downstream.
Downstream. The source of a river is always upstream.
the mouth of the river.?
Water moving in all directions, without a clear downstream direction, is called turbulence. Turbulence occurs when the flow of water is chaotic and unpredictable, often caused by the interaction of various currents, obstacles, or changes in depth.
You should position your feet facing downstream if you have capsized and are floating on your back in a swift river current.
No, a river only flows one way, they either flow upstream or downstream not both.
erosion :P
You are going with the flow of the river
The size of the pebble will decrease down stream because the further downstream you go the quicker the river velocity. This means there will be more abrasion against the sides and bed of the river and the friction will be greater, this wears away the river load making it decrease in size. Increase velocity means that bigger material will be picked up by the river and carried as river load. More load in the river and increased size of load will mean more attrition and the river load will keep colliding into each other smoothening and rounding their shape. Brap brap !!