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Some of the changes suffered by the rivers

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Some of the changes suffered by the rivers:
Probably a lot of things happen to the rivers after they have emerged and began to cut off valleys. Where rivers are trying to reach rock solid roots level, or some of them are exposed to the state of the river families or become soaked parts of the valleys. It also refrigerators icy streams by changing some of the rivers, and close landslides and volcanic eruptions some river valleys where lakes form behind them or you change downstream. And it happens to cut off the source of water that feeds the river by land or as a result of the discharge of water some rivers movements and put obstacles in the valleys and prevent the normal development of her. We will discuss in some of those cases, the job comes with:

1. grassroots level: Base Level
    Before we get into the details of the study Algiomorvih shapes formed by the rivers we must know a very important concept, namely the grassroots level of the river erosion. And we mean the level at which all the tributaries of the river trying to be all hip actors to convey through his work in the erosion and sedimentation. There are two levels of the base two-level al-Qaida, which is permanent in many cases, such as the emergence of rock layers more solid somewhere in the course of the river, and the level of a temporary base is in the level of the solid rock layers themselves for the department actually above the river downstream. The same thing happens if the river flows into the lake where the lake is considered temporary roots level for the department actually above the river. Bottoms interior basins temporary base of the rivers, which ends where levels were also considered. As for why this was considered a temporary levels, it is because the rivers can work in continuous deepening and valleys in some cases, or by sedimentation processes in other cases to eliminate those conditions that formed the base level of temporary and due to the second-Qaeda permanent level.
   Each a river aims to form a sector in a curved balanced with the grassroots so that increasingly high that the curve of river The closer to the upper river basin and its resources and decreasing the height of the curve from the grassroots level as we get closer to the place where the ends of the river or the place that represents the foundation for high-roots level . This means that on the river to accelerate the deepening of its valley in areas that have high, where much of the grass-roots level and should also slow down the process in the lower parts of the nearby river valley in the height of the grass-roots level. This idea shows us how the river has to draw most of its energy in the vertical sculpture process and deepen its valley in the high mountain areas and that he should direct his energy in low-lying areas to expand this valley rather than deepen it. And even it forced the river sometimes even to raise the level of the bottom of the valley during the deposition process in order to slow down the process of deepening and thus can both parts of the valley to reach the grassroots level in almost simultaneously. And we are balanced graded the river if he could theoretically have a curve corresponds to the amount of current the water and the amount of the load borne so that he does not attempt to take any of the stripping process and at the same time does not attempt to deposit a bit of a load borne. Thus, the energy that stores them balanced the river with the work being done be transferred to a load only.

2. River families Capture Stream
      River families process occurs when one of the rivers to take over all or part of the headwaters of the river another nearby so extensive drainage area on the river basin that account. And it gets the result of multiple conditions to be vertical sculpture process to a river valley faster than the vertical sculpture process to another river which leads to an increase in the length of this valley toward the headwaters. This process is known as regressive sculpting process. It can be a reason for families to increase the degree of slope relative to one other rivers, followed by an increase in the speed of the flow of this river, thus increasing the deepening of Oade process, and such a situation occur when too much stems from a river down a mountain rims.